tests: benchmark: use cpu-bound workload, calculate average and std.dev.

[lttng-ust.git] / tests / benchmark / bench.c

diff --git a/tests/benchmark/bench.c b/tests/benchmark/bench.c
index 1626fd2beeb7998db7a9d755cd942570689a1faf..c23f07c3d0153278efed3b44a8de1fd6d59c9e50 100644 (file)
--- a/tests/benchmark/bench.c
+++ b/tests/benchmark/bench.c
@@ -12,6 +12,7 @@
 #include <unistd.h>
 #include <sched.h>
 #include <time.h>
+#include <urcu/compiler.h>
 
 #ifdef TRACING
 #define TRACEPOINT_DEFINE
@@ -23,28 +24,23 @@ static unsigned long nr_events;
 
 void do_stuff(void)
 {
-       int v;
-       FILE *file;
-
-       v = 1;
-
-       file = fopen("/dev/null", "a");
-       fprintf(file, "%d", v);
-       fclose(file);
-       time(NULL);
+       int i;
+#ifdef TRACING
+       int v = 50;
+#endif
 
+       for (i = 0; i < 100; i++)
+               cmm_barrier();
 #ifdef TRACING
        tracepoint(ust_tests_benchmark, tpbench, v);
 #endif
-
 }
 
-
 void *function(void *arg)
 {
        unsigned long i;
 
-       for(i = 0; i < nr_events; i++) {
+       for (i = 0; i < nr_events; i++) {
                do_stuff();
        }
        return NULL;