* sysdep.c: worker_thread(): Make scheduling a little more fair to higher

[citadel.git] / citadel / stress.c

diff --git a/citadel/stress.c b/citadel/stress.c
index ba141d0b91dabb6848ab021601daf8183cd1e457..90d4951578de3218bf88c9082f8f6fc62d0bee2c 100644 (file)
--- a/citadel/stress.c
+++ b/citadel/stress.c
@@ -196,9 +196,15 @@ void* worker(void* data)
                struct ctdlipcroom *rret;
                struct timeval tv;
                long tstart, tend;
+               int wait;
 
                /* Wait for a while */
-               sleep(w);
+               pthread_mutex_lock(&rand_mutex);
+               /* See Numerical Recipes in C or Knuth vol. 2 ch. 3 */
+               /* Randomize between w/3 to w*3 (yes, it's complicated) */
+               wait = (int)((1.0+2.7*(float)w)*rand()/(RAND_MAX+(float)w/3.0)); /* range 0-99 */
+               pthread_mutex_unlock(&rand_mutex);
+               sleep(wait);
 
                gettimeofday(&tv, NULL);
                tstart = tv.tv_sec * 1000 + tv.tv_usec / 1000; /* cvt to msec */