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    SubjectRe: [PATCH 1/5] cpuset memory spread basic implementation
    Paul Jackson <pj@sgi.com> wrote:
    >
    > This policy can provide substantial improvements for jobs that
    > need to place thread local data on the corresponding node, but
    > that need to access large file system data sets that need to
    > be spread across the several nodes in the jobs cpuset in order
    > to fit. Without this patch, especially for jobs that might
    > have one thread reading in the data set, the memory allocation
    > across the nodes in the jobs cpuset can become very uneven.


    It all seems rather ironic. We do vast amounts of development to make
    certain microbenchmarks look good, then run a real workload on the thing,
    find that all those microbenchmark-inspired tweaks actually deoptimised the
    real workload? So now we need to add per-task knobs to turn off the
    previously-added microbenchmark-tweaks.

    What happens if one process does lots of filesystem activity and another
    one (concurrent or subsequent) wants lots of thread-local storage? Won't
    the same thing happen?

    IOW: this patch seems to be a highly specific bandaid which is repairing an
    ill-advised problem of our own making, does it not?
    -
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