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    SubjectRe: BSD reminiscent resource starvation under Linux?
    I've you've got 150-200 concurrent requests then there are 200 or so tasks
    running apache. There's a per-user limit of 256 tasks. Unfortunately
    it's a compile time constant (bleh). Find NR_TASKS and increase it. You
    can go as high as something around 4000... you may also want to change the
    per-user limit... since it's foolish to save 2000 tasks for root.

    Dean

    On Fri, 11 Sep 1998, Josh Beck wrote:

    > Hello,
    >
    > Hopefully this problem has been addressed before, but here goes:
    >
    > I have a busy web server (kernel 2.0.35), running Apache 1.3.1. I removed
    > the Apache USE_MMAP_FILES define, as the server is handling an average of
    > 150-200 concurrent requests for files which are 3-5 MB in size, and I
    > didn't want to have 500+ MB of RAM in the box to handle this. All is fine
    > and well, everything fits comfortably into memory. The load stays
    > reasonably low (.3-.6), and the machine serves about 30,000 - 40,000 such
    > files per day.
    >
    > Anyways, the problem is that cgi's error quite often, with the following
    > nasty errors in the error_log:
    >
    > [Thu Sep 10 07:57:25 1998] [error] (11)Resource temporarily unavailable:
    > couldn't spawn child process: /usr/local/www/cgi-bin/upload4.cgi
    >
    > This is something that I am quite accustomed to under FreeBSD on even
    > moderately loaded web servers, and I know how to fix. I was pretty
    > surprised to see this happen under linux, and don't really know what the
    > cause might be.
    >
    > I upped NR_INODE and NR_FILE in the kernel, but that doesn't appear to
    > have helped, here are the contents of /proc/sys/kernel/*
    > inode-max 16384
    > inore-nr 1072 710
    > file-max 4096
    > file-nr 900
    >
    > If anyone has any pointers or has encountered this before, I'd be very
    > grateful for a bit of help.
    >
    > Thanks!
    >
    > Josh Beck josh@zcompany.com
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