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    SubjectRe: linux-kernel-digest V1 #5016
    > From: Peter Tufvesson <tuwe@flakey.df.lth.se>
    > Date: Wed, 5 Jan 2000 23:17:58 +0100 (CET)
    > Subject: Can a process use up more than 910MB?
    >
    > After reading/searching through this mailing list, I got the feeling a
    > process could use up to 3GB of virtual memory per default.

    If you only need <=2GB, then you can recompile the kernel with the 2GB
    option enabled, which should solve the problem. The 2.2.13 kernel (and
    presumably the 2.2.14 kernel, which I haven't tried) support this.

    If you need 3GB, you need to switch to a version of the kernel with the
    bigmem patch. I'm running 2.2.13ac3 (which you can find on
    www.kernel.org), which lets me use 3GB of virtual memory in a single
    process.

    You could also trying using a >=2.3.28 kernel, which also have the bigmem
    patch, but I couldn't get those to boot successfully.

    See http://humbolt.geo.uu.nl/Linux-MM/ for info about linux memory
    management, though it hasn't been updated in a while.

    One note: If you use mmap to get memory instead of malloc you get less
    memory. On 2.2.13ac I get 2GB maximum per process for mmap and 3GB
    maximum per process for malloc.

    Jeff



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