From 2fcd15eac3223b3907837e8d7f2b3829a16a4c45 Mon Sep 17 00:00:00 2001 From: Gabriel Kerneis Date: Tue, 17 Sep 2013 17:09:39 +0200 Subject: [PATCH] coroutine: add qemu_coroutine_yield benchmark Current coroutine performance benchmarks test only coroutine creation, either directly or in a nested way. This patch adds a benchmark to evaluate the performance of qemu_coroutine_yield. Signed-off-by: Gabriel Kerneis Signed-off-by: Stefan Hajnoczi --- tests/test-coroutine.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c index 39be046ec7..2792191f82 100644 --- a/tests/test-coroutine.c +++ b/tests/test-coroutine.c @@ -202,6 +202,38 @@ static void perf_nesting(void) maxcycles, maxnesting, duration); } +/* + * Yield benchmark + */ + +static void coroutine_fn yield_loop(void *opaque) +{ + unsigned int *counter = opaque; + + while ((*counter) > 0) { + (*counter)--; + qemu_coroutine_yield(); + } +} + +static void perf_yield(void) +{ + unsigned int i, maxcycles; + double duration; + + maxcycles = 100000000; + i = maxcycles; + Coroutine *coroutine = qemu_coroutine_create(yield_loop); + + g_test_timer_start(); + while (i > 0) { + qemu_coroutine_enter(coroutine, &i); + } + duration = g_test_timer_elapsed(); + + g_test_message("Yield %u iterations: %f s\n", + maxcycles, duration); +} int main(int argc, char **argv) { @@ -214,6 +246,7 @@ int main(int argc, char **argv) if (g_test_perf()) { g_test_add_func("/perf/lifecycle", perf_lifecycle); g_test_add_func("/perf/nesting", perf_nesting); + g_test_add_func("/perf/yield", perf_yield); } return g_test_run(); } -- 2.11.0