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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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 Posted: Wed 10 Aug '11 13:03 Post subject: Way to decrease Apache I/O Writes ? |
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Since few days i'm working on decreasing I/O Writes by Apache on my heavy traffic site (more than 500 req/s). I turned off all possible logs (imho this was the main reason of I/O writes - i started from around 100 I/O writes/s) - as Apache is fronting JBoss application server the only logs currently enabled are mod_jk logs (with bin/rotatelogs).
I'm still experiencing 50 I/O writes every second - is there any way to decrease this value and save hardware resources for JBoss (config, system tweak or maybe some apache module)?
OS : Win2k8 R2 Enterprise x64
Apache : Apache/2.2.17 (Win32) mod_ssl/2.2.17 OpenSSL/0.9.8o mod_jk/1.2.25 |
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Kanashii
Joined: 17 Jul 2006
Posts: 155
Location: Porando
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| Posted: Wed 10 Aug '11 14:39 Post subject: |
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In my case:
Apache turn off Login for static files
use Wincache and cache file in memory eq template files
Move session from disc to memcached
Turn off httpacess and move to http.conf
use mod_mem_cache for apache
//Witam na forum |
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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| Posted: Wed 10 Aug '11 16:36 Post subject: |
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| Kanashii wrote: | In my case:
Move session from disc to memcached
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What does it mean ? Could you put config example to achieve it ?
| Kanashii wrote: | In my case:
//Witam na forum
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Też witam  |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7355
Location: Germany, Next to Hamburg
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| Posted: Wed 10 Aug '11 17:51 Post subject: |
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| Quote: |
Move session from disc to memcached
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I don't know if this applies in this case. Cause if you use apache only as reverse proxy and don't run any applications on it the session however it is stored will be on the backend server not on apache.
Did you disable the error logging?
-- edit ---
did you try to use mod_proxy_ajp instead of mod_jk?
Did you set ExtendedStatus Off ? Disabled DNS lookup? Enabled deflate?
Options -Indexes FollowSymLinks |
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Kanashii
Joined: 17 Jul 2006
Posts: 155
Location: Porando
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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| Posted: Wed 10 Aug '11 21:49 Post subject: |
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| James Blond wrote: |
Did you disable the error logging?
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No, but error frequency is so low that i think there is no need to disable it.
| James Blond wrote: |
did you try to use mod_proxy_ajp instead of mod_jk?
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I have compared it many times and i didn't find any reason to switch to mod_proxy_ajp.
| James Blond wrote: |
Did you set ExtendedStatus Off ?
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No i did not.
| James Blond wrote: |
Disabled DNS lookup?
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Yes.
| James Blond wrote: |
Enabled deflate?
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Yes with disabled logging.
| James Blond wrote: |
Options -Indexes FollowSymLinks
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?? |
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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| Posted: Wed 10 Aug '11 21:56 Post subject: |
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| Kanashii wrote: | | I mean PHP session - you can config in php.ini |
I do not use php.
No.
| Kanashii wrote: |
Also Apache had some problem with Vary if eq css or js are gziped and some client use nogzip its every time read from disc.
So i had for css|js
Header unset Vary |
Could you provide piece of config how you set it up ? |
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Kanashii
Joined: 17 Jul 2006
Posts: 155
Location: Porando
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| Posted: Thu 11 Aug '11 1:11 Post subject: |
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| Quote: |
<FilesMatch "\.(css|js)$">
Header set Cache-Control "max-age=2592000, public"
Header set X-FRAME-OPTIONS "DENY"
#Header unset Last-Modified
SetOutputFilter DEFLATE
#8640 - jeden dzien
Header unset Vary
#Header unset User-Agent
#Header unset Pragma
</FilesMatch>
TraceEnable off
FileETag MTime Size
EnableSendfile Off
EnableMMAP Off
Win32DisableAcceptEx
TraceEnable Off
UseCanonicalName Off
ServerSignature Off
HostnameLookups Off
SendBufferSize 0
<Location /status>
SetHandler server-status
Header set Expires "Tue, 12 Sep 1999 12:12:12 GMT"
Order Deny,Allow
Deny from all
Allow from 127.0.0.1
</Location>
# ANTI FINGERPRINT
SetEnvIf Request_Method . BR_http=y
SetEnvIf Request_Method . BR_get=y
SetEnvIf Request_Protocol HTTP\/1\.0$ !BR_http
SetEnvIf Request_Protocol HTTP\/1\.1$ !BR_http
SetEnvIf Request_Method GET !BR_get
SetEnvIf BR_http y BadRequest=y
SetEnvIf BR_get y BadRequest=y
<limit TRACK>
deny from all
</limit>
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Last edited by Kanashii on Thu 11 Aug '11 18:12; edited 1 time in total |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7355
Location: Germany, Next to Hamburg
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| Posted: Thu 11 Aug '11 10:01 Post subject: |
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| Qmpeltaty wrote: |
| James Blond wrote: |
Did you set ExtendedStatus Off ?
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No i did not.
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If you serve any files from the harddrive apache is installed on. apache will make several extra time-related system calls on every request made.
| Qmpeltaty wrote: |
| James Blond wrote: |
Options -Indexes FollowSymLinks
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?? |
This applies only if you serve any files from the harddrive apache is installed on. The same thing like the .htacces thing. Apache will look into each directory for an index file, if not it will desplay the content of that directory. See http://httpd.apache.org/docs/2.2/en/mod/core.html#options |
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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| Posted: Thu 11 Aug '11 11:47 Post subject: |
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| James Blond wrote: | | Qmpeltaty wrote: |
| James Blond wrote: |
Did you set ExtendedStatus Off ?
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No i did not.
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If you serve any files from the harddrive apache is installed on. apache will make several extra time-related system calls on every request made.
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Applied.
| James Blond wrote: |
| Qmpeltaty wrote: |
| James Blond wrote: |
Options -Indexes FollowSymLinks
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?? |
This applies only if you serve any files from the harddrive apache is installed on. The same thing like the .htacces thing. Apache will look into each directory for an index file, if not it will desplay the content of that directory. See http://httpd.apache.org/docs/2.2/en/mod/core.html#options |
I know how it works and have it applied - i thought you post it by mistake. |
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Steffen
Moderator
Joined: 15 Oct 2005
Posts: 3093
Location: Hilversum, NL, EU
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| Posted: Sat 13 Aug '11 15:00 Post subject: |
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An other which may give more efficient disk access and hence higher performance:
BufferedLogs On
This directive causes mod_log_config to store several log entries in memory and write them together to disk, rather than writing them after each request.
Steffen |
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Kanashii
Joined: 17 Jul 2006
Posts: 155
Location: Porando
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| Posted: Sat 13 Aug '11 20:31 Post subject: |
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BufferedLogs On
When enabled:
log-%m-%d-%Y.txt
should be
log-08-13-2011.txt
I think some problem with mod_log rotation |
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