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SubjectRe: [UPDATED][PATCH][mmotm] Help Root Memory Cgroup Resource Counters Scale Better (v5)

* Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> * 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.

Yeah, nice!

Ingo


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