Merge pull request #70 from mochi-hpc-experiments/snyder/thread-id-cost

add node microbenchmark tests for `gettid()` & `pthread_self()`

perf-regression/node-microbench.c

@@ -14,6 +14,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <sys/time.h>
+#include <sys/types.h>
 #include <time.h>
 #include <pthread.h>
 #include <stdatomic.h>
@@ -23,6 +24,7 @@
 #ifdef HAVE_ABT_H
     #include <abt.h>
 #endif
+#include <pthread.h>
 
 #include <mpi.h>
 
@@ -63,6 +65,8 @@ static void test_abt_eventual_dynamic_allocation(long unsigned iters);
 static void test_abt_eventual_static_allocation(long unsigned iters);
     #endif
 #endif
+static void test_pthread_self(long unsigned iters);
+static void test_gettid(long unsigned iters);
 
 static struct options   g_opts;
 static struct test_case g_test_cases[] = {
@@ -88,6 +92,8 @@ static struct test_case g_test_cases[] = {
     {"ABT_eventual static per fn", test_abt_eventual_static_allocation},
     #endif
 #endif
+    {"pthread_self", test_pthread_self},
+    {"gettid", test_gettid},
     {NULL, NULL}};
 
 int main(int argc, char** argv)
@@ -426,3 +432,23 @@ static void test_abt_eventual_static_allocation(long unsigned iters)
     #endif /* ABT_EVENTUAL_INITIALIZER */
 
 #endif /* HAVE_ABT_H */
+
+/* how expensive is pthread_self()? */
+static void test_pthread_self(long unsigned iters)
+{
+    long unsigned  i;
+
+    for (i = 0; i < iters; i++) { pthread_self(); }
+
+    return;
+}
+
+/* how expensive is gettid()? */
+static void test_gettid(long unsigned iters)
+{
+    long unsigned  i;
+
+    for (i = 0; i < iters; i++) { gettid(); }
+
+    return;
+}