Stagger ramp-up to avoid large -j from becoming thundering herd

419304a9 · Poul-Henning Kamp · fa7b4f2b · 419304a9
Commit 419304a9 authored Oct 22, 2012 by Poul-Henning Kamp
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vtc_main.c bin/varnishtest/vtc_main.c +3 -0

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--- a/bin/varnishtest/vtc_main.c
+++ b/bin/varnishtest/vtc_main.c
@@ -405,6 +405,9 @@ main(int argc, char * const *argv)
 		if (!VTAILQ_EMPTY(&tst_head) && njob < npar) {
 			start_test();
 			njob++;
+			/* Stagger ramp-up */
+			if (njob < npar)
+				(void)usleep(random() % 100000L);
 			i = 1;
 			continue;
 		}