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From "Adrian Marsh" <>
Subject [users@httpd] Apache memory hog
Date Fri, 03 Apr 2009 09:03:05 GMT


I'm trying to track down an issue I have with our apache server.  Its a
poweredge 1800, RHEL5x64 server, running httpd-2.2.3-22.el5.  Its mainly
used as a subversion repository, via HTTPS with LDAP lookup for


All was well with the system, running 1Gb of ram, until I did a yum
update, and also upgraded subversion from 1.4 to 1.5.


Since then, apache consumes vast amounts of RAM, with very little user
interaction.  We've upped the memory to 12Gb of RAM, but even that gets
consumed within a few hours.


Obviously something is eating the ram.


So my questions are:


1) How do I find which module it is in apache thats consuming the ram?
(I'm 99% sure its subversion, but need evidence)


2) The apache docs talk about it having its own memory management, but
what config options are these, and how (roughly) should I be setting


3) When the memory is consumed by httpd, and I stop the httpd process,
it quite often doesnt return the memory to the OS, leaving 11Gb in
"limbo" somewhere.  Is there a way to reclaim this ?




Adrian Marsh


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