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    SubjectRe: Linux 2.4.10-pre11


    On Tue, 18 Sep 2001, Andrea Arcangeli wrote:

    > On Mon, Sep 17, 2001 at 10:48:34PM -0700, Andrew Morton wrote:
    > > Linus Torvalds wrote:
    > > >
    > > > Ok, the big thing here is continued merging, this time with Andrea.
    > > >
    > >
    > > In one test here the VM changes seem fragile, and slower.
    > >
    > > Dual x86, 512 megs RAM, 512 megs swap. No highmem.
    > >
    > > The workload is:
    > >
    > > while true
    > > do
    > > /usr/src/ext3/tools/usemem 300
    > > done
    > >
    > > (This just mallocs 300 megs, touches it then exits)
    > >
    > > in parallel with
    > >
    > > time /usr/src/ext3/tools/bash-shared-mapping -n 5 -t 3 foo 300000000
    > >
    > > on ext2.
    > >
    > > (bash-shared-mapping is a tool which I wrote for ext3. It's one of the
    > > most aggressive VM/MM stress testers around, and has found a number of
    > > kernel bugs).
    > >
    > > On 2.4.9-ac10, the b-s-m run took 294 seconds. On 2.4.10-pre11 it
    > > took 330 seconds DESPITE the fact that one of the b-s-m instances
    > > was oom-killed quite early in the test.
    > >
    > > `vmstat' took about thirty seconds to start (this is usual), but
    > > was promptly killed, despite having (presumably) a small RSS. Instances
    > > of `usemem' were oom-killed quite frequently. In 2.4.9-ac10, nothing
    > > was oom-killed.
    >
    > should be the very same problem identified by Marcelo. I'm wondering why
    > I didn't reproduced here during testing, 512mbytes is not highmem and my
    > desktop has 512mbytes too and it didn't killed anything yet. As for the
    > slowdown there are a few localized places to look at. but let's fix the
    > oom first.

    Try to run several memory hungry threads (thus hiding more pages).

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