Re: BFS vs. mainline scheduler benchmarks and measurements
From: Jens Axboe
Date: Thu Sep 10 2009 - 07:35:25 EST
On Thu, Sep 10 2009, Mike Galbraith wrote:
>
On Thu, 2009年09月10日 at 13:24 +0200, Jens Axboe wrote:
>
> On Thu, Sep 10 2009, Mike Galbraith wrote:
>
>
> > xmodmap doesn't seem to be running in this sample.
>
>
>
> That's weird, it was definitely running. I did:
>
>
>
> sleep 1; xmodmap .xmodmap-carl
>
>
>
> in one xterm, and then switched to the other and ran the sched_debug
>
> dump. I have to do it this way, as X will not move focus once xmodmap
>
> starts running. It could be that xmodmap is mostly idle, and the real
>
> work is done by Xorg and/or xfwm4 (my window manager).
>
>
Hm. Ok, I'll crawl over it, see if anything falls out.
That seems to be confirmed with the low context switch rate of the perf
stat of xmodmap. If I run perf stat -a to get a system wide collection
for xmodmap, I get:
Performance counter stats for 'xmodmap .xmodmap-carl':
20112.060925 task-clock-msecs # 1.998 CPUs
629360 context-switches # 0.031 M/sec
8 CPU-migrations # 0.000 M/sec
13489 page-faults # 0.001 M/sec
<not counted> cycles
<not counted> instructions
<not counted> cache-references
<not counted> cache-misses
10.067532449 seconds time elapsed
And again, system is idle while this is happening. Can't rule out that
this is some kind of user space bug of course.
--
Jens Axboe
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