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From Igor Katson <descent...@gmail.com>
Subject [users@httpd] Extremely high virtual memory usage
Date Sat, 26 Sep 2009 15:14:14 GMT
I am facing an extremely high virtual memory usage by apache. In fact it 
is not using as much swap space as it shows, but if there are many 
threads, apache starts swapping extensively and the system becomes 
totally unresponsive.

Look at the "VIRT" column (this is the output of top)

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
7449 www-data 20 0 6007m 93m 2760 S 13 1.2 0:06.97 apache2
865 www-data 20 0 5882m 111m 4848 S 0 1.4 0:43.21 apache2
4180 www-data 20 0 5745m 84m 4856 S 0 1.1 0:01.42 apache2
32608 www-data 20 0 5386m 70m 2864 S 0 0.9 0:01.26 apache2
7450 www-data 20 0 5145m 92m 4716 S 17 1.2 0:06.65 apache2
7135 www-data 20 0 5138m 92m 4712 S 14 1.2 0:06.65 apache2
28893 www-data 20 0 5058m 96m 2868 S 0 1.2 0:07.43 apache2
26227 island 20 0 5015m 1.7g 5460 S 0 21.2 1:49.72 java
15773 www-data 20 0 4931m 93m 2828 S 0 1.2 0:17.83 apache2
1124 www-data 20 0 4612m 27m 4832 S 0 0.3 1:39.70 apache2
7018 www-data 20 0 4597m 96m 4844 S 0 1.2 0:24.83 apache2
10690 www-data 20 0 4482m 27m 2860 S 0 0.3 0:00.09 apache2
4811 www-data 20 0 4264m 63m 2868 S 0 0.8 0:00.64 apache2
12061 www-data 20 0 3003m 53m 4832 S 0 0.7 1:07.48 apache2
5164 www-data 20 0 2781m 53m 4832 S 0 0.7 0:00.31 apache2
28266 www-data 20 0 2774m 89m 4816 S 0 1.1 0:26.60 apache2

I tried disabling mod_jk (the most used one, as the backend is tomcat), 
and wsgi (because it is custom built), but the situation is the same. As 
soon as I start apache, some processes are eating around 5 GiB of VIRT 
memory, but as time passes, other apache instances eat virtual memory 
quickly.

How can I debug the problem? What can the possible reasons be?

OS: Debian Lenny, fully up to date
apache2 package version: 2.2.9-10+lenny4
MPM: worker
Enabled modules: alias auth_basic authn_file authz_default 
authz_groupfile authz_host authz_user cache cgid deflate dir disk_cache 
env headers jk mime proxy proxy_http rewrite rpaf setenvif status wsgi

Worker configuration:
<IfModule mpm_worker_module>
StartServers 4
ThreadLimit»»···512
MaxClients 2048
MinSpareThreads 64
MaxSpareThreads 128·
ThreadsPerChild 512
MaxRequestsPerChild 0
</IfModule>

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