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SubjectRe: Help Resource Counters Scale better (v4)


Andi Kleen wrote:
> Prarit Bhargava <prarit@redhat.com> writes:
>
>> On a 64p/32G system running 2.6.31-git2-rc5, with RESOURCE_COUNTERS
>>
>
> This is CONFIG_RESOURCE_COUNTERS off at compile time right?
>
>
>> off, "time make -j64" results in
>>

^^^ yes. It is off.

>> real 4m54.972s
>> user 90m13.456s
>> sys 50m19.711s
>>
>> On the same system, running 2.6.31-git2-rc5, with RESOURCE_COUNTERS on,
>> plus Balbir's "Help Resource Counters Scale Better (v3)" patch, and
>> this patch, results in
>>
>> real 4m18.607s
>> user 84m58.943s
>> sys 50m52.682s
>>
>
> Hmm, so resource counters on with the patch is faster than
> CONFIG_RESOURCE_COUNTERS compiled out in real time? That seems
> counterintuitive. At best I would expect the patch to break even, but
> not be actually faster.
>

That is only after one run. I'm doing 10 reboot and build runs right
now and will average them out. I'll ping back here with results.

>
> Still it looks like the patch is clearly needed.
>
>

P.


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