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Reply to topic   Topic: Apache process size is ~300MB
Author
gtsongi



Joined: 06 Aug 2015
Posts: 3
PostPosted: Fri 07 Aug '15 11:04    Post subject: Apache process size is ~300MB Reply with quote
Hello,

I was preparing to optimize my Apache configuration. While I was reading around I saw people mentioning Apache process sizes between 10 and 40 MB. When I've checked mine on the server I saw that they are at 300. Basically every running Apache process. What can cause this? Server and Apache specs are:
Server:
CPU: Intel(R) Xeon(R) CPU E5-2609 0 @ 2.40GHz, 2 cores
Real Memory: 8GB
Virtual Memory 2GB
OS: Ubuntu 14

Apache:
Version: 2.4.7

Enabled Apache modules:
access_compat
alias
auth_basic
auth_core
authn_file
authz_core
authz_host
authz_user
autoindex
cgi
deflate
dir
env
filter
mime
mpm_prefork
negotiation
php5
reqtimeout
rewrite
setenvif
socache_shmcb
ssl
status

Apache settings:
Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 5
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 150
MaxRequestsPerChild 0

Can any of these settings or modules cause the process size to increase so much?
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7442
Location: EU, Germany, Next to Hamburg
PostPosted: Fri 07 Aug '15 11:11    Post subject: Reply with quote
That is why I use event mpm and let PHP run over fcgid.

You can use https://raw.githubusercontent.com/jsmoriss/check-httpd-limits/master/check_httpd_limits.pl

to check why your config uses that much memory.

Code:

sudo ./check_httpd_limits.pl --verbose
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gtsongi



Joined: 06 Aug 2015
Posts: 3
PostPosted: Fri 07 Aug '15 11:22    Post subject: Reply with quote
Thanks for the quick reply!
I've tried to run check_httpd_limits, but it only gives me warning about a few missing config variables before exiting with the error: ERROR: Cannot determine httpd version number.
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7442
Location: EU, Germany, Next to Hamburg
PostPosted: Fri 07 Aug '15 11:51    Post subject: Reply with quote
Argh! That is the ubuntu way of things to have the env vars in a different file that is only for the apache2ctl script.

what will work

Code:

sudo su
source /etc/apache2/envvars
./check_httpd_limits.pl --verbose
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gtsongi



Joined: 06 Aug 2015
Posts: 3
PostPosted: Fri 07 Aug '15 12:20    Post subject: Reply with quote
Thank you! This worked perfectly.
I'm just a bit confused by the numbers it is displaying. For example: PID 21852 (apache2) : 25.49 MB / 5.58 MB shared
In Webmin the same process shows 378MB. Which one is the correct number?
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James Blond
Moderator


Joined: 19 Jan 2006
Posts: 7442
Location: EU, Germany, Next to Hamburg
PostPosted: Fri 07 Aug '15 15:51    Post subject: Reply with quote
I think that check_httpd_limits.pl shows the true usage.

the quickest way to check what is true.

Code:
run free -th


stop apache

run free -th again. And see it for yourself how much memory apache consumes. ( Of cause don't forget to start apache again ;) )
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