diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-05-08 21:37:59 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-05-08 22:23:50 +0300 |
| commit | d65817b4e707068c2dd3e002e87c2a0294aabc2c (patch) | |
| tree | c744c2450c306e1770c55131583db85d1fbbdc8e /tools/perf/bench/Build | |
| parent | b91fc39f4ad7503419dd617df78401fa36266cb3 (diff) | |
| download | linux-d65817b4e707068c2dd3e002e87c2a0294aabc2c.tar.xz | |
perf bench futex: Support parallel waker threads
The futex-wake benchmark only measures wakeups done within a single
process. While this has value in its own, it does not really generate
any hb->lock contention.
A new benchmark 'wake-parallel' is added, by extending the futex-wake
code such that we can measure parallel waker threads. The program output
shows the avg per-thread latency in order to complete its share of
wakeups:
Run summary [PID 13474]: blocking on 512 threads (at [private] futex 0xa88668), 8 threads waking up 64 at a time.
[Run 1]: Avg per-thread latency (waking 64/512 threads) in 0.6230 ms (+-15.31%)
[Run 2]: Avg per-thread latency (waking 64/512 threads) in 0.5175 ms (+-29.95%)
[Run 3]: Avg per-thread latency (waking 64/512 threads) in 0.7578 ms (+-18.03%)
[Run 4]: Avg per-thread latency (waking 64/512 threads) in 0.8944 ms (+-12.54%)
[Run 5]: Avg per-thread latency (waking 64/512 threads) in 1.1204 ms (+-23.85%)
Avg per-thread latency (waking 64/512 threads) in 0.7826 ms (+-9.91%)
Naturally, different combinations of numbers of blocking and waker
threads will exhibit different information.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Link: http://lkml.kernel.org/r/1431110280-20231-1-git-send-email-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/bench/Build')
| -rw-r--r-- | tools/perf/bench/Build | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/bench/Build b/tools/perf/bench/Build index 5ce98023d518..c3ab760e06b4 100644 --- a/tools/perf/bench/Build +++ b/tools/perf/bench/Build @@ -3,6 +3,7 @@ perf-y += sched-pipe.o perf-y += mem-memcpy.o perf-y += futex-hash.o perf-y += futex-wake.o +perf-y += futex-wake-parallel.o perf-y += futex-requeue.o perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o |