python extension & perf tests

perf/cpp/local_thr.cpp

@@ -63,12 +63,15 @@ int main (int argc, char *argv [])
 
     uint64_t elapsed = ((uint64_t) end.tv_sec * 1000000 + end.tv_usec) -
         ((uint64_t) start.tv_sec * 1000000 + start.tv_usec);
-
+    if (elapsed == 0)
+        elapsed = 1;
     uint64_t throughput = (uint64_t) message_count * 1000000 / elapsed;
+    double megabits = (double) (throughput * message_size * 8) / 1000000;
 
     printf ("message size: %d [B]\n", (int) message_size);
     printf ("message count: %d\n", (int) message_count);
     printf ("mean throughput: %d [msg/s]\n", (int) throughput);
+    printf ("mean throughput: %3f [Mb/s]\n", (double) megabits);
 
     return 0;
 }