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From Jignesh Badani <jbad...@mmsa.com>
Subject [users@httpd] False "Out of Memory" errors - on new Suse Linux SLES 9.1 - Apache 2.0.54 - Blade servers running 4 GB of RAM
Date Mon, 23 Jan 2006 23:06:00 GMT
Hello all,

We recently migrated from a very stable Solaris 8 /Apache2.0.48/Siteminder 
Web Agent  platform to SLES 9.1 on IBM Blade (Intel) servers running 
Apache 2.0.54 with 4 GB of RAM.

We have 3 load balanced servers and each are running 3 instance of 
Apache2.0.54.

Almost on a daily basis we see "out of memory" errors on the most heavily 
used instance (Dealer Extranet) serving about 5000-7000 users daily and 
about 30-60 simultaneous users (or about 100-150 request).

But when we look at the usage (top or vmstat), there is tonnes of memory 
left (about 2.5GB atleast). We also have configured about 2GB of swap, but 
swap usage is 0k.

We do have any content on this servers apart from the login pages 
(Siteminder Agent), nor we have run any php, perl, etc. Everything is 
proxied back to the backend servers (JAVA/ASP).

We never had this issue on the Solaris running 2.0.48 and the same version 
of Web Agent.

Is there a hidden setting available to tell Apache to use all available 
memory for its processing / caching ? BTW, we do have even mod_cache 
enabled !

Anything I can run to capture some more debug info, could get tricky coz 
it does not happen all the time.

regards
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
- - 
Jignesh Badani
Intranet/Extranet Technical Services


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