From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47704) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XKqCS-00014y-7T for qemu-devel@nongnu.org; Fri, 22 Aug 2014 10:52:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XKqCN-0005en-9R for qemu-devel@nongnu.org; Fri, 22 Aug 2014 10:52:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28537) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XKqCM-0005eg-R6 for qemu-devel@nongnu.org; Fri, 22 Aug 2014 10:52:15 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s7MEqEMT027530 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Fri, 22 Aug 2014 10:52:14 -0400 From: Kevin Wolf Date: Fri, 22 Aug 2014 16:51:35 +0200 Message-Id: <1408719113-5316-12-git-send-email-kwolf@redhat.com> In-Reply-To: <1408719113-5316-1-git-send-email-kwolf@redhat.com> References: <1408719113-5316-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 11/29] test-coroutine: test cost introduced by coroutine List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com From: Ming Lei 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 6e634f4..e22fae1 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(); } -- 1.8.3.1