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<section id="geopm-comm-3-communication-abstractions">
<h1>geopm::Comm(3) – communication abstractions<a class="headerlink" href="#geopm-comm-3-communication-abstractions" title="Link to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Comm</span></code> class and the <code class="docutils literal notranslate"><span class="pre">CommFactory</span></code> class are members of
the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but the full names, <code class="docutils literal notranslate"><span class="pre">geopm::Comm</span></code> and
<code class="docutils literal notranslate"><span class="pre">geopm::CommFactory</span></code>, have been abbreviated in this manual.
Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::pair</span></code>, <code class="docutils literal notranslate"><span class="pre">std::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::map</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable
better rendering of this manual.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopm/include/Comm.hpp"><geopm/Comm.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(MPI)</strong> or <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(non-MPI)</strong></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">static</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">comm_names</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">make_unique</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">comm_name</span><span class="p">);</span>
<span class="k">static</span><span class="w"> </span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">make_unique</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">split</span><span class="p">()</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">split</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">color</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">key</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">split</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">tag</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">split_type</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">split</span><span class="p">(</span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">dimensions</span><span class="p">,</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">periods</span><span class="p">,</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">is_reorder</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">shared_ptr</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">split_cart</span><span class="p">(</span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">dimensions</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Comm::comm_supported</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">description</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Comm::cart_rank</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">coords</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Comm::rank</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">Comm::num_rank</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::dimension_create</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">num_ranks</span><span class="p">,</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">dimension</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::free_mem</span><span class="p">(</span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">base</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::alloc_mem</span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">size</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">**</span><span class="n">base</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="nf">Comm::window_create</span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">size</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">base</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::window_destroy</span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">window_id</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::window_lock</span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">window_id</span><span class="p">,</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">is_exclusive</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rank</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">assert</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::window_unlock</span><span class="p">(</span><span class="kt">size_t</span><span class="w"> </span><span class="n">window_id</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rank</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::coordinate</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">rank</span><span class="p">,</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">coord</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">Comm</span><span class="o">::</span><span class="n">coordinate</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">rank</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::barrier</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::broadcast</span><span class="p">(</span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">buffer</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">size</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">root</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="nf">Comm::test</span><span class="p">(</span><span class="kt">bool</span><span class="w"> </span><span class="n">is_true</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::reduce_max</span><span class="p">(</span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">send_buf</span><span class="p">,</span><span class="w"> </span><span class="kt">double</span><span class="w"> </span><span class="o">*</span><span class="n">recv_buf</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">count</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">root</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::gather</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">send_buf</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">send_size</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">recv_buf</span><span class="p">,</span>
<span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">recv_size</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">root</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::gatherv</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">send_buf</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">send_size</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">recv_buf</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">size_t</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">recv_sizes</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">vector</span><span class="o"><</span><span class="kt">off_t</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">rank_offset</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">root</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::window_put</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">send_buf</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">send_size</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rank</span><span class="p">,</span><span class="w"> </span><span class="kt">off_t</span><span class="w"> </span><span class="n">disp</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">window_id</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
<span class="k">virtual</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">Comm::tear_down</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Comm</span></code> class is abstract base class for interprocess communication in GEOPM.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">CommFactory</span></code> class is a specialization of <code class="docutils literal notranslate"><span class="pre">PluginFactory</span></code> class which creates instances of <code class="docutils literal notranslate"><span class="pre">Comm</span></code> class.</p>
</section>
<section id="enum-type">
<h2>Enum Type<a class="headerlink" href="#enum-type" title="Link to this heading"></a></h2>
<p>There are two <code class="docutils literal notranslate"><span class="pre">enum</span></code>s defined in the <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopm/include/Comm.hpp"><geopm/Comm.hpp></a>.
<code class="docutils literal notranslate"><span class="pre">Comm::m_comm_split_type_e</span></code> and <code class="docutils literal notranslate"><span class="pre">Comm::m_split_color_e</span></code></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">enum</span><span class="w"> </span><span class="nc">Comm</span><span class="o">::</span><span class="n">m_comm_split_type_e</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">M_COMM_SPLIT_TYPE_PPN1</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_COMM_SPLIT_TYPE_SHARED</span><span class="p">,</span>
<span class="w"> </span><span class="n">M_NUM_COMM_SPLIT_TYPE</span>
<span class="p">};</span>
<span class="k">enum</span><span class="w"> </span><span class="nc">Comm</span><span class="o">::</span><span class="n">m_split_color_e</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">M_SPLIT_COLOR_UNDEFINED</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">-16</span><span class="p">,</span>
<span class="p">};</span>
</pre></div>
</div>
</section>
<section id="factory-accessor">
<h2>Factory Accessor<a class="headerlink" href="#factory-accessor" title="Link to this heading"></a></h2>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="k">class</span><span class="w"> </span><span class="nc">CommFactory</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="k">public</span><span class="w"> </span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">Comm</span><span class="o">></span>
<span class="p">{</span>
<span class="w"> </span><span class="k">public</span><span class="o">:</span>
<span class="w"> </span><span class="n">CommFactory</span><span class="p">();</span>
<span class="w"> </span><span class="k">virtual</span><span class="w"> </span><span class="o">~</span><span class="n">CommFactory</span><span class="p">()</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">default</span><span class="p">;</span>
<span class="p">};</span>
<span class="n">CommFactory</span><span class="w"> </span><span class="o">&</span><span class="nf">comm_factory</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>
</pre></div>
</div>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">comm_factory()</span></code>:
This method returns the singleton accessor for the Comm factory.
Calling this method will create the factory if it does not already exist.</p></li>
</ul>
</section>
<section id="class-methods">
<h2>Class Methods<a class="headerlink" href="#class-methods" title="Link to this heading"></a></h2>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">comm_names()</span></code>:
Returns a list of all valid plugin names in the Comm interface.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">make_unique()</span></code>:
Allocate an object of requested <code class="docutils literal notranslate"><span class="pre">Comm</span></code> type, attached to a <code class="docutils literal notranslate"><span class="pre">unique_ptr</span></code>,
optionally having a <em>comm_name</em>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">split()</span></code>:
Allocate a new <code class="docutils literal notranslate"><span class="pre">MPIComm</span></code> and return it as a <code class="docutils literal notranslate"><span class="pre">shared_ptr</span></code>,
optionally passing in different sets of parameters to the constructor of this class.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">comm_supported()</span></code>:
Check if the provided string <em>description</em> of the plugin is actually supported by the comm.
The passed in <em>description</em> is the <em>plugin_name</em>, which is initialized internally by the comm.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">cart_rank()</span></code>:
Process rank within Cartesian communicator. Pertains to Introspection.
The const reference to a vector of integers parameter <em>coords</em> represents the
coordinate of Cartesian communicator member whose rank we wish to know.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">rank()</span></code>:
Get the current process rank within the communicator.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">num_rank()</span></code>:
Get the total number of all ranks in the communicator.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">dimension_create()</span></code>:
Populate vector of optimal dimensions given the number of ranks the communicator
The <strong>in</strong> parameter <em>num_ranks</em> is the number of ranks that must fit in Cartesian grid.
The <strong>in, out</strong> vector parameter <em>dimension</em> is the number of ranks per dimension.
The size of this vector dictates the number of dimensions in the grid.
Fill indices with 0 for API to fill with suitable value.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">free_mem()</span></code>:
Free memory that was allocated for message passing and RMA
The <strong>in</strong> parameter <em>base</em> is the address of memory to be released.
It was created from the <code class="docutils literal notranslate"><span class="pre">alloc_mem()</span></code> call.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">alloc_mem()</span></code>:
Allocate memory for message passing and RMA
You pass in the <em>size</em> of the desired memory allocation.
The <em>base</em> address of allocated memory is “returned” in the second parameter.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">window_create()</span></code>:
Create window for message passing and RMA
Return window handle for subsequent operations on the window.
For creation we pass in the <em>size</em> of the memory area backing the RMA window,
and the <em>base</em> address of memory that has been allocated for the window.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">window_destroy()</span></code>:
Destroy window for message passing and RMA,
providing it the parameter <em>window_id</em> the window handle for the target window.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">window_lock()</span></code>:
Begin epoch for message passing and RMA.
The parameters:
<strong>in</strong> <em>window_id</em> The window handle for the target window.
<strong>in</strong> <em>is_exclusive</em> Lock type for the window, true for exclusive lock, false for shared.
<strong>in</strong> <em>rank</em> of the locked window.
<strong>in</strong> <em>assert</em> Used to optimize call.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">window_unlock()</span></code>:
End epoch for message passing and RMA
The parameters:
<strong>in</strong> <em>window_id</em> The window handle for the target window.
<strong>in</strong> <em>rank</em> of the locked window.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">coordinate()</span></code>:
Coordinate in Cartesian grid for specified rank
The parameters:
<strong>in</strong> <em>rank</em> for which coordinates should be calculated
<strong>in, out</strong> <em>coord</em> Cartesian coordinates of specified rank.
The size of this vector should equal the number of dimensions
that the Cartesian communicator was created with.
Also includes an overloaded form which takes just the <em>rank</em> as a parameter
and returns the <em>coord</em> vector by value.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">barrier()</span></code>:
Is a barrier for all ranks. Pertains to collective communication.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">broadcast()</span></code>:
Broadcast a message to all ranks
The parameters:
<strong>in, out</strong> <em>buffer</em> Starting address of buffer to be broadcasted.
<strong>in</strong> <em>size</em> of the buffer.
<strong>in</strong> <em>root</em> Rank of the broadcast root (target).</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">test()</span></code>:
Test whether or not all ranks in the communicator present
the same input and return <em>true</em>/<em>false</em> accordingly.
The parameter <strong>in</strong> <em>is_true</em> Boolean value to be reduced from all ranks.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">reduce_max()</span></code>:
Reduce distributed messages across all ranks using specified operation, store result on all ranks
The parameters:
<strong>in</strong> <em>send_buf</em> Start address of memory buffer to be transmitted.
<strong>out</strong> <em>recv_buf</em> Start address of memory buffer to receive data.
<strong>in</strong> <em>count</em> Size of buffer in bytes to be transmitted.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">gather()</span></code>:
Gather bytes from all processes
The parameters:
<strong>in</strong> <em>send_buf</em> Start address of memory buffer to be transmitted.
<strong>in</strong> <em>send_size</em> Size of buffer to be sent.
<strong>out</strong> <em>recv_buf</em> Start address of memory buffer to receive data.
<strong>in</strong> <em>recv_size</em> The size of the buffer to be received.
<strong>in</strong> <em>root</em> Rank of the target for the transmission.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">gatherv()</span></code>:
Gather bytes into specified location from all processes
The parameters:
<strong>in</strong> <em>send_buf</em> Start address of memory buffer to be transmitted.
<strong>in</strong> <em>send_size</em> Size of buffer to be sent.
<strong>out</strong> <em>recv_buf</em> Start address of memory buffer to receive data.
<strong>in</strong> <em>recv_sizes</em> Vector describing the buffer size per rank to be received.
<strong>in</strong> <em>rank_offset</em> Offset per rank into target buffer for transmitted data.
<strong>in</strong> <em>root</em> Rank of the target for the transmission.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">window_put()</span></code>:
Perform message passing or RMA.
The parameters:
<strong>in</strong> <em>send_buf</em> Starting address of buffer to be transmitted via window.
<strong>in</strong> <em>send_size</em> Size in bytes of buffer to be sent.
<strong>in</strong> <em>rank</em> Target rank of the transmission.
<strong>in</strong> <em>disp</em> Displacement from start of window.
<strong>in</strong> <em>window_id</em> The window handle for the target window.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">tear_down()</span></code>:
Clean up resources held by the comm.
This allows static global objects to be cleaned up before the destructor is called.</p></li>
</ul>
</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Link to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a></p>
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