lkml.org 
[lkml]   [2009]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [UPDATED][PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5)
* Ingo Molnar <mingo@elte.hu> [2009-08-13 10:35:24]:

>
> * Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>
> > Without Patch
> >
> > Performance counter stats for '/home/balbir/parallel_pagefault':
> >
> > 5826093739340 cycles # 809.989 M/sec
> > 408883496292 instructions # 0.070 IPC
> > 7057079452 cache-references # 0.981 M/sec
> > 3036086243 cache-misses # 0.422 M/sec
>
> > With this patch applied
> >
> > Performance counter stats for '/home/balbir/parallel_pagefault':
> >
> > 5957054385619 cycles # 828.333 M/sec
> > 1058117350365 instructions # 0.178 IPC
> > 9161776218 cache-references # 1.274 M/sec
> > 1920494280 cache-misses # 0.267 M/sec
>
> Nice how the instruction count and the IPC value incraesed, and the
> cache-miss count decreased.
>
> Btw., a 'perf stat' suggestion: you can also make use of built-in
> error bars via repeating parallel_pagefault N times:
>
> aldebaran:~> perf stat --repeat 3 /bin/ls

Ingo, with the repeat experiements I see

7192354.545647 task-clock-msecs # 23.955 CPUs ( +- 0.002% )
425627 context-switches # 0.000 M/sec ( +- 0.333% )
155 CPU-migrations # 0.000 M/sec ( +- 10.897% )
95336481 page-faults # 0.013 M/sec ( +- 0.085% )
5951929070187 cycles # 827.536 M/sec ( +- 0.009% )
1058312583796 instructions # 0.178 IPC ( +- 0.076% )
9616609083 cache-references # 1.337 M/sec ( +- 2.536% )
1952367514 cache-misses # 0.271 M/sec ( +- 0.156% )

300.246532761 seconds time elapsed ( +- 0.002% )

Except for the CPU migrations and the cache references, all the other
parameters seem to be well within an acceptable error range.


--
Balbir


\
 
 \ /
  Last update: 2009-08-14 04:03    [W:0.623 / U:1.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site