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    SubjectRe: 2.2.0-pre[56] swap performance poor with > 1 thrashing task
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    Dax Kelson <dkelson@inconnect.com> writes:

    > On 7 Jan 1999, Zlatko Calusic wrote:
    > >
    > > 1) Swap performance in pre-5 is much worse compared to pre-4 in
    > > *certain* circumstances. I'm using quite stupid and unintelligent
    > > program to check for raw swap speed (attached below). With 64 MB of
    > > RAM I usually run it as 'hogmem 100 3' and watch for result which is
    > > recently around 6 MB/sec. But when I lately decided to start two
    > > instances of it like "hogmem 50 3 & hogmem 50 3 &" in pre-4 I got 2 x
    > > 2.5 MB/sec and in pre-5 it is only 2 x 1 MB/sec and disk is making
    > > very weird and frightening sounds. My conclusion is that now (pre-5)
    > > system behaves much poorer when we have more than one thrashing
    > > task. *Please*, check this, it is a quite serious problem.
    >
    > I just tried this on 2.2.0-pre6 PentiumII 412Mhz, 128MB SDRAM, one IDE
    > disk (/ & swap).
    >
    > ./hogmem 200 3
    > Memory speed: 9.01 MB/sec
    >
    > ./hogmem 100 3 & ./hogmem 100 3
    > Memory speed: 0.96 MB/sec
    > Memory speed: 0.96 MB/sec
    >

    I have a fix for this, together with a great improvement in swapping
    speed that I'll be sending in few moments, after some final testing.

    pre6 is VERY good, and with my changes, we will have fastest MM ever!
    --
    Zlatko

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