From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60072) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VN4j4-0003Nz-F0 for qemu-devel@nongnu.org; Fri, 20 Sep 2013 13:42:47 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VN4iz-0005Db-J3 for qemu-devel@nongnu.org; Fri, 20 Sep 2013 13:42:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42300) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VN4iz-0005DW-AK for qemu-devel@nongnu.org; Fri, 20 Sep 2013 13:42:37 -0400 From: Stefan Hajnoczi Date: Fri, 20 Sep 2013 19:42:06 +0200 Message-Id: <1379698931-946-7-git-send-email-stefanha@redhat.com> In-Reply-To: <1379698931-946-1-git-send-email-stefanha@redhat.com> References: <1379698931-946-1-git-send-email-stefanha@redhat.com> Subject: [Qemu-devel] [PULL 06/11] coroutine: add qemu_coroutine_yield benchmark List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gabriel Kerneis , Stefan Hajnoczi , Anthony Liguori From: Gabriel Kerneis 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 39be046..2792191 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(); } -- 1.8.3.1