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[Qemu-devel] [PULL 33/62] test-coroutine: add baseline test that times t
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 33/62] test-coroutine: add baseline test that times the cost of function calls |
Date: |
Fri, 8 Aug 2014 19:39:34 +0200 |
From: Paolo Bonzini <address@hidden>
This can be used to compute the cost of coroutine operations. In the
end the cost of the function call is a few clock cycles, so it's pretty
cheap for now, but it may become more relevant as the coroutine code
is optimized.
For example, here are the results on my machine:
Function call 100000000 iterations: 0.173884 s
Yield 100000000 iterations: 8.445064 s
Lifecycle 1000000 iterations: 0.098445 s
Nesting 10000 iterations of 1000 depth each: 7.406431 s
One yield takes 83 nanoseconds, one enter takes 97 nanoseconds,
one coroutine allocation takes (roughly, since some of the allocations
in the nesting test do hit the pool) 739 nanoseconds:
(8.445064 - 0.173884) * 10^9 / 100000000 = 82.7
(0.098445 * 100 - 0.173884) * 10^9 / 100000000 = 96.7
(7.406431 * 10 - 0.173884) * 10^9 / 100000000 = 738.9
Signed-off-by: Paolo Bonzini <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
tests/test-coroutine.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/tests/test-coroutine.c b/tests/test-coroutine.c
index 760636d..6e634f4 100644
--- a/tests/test-coroutine.c
+++ b/tests/test-coroutine.c
@@ -288,6 +288,29 @@ static void perf_yield(void)
maxcycles, duration);
}
+static __attribute__((noinline)) void dummy(unsigned *i)
+{
+ (*i)--;
+}
+
+static void perf_baseline(void)
+{
+ unsigned int i, maxcycles;
+ double duration;
+
+ maxcycles = 100000000;
+ i = maxcycles;
+
+ g_test_timer_start();
+ while (i > 0) {
+ dummy(&i);
+ }
+ duration = g_test_timer_elapsed();
+
+ g_test_message("Function call %u iterations: %f s\n",
+ maxcycles, duration);
+}
+
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
@@ -301,6 +324,7 @@ int main(int argc, char **argv)
g_test_add_func("/perf/lifecycle", perf_lifecycle);
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);
}
return g_test_run();
}
--
1.8.3.1
- [Qemu-devel] [PULL 23/62] block/archipelago: Implement bdrv_parse_filename(), (continued)
- [Qemu-devel] [PULL 23/62] block/archipelago: Implement bdrv_parse_filename(), Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 25/62] QMP: Add support for Archipelago, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 22/62] block: Support Archipelago as a QEMU block backend, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 26/62] qemu-iotests: add support for Archipelago protocol, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 27/62] coroutine: make pool size dynamic, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 28/62] block: bump coroutine pool size for drives, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 29/62] thread-pool: avoid per-thread-pool EventNotifier, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 30/62] thread-pool: avoid deadlock in nested aio_poll() calls, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 31/62] block: vhdx - add error check, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 32/62] block: VHDX endian fixes, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 33/62] test-coroutine: add baseline test that times the cost of function calls,
Kevin Wolf <=
- [Qemu-devel] [PULL 34/62] block: allow bdrv_unref() to be passed NULL pointers, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 36/62] block: use the standard 'ret' instead of 'result', Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 39/62] block: Introduce qemu_try_blockalign(), Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 37/62] block: vpc - use block layer ops in vpc_create, instead of posix calls, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 35/62] block: vdi - use block layer ops in vdi_create, instead of posix calls, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 41/62] bochs: Handle failure for potentially large allocations, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 38/62] block: iotest - update 084 to test static VDI image creation, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 40/62] block: Handle failure for potentially large allocations, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 42/62] cloop: Handle failure for potentially large allocations, Kevin Wolf, 2014/08/08
- [Qemu-devel] [PULL 44/62] dmg: Handle failure for potentially large allocations, Kevin Wolf, 2014/08/08