From 61ff8cfbec64f08f6955fe04649665f9f7eb0cc6 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Wed, 13 Aug 2014 18:08:47 +0800 Subject: [PATCH] test-coroutine: test cost introduced by coroutine This test runs dummy function with coroutine by using two enter and one yield since which is a common usage. So we can see the cost introduced by corouting for running one function, for example: Run operation 20000000 iterations 4.841071 s, 4131K operations/s 242ns per coroutine Signed-off-by: Ming Lei Signed-off-by: Kevin Wolf --- tests/test-coroutine.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c index 6e634f4a78..e22fae170a 100644 --- a/tests/test-coroutine.c +++ b/tests/test-coroutine.c @@ -311,6 +311,35 @@ static void perf_baseline(void) maxcycles, duration); } +static __attribute__((noinline)) void perf_cost_func(void *opaque) +{ + qemu_coroutine_yield(); +} + +static void perf_cost(void) +{ + const unsigned long maxcycles = 40000000; + unsigned long i = 0; + double duration; + unsigned long ops; + Coroutine *co; + + g_test_timer_start(); + while (i++ < maxcycles) { + co = qemu_coroutine_create(perf_cost_func); + qemu_coroutine_enter(co, &i); + qemu_coroutine_enter(co, NULL); + } + duration = g_test_timer_elapsed(); + ops = (long)(maxcycles / (duration * 1000)); + + g_test_message("Run operation %lu iterations %f s, %luK operations/s, " + "%luns per coroutine", + maxcycles, + duration, ops, + (unsigned long)(1000000000 * duration) / maxcycles); +} + int main(int argc, char **argv) { g_test_init(&argc, &argv, NULL); @@ -325,6 +354,7 @@ int main(int argc, char **argv) g_test_add_func("/perf/nesting", perf_nesting); g_test_add_func("/perf/yield", perf_yield); g_test_add_func("/perf/function-call", perf_baseline); + g_test_add_func("/perf/cost", perf_cost); } return g_test_run(); }