I have three web servers, Linux 2.6.13 based running Apache 2.0.54 (From
Debian). They are all running using worker.c, with the following config:
<IfModule worker.c>
ThreadLimit 128
ServerLimit 128
StartServers 64
MaxClients 4096
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 128
MaxRequestsPerChild 10000
</IfModule>
Two work fine, with only a couple of Apache processes running. The third
starts by spawning 4096 Apache processes, then ends up with 134 running
after a couple of minutes. As far as I can tell using md5sum, all of the
libraries and binaries are the same on the boxes, however this third one
behaves differently. If I browse to /server-status on any of the three
machines, they all only have a single PID listed at the bottom. Even
though there are 134 Apache processes, only one seems to be doing something.
Is there a specific kernel issue, or something with libc which would
cause Apache to use processes rather than threads when using worker.c?
I've hit a brick wall with my own basic diagnostics, and google didn't
help me very much either.
Any pointers would be appreciated...
David
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