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<a href="allreduce__sockets_8cc.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">Copyright (c) by respective owners including Yahoo!, Microsoft, and</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">individual contributors. All rights reserved. Released under a BSD (revised)</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">license as described in the file LICENSE.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> */</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">/*</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">This implements the allreduce function of MPI. Code primarily by</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">Alekh Agarwal and John Langford, with help Olivier Chapelle.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> */</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <iostream></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <sstream></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <cstdio></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include <cmath></span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <ctime></span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <errno.h></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <string.h></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <stdlib.h></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#ifdef _WIN32</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#define NOMINMAX</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <WinSock2.h></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <Windows.h></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <WS2tcpip.h></span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <io.h></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <unistd.h></span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <arpa/inet.h></span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <sys/timeb.h></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include "<a class="code" href="allreduce_8h.html">allreduce.h</a>"</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include "<a class="code" href="vw__exception_8h.html">vw_exception.h</a>"</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">using</span> std::cerr;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">using</span> std::endl;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// port is already in network order</span></div><div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="classAllReduceSockets.html#a2552ae966284c09df115b89332e5c853"> 36</a></span> <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> <a class="code" href="classAllReduceSockets.html#a2552ae966284c09df115b89332e5c853">AllReduceSockets::sock_connect</a>(<span class="keyword">const</span> uint32_t ip, <span class="keyword">const</span> <span class="keywordtype">int</span> port)</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> sock = socket(PF_INET, SOCK_STREAM, 0);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (sock == -1)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"socket"</span>);</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  sockaddr_in far_end;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  far_end.sin_family = AF_INET;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  far_end.sin_port = <a class="code" href="classAllReduceSockets.html#a1ba0231ca299faf8894fe40bd19855ae">port</a>;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  far_end.sin_addr = *(in_addr*)&ip;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  memset(&far_end.sin_zero, <span class="charliteral">'\0'</span>, 8);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">char</span> dotted_quad[INET_ADDRSTRLEN];</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span> (<span class="keyword">nullptr</span> == inet_ntop(AF_INET, &(far_end.sin_addr), dotted_quad, INET_ADDRSTRLEN))</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"inet_ntop"</span>);</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">char</span> hostname[NI_MAXHOST];</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">char</span> servInfo[NI_MAXSERV];</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (getnameinfo((sockaddr*)&far_end, <span class="keyword">sizeof</span>(sockaddr), hostname, NI_MAXHOST, servInfo, NI_MAXSERV, NI_NUMERICSERV))</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"getnameinfo("</span> << dotted_quad << <span class="stringliteral">")"</span>);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  cerr << <span class="stringliteral">"connecting to "</span> << dotted_quad << <span class="stringliteral">" = "</span> << hostname << <span class="charliteral">':'</span> << ntohs(port) << endl;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">size_t</span> count = 0;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">int</span> ret;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">while</span> ((ret = connect(sock, (sockaddr*)&far_end, <span class="keyword">sizeof</span>(far_end))) == -1 && count < 100)</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  count++;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  std::stringstream msg;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  {</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  msg << <span class="stringliteral">"connect attempt "</span> << count << <span class="stringliteral">" failed: "</span> << strerror(errno);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  cerr << msg.str() << endl;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor">#ifdef _WIN32</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  Sleep(1);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  sleep(1);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (ret == -1)</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"cannot connect"</span>);</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> sock;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div><div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="classAllReduceSockets.html#af60b694a59620607b5fc41fa29bcf63a"> 85</a></span> <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> <a class="code" href="classAllReduceSockets.html#af60b694a59620607b5fc41fa29bcf63a">AllReduceSockets::getsock</a>()</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> sock = socket(PF_INET, SOCK_STREAM, 0);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (sock < 0)</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"socket"</span>);</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// SO_REUSEADDR will allow port rebinding on Windows, causing multiple instances</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// of VW on the same machine to potentially contact the wrong tree node.</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor">#ifndef _WIN32</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">int</span> on = 1;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (<span class="keywordtype">char</span>*)&on, <span class="keyword">sizeof</span>(on)) < 0)</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  {</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  cerr << <span class="stringliteral">"setsockopt SO_REUSEADDR: "</span> << strerror(errno) << endl;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// Enable TCP Keep Alive to prevent socket leaks</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">int</span> enableTKA = 1;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span> (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (<span class="keywordtype">char</span>*)&enableTKA, <span class="keyword">sizeof</span>(enableTKA)) < 0)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  {</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  cerr << <span class="stringliteral">"setsockopt SO_KEEPALIVE: "</span> << strerror(errno) << endl;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> sock;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> }</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"><a class="line" href="classAllReduceSockets.html#a8526b19d5848d6845dd2e96afdf879ac"> 113</a></span> <span class="keywordtype">void</span> <a class="code" href="classAllReduceSockets.html#a8526b19d5848d6845dd2e96afdf879ac">AllReduceSockets::all_reduce_init</a>()</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="preprocessor">#ifdef _WIN32</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  WSAData wsaData;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">int</span> lastError = WSAStartup(MAKEWORD(2, 2), &wsaData);</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span> (lastError != 0)</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"WSAStartup() returned error:"</span> << lastError);</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keyword">struct </span>hostent* master = gethostbyname(<a class="code" href="classAllReduceSockets.html#a9b3d7b4b0c70efa1552f3093e8de1068">span_server</a>.c_str());</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (master == <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"gethostbyname("</span> << <a class="code" href="classAllReduceSockets.html#a9b3d7b4b0c70efa1552f3093e8de1068">span_server</a> << <span class="stringliteral">")"</span>);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a8cad0619d240dff1372e89eedb2211ff">current_master</a> = <a class="code" href="classAllReduceSockets.html#a9b3d7b4b0c70efa1552f3093e8de1068">span_server</a>;</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  uint32_t master_ip = *((uint32_t*)master->h_addr);</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> master_sock = <a class="code" href="classAllReduceSockets.html#a2552ae966284c09df115b89332e5c853">sock_connect</a>(master_ip, htons(<a class="code" href="classAllReduceSockets.html#a1ba0231ca299faf8894fe40bd19855ae">port</a>));</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">if</span> (send(master_sock, (<span class="keyword">const</span> <span class="keywordtype">char</span>*)&<a class="code" href="classAllReduceSockets.html#ad365b9d51ebb080a25ec97b8c4952889">unique_id</a>, <span class="keyword">sizeof</span>(unique_id), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(unique_id))</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  {</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"write unique_id="</span> << unique_id << <span class="stringliteral">" to span server failed"</span>);</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  cerr << <span class="stringliteral">"wrote unique_id="</span> << unique_id << endl;</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">if</span> (send(master_sock, (<span class="keyword">const</span> <span class="keywordtype">char</span>*)&<a class="code" href="classAllReduce.html#a4ab695c1c631c3db42936d03733db9e0">total</a>, <span class="keyword">sizeof</span>(total), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(total))</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  {</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"write total="</span> << total << <span class="stringliteral">" to span server failed"</span>);</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  }</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  {</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  cerr << <span class="stringliteral">"wrote total="</span> << total << endl;</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (send(master_sock, (<span class="keywordtype">char</span>*)&<a class="code" href="structnode.html">node</a>, <span class="keyword">sizeof</span>(node), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(node))</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  {</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"write node="</span> << node << <span class="stringliteral">" to span server failed"</span>);</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  {</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  cerr << <span class="stringliteral">"wrote node="</span> << node << endl;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  }</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordtype">int</span> ok;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span> (recv(master_sock, (<span class="keywordtype">char</span>*)&ok, <span class="keyword">sizeof</span>(ok), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(ok))</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  {</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"read ok from span server failed"</span>);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  }</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  {</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  cerr << <span class="stringliteral">"read ok="</span> << ok << endl;</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  }</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (!ok)</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"mapper already connected"</span>);</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  uint16_t kid_count;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  uint16_t parent_port;</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  uint32_t parent_ip;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">if</span> (recv(master_sock, (<span class="keywordtype">char</span>*)&kid_count, <span class="keyword">sizeof</span>(kid_count), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(kid_count))</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  {</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"read kid_count from span server failed"</span>);</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  {</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  cerr << <span class="stringliteral">"read kid_count="</span> << kid_count << endl;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  }</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> sock = -1;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordtype">short</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> netport = htons(26544);</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (kid_count > 0)</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  sock = <a class="code" href="classAllReduceSockets.html#af60b694a59620607b5fc41fa29bcf63a">getsock</a>();</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  sockaddr_in address;</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  address.sin_family = AF_INET;</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  address.sin_addr.s_addr = htonl(INADDR_ANY);</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  address.sin_port = netport;</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordtype">bool</span> listening = <span class="keyword">false</span>;</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">while</span> (!listening)</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  {</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (::bind(sock, (sockaddr*)&address, <span class="keyword">sizeof</span>(address)) < 0)</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  {</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="preprocessor">#ifdef _WIN32</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (WSAGetLastError() == WSAEADDRINUSE)</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">if</span> (errno == EADDRINUSE)</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  {</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  netport = htons(ntohs(netport) + 1);</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  address.sin_port = netport;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"bind"</span>);</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">if</span> (listen(sock, kid_count) < 0)</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  {</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  cerr << <span class="stringliteral">"listen: "</span> << strerror(errno) << endl;</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <a class="code" href="allreduce_8h.html#a35da5532d470440b1afd69338e9053a8">CLOSESOCK</a>(sock);</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  sock = <a class="code" href="classAllReduceSockets.html#af60b694a59620607b5fc41fa29bcf63a">getsock</a>();</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  {</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  listening = <span class="keyword">true</span>;</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  }</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  }</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  }</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">if</span> (send(master_sock, (<span class="keyword">const</span> <span class="keywordtype">char</span>*)&netport, <span class="keyword">sizeof</span>(netport), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(netport))</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"write netport failed!"</span>);</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordflow">if</span> (recv(master_sock, (<span class="keywordtype">char</span>*)&parent_ip, <span class="keyword">sizeof</span>(parent_ip), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(parent_ip))</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  {</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"read parent_ip failed!"</span>);</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  }</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  {</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordtype">char</span> dotted_quad[INET_ADDRSTRLEN];</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="keywordflow">if</span> (<span class="keyword">nullptr</span> == inet_ntop(AF_INET, (<span class="keywordtype">char</span>*)&parent_ip, dotted_quad, INET_ADDRSTRLEN))</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  {</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  cerr << <span class="stringliteral">"read parent_ip="</span> << parent_ip << <span class="stringliteral">"(inet_ntop: "</span> << strerror(errno) << <span class="stringliteral">")"</span> << endl;</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  }</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  {</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  cerr << <span class="stringliteral">"read parent_ip="</span> << dotted_quad << endl;</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  }</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">if</span> (recv(master_sock, (<span class="keywordtype">char</span>*)&parent_port, <span class="keyword">sizeof</span>(parent_port), 0) < (<span class="keywordtype">int</span>)<span class="keyword">sizeof</span>(parent_port))</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  {</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"read parent_port failed!"</span>);</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  {</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">quiet</a>)</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  cerr << <span class="stringliteral">"read parent_port="</span> << parent_port << endl;</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <a class="code" href="allreduce_8h.html#a35da5532d470440b1afd69338e9053a8">CLOSESOCK</a>(master_sock);</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span> </div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">if</span> (parent_ip != (uint32_t)-1)</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  {</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">parent</a> = <a class="code" href="classAllReduceSockets.html#a2552ae966284c09df115b89332e5c853">sock_connect</a>(parent_ip, parent_port);</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  }</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">parent</a> = -1;</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[0] = -1;</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[1] = -1;</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < kid_count; i++)</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  {</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  sockaddr_in child_address;</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  socklen_t size = <span class="keyword">sizeof</span>(child_address);</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <a class="code" href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a> <a class="code" href="cache_8cc.html#af900396d7b72ff2a7002e8befe8cf8f1">f</a> = accept(sock, (sockaddr*)&child_address, &size);</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">if</span> (f < 0)</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <a class="code" href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a>(<span class="stringliteral">"accept"</span>);</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">// char hostname[NI_MAXHOST];</span></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="comment">// char servInfo[NI_MAXSERV];</span></div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">// getnameinfo((sockaddr *) &child_address, sizeof(sockaddr), hostname, NI_MAXHOST, servInfo, NI_MAXSERV,</span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="comment">// NI_NUMERICSERV); cerr << "connected to " << hostname << ':' << ntohs(port) << endl;</span></div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[i] = <a class="code" href="cache_8cc.html#af900396d7b72ff2a7002e8befe8cf8f1">f</a>;</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  }</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> (kid_count > 0)</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <a class="code" href="allreduce_8h.html#a35da5532d470440b1afd69338e9053a8">CLOSESOCK</a>(sock);</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> }</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div><div class="line"><a name="l00291"></a><span class="lineno"><a class="line" href="classAllReduceSockets.html#a345a963f2c0db12df34689612bb71de8"> 291</a></span> <span class="keywordtype">void</span> <a class="code" href="classAllReduceSockets.html#a345a963f2c0db12df34689612bb71de8">AllReduceSockets::pass_down</a>(<span class="keywordtype">char</span>* buffer, <span class="keyword">const</span> <span class="keywordtype">size_t</span> parent_read_pos, <span class="keywordtype">size_t</span>& children_sent_pos)</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span> {</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordtype">size_t</span> my_bufsize = std::min(<a class="code" href="allreduce_8h.html#ae5dbb7bf6624bc7ee3c1a40fec4452e4">ar_buf_size</a>, (parent_read_pos - children_sent_pos));</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">if</span> (my_bufsize > 0)</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  {</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="comment">// going to pass up this chunk of data to the children</span></div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">if</span> (<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[0] != -1 &&</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  send(<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[0], buffer + children_sent_pos, (<span class="keywordtype">int</span>)my_bufsize, 0) < (<span class="keywordtype">int</span>)my_bufsize)</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  {</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"Write to left child failed"</span>);</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  }</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">if</span> (<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[1] != -1 &&</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  send(<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[1], buffer + children_sent_pos, (<span class="keywordtype">int</span>)my_bufsize, 0) < (<span class="keywordtype">int</span>)my_bufsize)</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  {</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"Write to right child failed"</span>);</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  }</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  children_sent_pos += my_bufsize;</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  }</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> }</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div><div class="line"><a name="l00313"></a><span class="lineno"><a class="line" href="classAllReduceSockets.html#ae2b83b638e9352f6c166ad9df183389b"> 313</a></span> <span class="keywordtype">void</span> <a class="code" href="classAllReduceSockets.html#ae2b83b638e9352f6c166ad9df183389b">AllReduceSockets::broadcast</a>(<span class="keywordtype">char</span>* buffer, <span class="keyword">const</span> <span class="keywordtype">size_t</span> n)</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span> {</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordtype">size_t</span> parent_read_pos = 0; <span class="comment">// First unread float from parent</span></div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordtype">size_t</span> children_sent_pos = 0; <span class="comment">// First unsent float to children</span></div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="comment">// parent_sent_pos <= left_read_pos</span></div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="comment">// parent_sent_pos <= right_read_pos</span></div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keywordflow">if</span> (<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">parent</a> == -1)</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  {</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  parent_read_pos = n;</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  }</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">if</span> (<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[0] == -1 && <a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">children</a>[1] == -1)</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  children_sent_pos = n;</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span> </div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">while</span> (parent_read_pos < n || children_sent_pos < n)</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  {</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <a class="code" href="classAllReduceSockets.html#a345a963f2c0db12df34689612bb71de8">pass_down</a>(buffer, parent_read_pos, children_sent_pos);</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">if</span> (parent_read_pos >= n && children_sent_pos >= n)</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span> (<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">parent</a> != -1)</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  {</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="comment">// there is data to be read from the parent</span></div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordflow">if</span> (parent_read_pos == n)</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">"I think parent has no data to send but he thinks he has"</span>);</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordtype">size_t</span> count = std::min(<a class="code" href="allreduce_8h.html#ae5dbb7bf6624bc7ee3c1a40fec4452e4">ar_buf_size</a>, n - parent_read_pos);</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordtype">int</span> read_size = recv(<a class="code" href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">socks</a>.<a class="code" href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">parent</a>, buffer + parent_read_pos, (<span class="keywordtype">int</span>)count, 0);</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keywordflow">if</span> (read_size == -1)</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  {</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <a class="code" href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a>(<span class="stringliteral">" recv from parent: "</span> << strerror(errno));</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  }</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  parent_read_pos += read_size;</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  }</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  }</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span> }</div><div class="ttc" id="allreduce_8h_html_ae5dbb7bf6624bc7ee3c1a40fec4452e4"><div class="ttname"><a href="allreduce_8h.html#ae5dbb7bf6624bc7ee3c1a40fec4452e4">ar_buf_size</a></div><div class="ttdeci">constexpr size_t ar_buf_size</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00049">allreduce.h:49</a></div></div>
<div class="ttc" id="structnode_html"><div class="ttname"><a href="structnode.html">node</a></div><div class="ttdef"><b>Definition:</b> <a href="log__multi_8cc_source.html#l00051">log_multi.cc:51</a></div></div>
<div class="ttc" id="structnode__socks_html_a7ed2657a18004dbca8ac585405efdd56"><div class="ttname"><a href="structnode__socks.html#a7ed2657a18004dbca8ac585405efdd56">node_socks::children</a></div><div class="ttdeci">socket_t children[2]</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00055">allreduce.h:55</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a8526b19d5848d6845dd2e96afdf879ac"><div class="ttname"><a href="classAllReduceSockets.html#a8526b19d5848d6845dd2e96afdf879ac">AllReduceSockets::all_reduce_init</a></div><div class="ttdeci">void all_reduce_init()</div><div class="ttdef"><b>Definition:</b> <a href="allreduce__sockets_8cc_source.html#l00113">allreduce_sockets.cc:113</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a97b0c1d6b80b3f8aef6d01d4a89483a2"><div class="ttname"><a href="classAllReduceSockets.html#a97b0c1d6b80b3f8aef6d01d4a89483a2">AllReduceSockets::socks</a></div><div class="ttdeci">node_socks socks</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00182">allreduce.h:182</a></div></div>
<div class="ttc" id="classAllReduce_html_a749a9bf84ad8da76c59351b538b6deba"><div class="ttname"><a href="classAllReduce.html#a749a9bf84ad8da76c59351b538b6deba">AllReduce::quiet</a></div><div class="ttdeci">bool quiet</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00082">allreduce.h:82</a></div></div>
<div class="ttc" id="classAllReduce_html_a4ab695c1c631c3db42936d03733db9e0"><div class="ttname"><a href="classAllReduce.html#a4ab695c1c631c3db42936d03733db9e0">AllReduce::total</a></div><div class="ttdeci">const size_t total</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00080">allreduce.h:80</a></div></div>
<div class="ttc" id="structnode__socks_html_a9107491c00d5f397f28b1bcf50093704"><div class="ttname"><a href="structnode__socks.html#a9107491c00d5f397f28b1bcf50093704">node_socks::parent</a></div><div class="ttdeci">socket_t parent</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00054">allreduce.h:54</a></div></div>
<div class="ttc" id="vw__exception_8h_html"><div class="ttname"><a href="vw__exception_8h.html">vw_exception.h</a></div></div>
<div class="ttc" id="allreduce_8h_html_a35da5532d470440b1afd69338e9053a8"><div class="ttname"><a href="allreduce_8h.html#a35da5532d470440b1afd69338e9053a8">CLOSESOCK</a></div><div class="ttdeci">#define CLOSESOCK</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00043">allreduce.h:43</a></div></div>
<div class="ttc" id="structnode__socks_html_a8cad0619d240dff1372e89eedb2211ff"><div class="ttname"><a href="structnode__socks.html#a8cad0619d240dff1372e89eedb2211ff">node_socks::current_master</a></div><div class="ttdeci">std::string current_master</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00053">allreduce.h:53</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a345a963f2c0db12df34689612bb71de8"><div class="ttname"><a href="classAllReduceSockets.html#a345a963f2c0db12df34689612bb71de8">AllReduceSockets::pass_down</a></div><div class="ttdeci">void pass_down(char *buffer, const size_t parent_read_pos, size_t &children_sent_pos)</div><div class="ttdef"><b>Definition:</b> <a href="allreduce__sockets_8cc_source.html#l00291">allreduce_sockets.cc:291</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a1ba0231ca299faf8894fe40bd19855ae"><div class="ttname"><a href="classAllReduceSockets.html#a1ba0231ca299faf8894fe40bd19855ae">AllReduceSockets::port</a></div><div class="ttdeci">int port</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00184">allreduce.h:184</a></div></div>
<div class="ttc" id="vw__exception_8h_html_a9a08dc7c9e228832f9e243eff236be65"><div class="ttname"><a href="vw__exception_8h.html#a9a08dc7c9e228832f9e243eff236be65">THROWERRNO</a></div><div class="ttdeci">#define THROWERRNO(args)</div><div class="ttdef"><b>Definition:</b> <a href="vw__exception_8h_source.html#l00167">vw_exception.h:167</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a9b3d7b4b0c70efa1552f3093e8de1068"><div class="ttname"><a href="classAllReduceSockets.html#a9b3d7b4b0c70efa1552f3093e8de1068">AllReduceSockets::span_server</a></div><div class="ttdeci">std::string span_server</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00183">allreduce.h:183</a></div></div>
<div class="ttc" id="allreduce_8h_html_a30353f381f5fccbb956eea1f3a110b6c"><div class="ttname"><a href="allreduce_8h.html#a30353f381f5fccbb956eea1f3a110b6c">socket_t</a></div><div class="ttdeci">int socket_t</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00042">allreduce.h:42</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_a2552ae966284c09df115b89332e5c853"><div class="ttname"><a href="classAllReduceSockets.html#a2552ae966284c09df115b89332e5c853">AllReduceSockets::sock_connect</a></div><div class="ttdeci">socket_t sock_connect(const uint32_t ip, const int port)</div><div class="ttdef"><b>Definition:</b> <a href="allreduce__sockets_8cc_source.html#l00036">allreduce_sockets.cc:36</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_ad365b9d51ebb080a25ec97b8c4952889"><div class="ttname"><a href="classAllReduceSockets.html#ad365b9d51ebb080a25ec97b8c4952889">AllReduceSockets::unique_id</a></div><div class="ttdeci">size_t unique_id</div><div class="ttdef"><b>Definition:</b> <a href="allreduce_8h_source.html#l00185">allreduce.h:185</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_ae2b83b638e9352f6c166ad9df183389b"><div class="ttname"><a href="classAllReduceSockets.html#ae2b83b638e9352f6c166ad9df183389b">AllReduceSockets::broadcast</a></div><div class="ttdeci">void broadcast(char *buffer, const size_t n)</div><div class="ttdef"><b>Definition:</b> <a href="allreduce__sockets_8cc_source.html#l00313">allreduce_sockets.cc:313</a></div></div>
<div class="ttc" id="classAllReduceSockets_html_af60b694a59620607b5fc41fa29bcf63a"><div class="ttname"><a href="classAllReduceSockets.html#af60b694a59620607b5fc41fa29bcf63a">AllReduceSockets::getsock</a></div><div class="ttdeci">socket_t getsock()</div><div class="ttdef"><b>Definition:</b> <a href="allreduce__sockets_8cc_source.html#l00085">allreduce_sockets.cc:85</a></div></div>
<div class="ttc" id="allreduce_8h_html"><div class="ttname"><a href="allreduce_8h.html">allreduce.h</a></div></div>
<div class="ttc" id="vw__exception_8h_html_a6418ba1768107875abafe9a0b6b8b2ad"><div class="ttname"><a href="vw__exception_8h.html#a6418ba1768107875abafe9a0b6b8b2ad">THROW</a></div><div class="ttdeci">#define THROW(args)</div><div class="ttdef"><b>Definition:</b> <a href="vw__exception_8h_source.html#l00181">vw_exception.h:181</a></div></div>
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