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From William L.Sebok <...@astro.umd.edu>
Subject general/8826: Threaded mpm creates large number of processes.
Date Wed, 21 Nov 2001 16:30:38 GMT

>Number:         8826
>Category:       general
>Synopsis:       Threaded mpm creates large number of processes.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Nov 21 08:40:00 PST 2001
>Originator:     wls@astro.umd.edu
>Release:        2.0.28
Mandrake 8.0.  gcc-2.96
% uname -a
Linux gaia.astro.umd.edu 2.4.13-p3 #1 Wed Oct 24 11:25:57 EDT 2001 i686 unknown
Configured with:
CFLAGS="-O3 -march=i686" \
 ./configure \
 --prefix=/local/etc/www \
 --with-perl=/usr/bin/perl \
 --enable-mods-shared=all \
I started with the standard httpd-std.conf copied to httpd.conf.  The relevant
parameters were:
<IfModule threaded.c>
StartServers         3
MaxClients         150
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     25
MaxRequestsPerChild  0
83 processes are created.
When (keeping other parameters the same) I reduce START_SERVERS to 1, 29
processes are created.

I was under the impression that the Threaded mpm would create a small number
of processes and field requests with threads inside those processes.  Instead
it creates a very large number of processes more than prefork mpm.  This makes
threaded mode essentially useless for a small server where I would like to keep
the number of processes as small as possible.

I noticed similar behavior in worker mpm.  perchild mpm would not compile.  Is
why preforked mpm is currently default for linux?
See above.

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