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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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