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    SubjectRe: [PATCH ] VMSPLIT config options (with default config fixed)
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    On Sun, 2006-02-05 at 22:14 +0100, Jan Engelhardt wrote:
    > >> >
    > >> > Mmm.. bad idea. As much as I'd like the default to be 3GB_OPT, that would
    > >> > be a big impact to userspace, and there's no point in breaking everyone's
    > >> > machines when advanced users can just reconfig/recompile to get what they want.
    > >> >
    > >> What userspace programs do depend on it?
    > >
    > >there is a lot of userspace that assumes they can do 2Gb or even close
    > >to 3Gb of memory allocations. Databases, java, basically anything with
    > >threads. Sure for most of these its a configuration option to reduce
    > >this, but that still doesn't mean it's a good idea to change from the
    > >existing behavior...
    > >
    > Not to mention that these (almost(*)) fail anyway when you have less than 2
    > GB of RAM.

    it's not really overcommit... it can also be file mmaps or shared mmaps
    of say tmpfs files (the later is common with oracle actually)



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