Topic: ThreadsPerChild - MaxRequestsPerChild settings

[flatcircle]

Hello

I'm puzzled about those 2 directives.

Can I stick to the default settings for Apache MPM winnt:

ThreadsPerChild 64
MaxRequestsPerChild 0

Or can I adjust these (and how) to tweak performance?
I have changed ThreadsPerChild to 256 but I noticed no change in apache performance. Is a higher value better or not?

Regards.

[James Blond]

The ThreadsPerChild is the number of simultaneous connection apache can handle. That is in most cases not the bottleneck. Often is the the OS. If not windows server the number of connection are limited. Or the limitation if a slow harddisk or not enough RAM.

MaxRequestsPerChild is the number of request the child process do until apache restarts. If you don't have crashes you should keep it to 0 (zero) which means it runs infinite.

One of the questions in my mind is: how many simultaneous connection does your apache handle? Do you serv only static content or dynamic?

[flatcircle]

I'm testing the latest build (Apache 2.2.16) from this site.

I saw that those 2 directives aren't even in httpd.conf so the default is used:

MaxRequestsPerChild 0
ThreadsPerChild 64

I serve a lot of dynamic content. Is there any difference in the directives above when serving static content?

Regards.

[glsmith]

true, defaults are used. they are in conf/extra/httpd-default.conf
I've never needed to change them so can't really answer that.

[James Blond]

Increase ThreadsPerChild can help if you have a server OS and a lot of connection. For dynamic content you need a fast CPU with a lot of cores and a lot of RAM

Well to inscrease the speed it is recommend to serve the static content e.g. pictures / javascript / css from another subdomain. Cause the browser opens only 2 connections to a single domain.

[Kanashii]

My CFG max is 1920

<IfModule mpm_winnt.c>
ThreadsPerChild 1920
MaxRequestsPerChild 0
</IfModule>

No need server edition for windows need only Tweak TCP and some cfg

TCP stack can be change that in nmap show like FreeBSD

netsh interface tcp set global rss=disabled autotuninglevel=disabled
netsh interface ipv4 set subinterface "Internet" mtu=1402 store=persistent
netsh interface tcp set global ecncapability=enabled
netsh int tcp set global rss=enabled
netsh int tcp set heuristics disabled
netsh int tcp set global congestionprovider=ctcp
fsutil behavior query disabledeletenotify

sc.exe config "AudioSrv" start= disabled
sc.exe config "wscsvc" start= disabled
sc.exe config "CscService" start= disabled
sc.exe config "WinDefend" start= disabled


bcdedit /set {default} recoveryenabled No
fsutil behavior query disabledeletenotify
chkntfs/t:4
powercfg.exe /hibernate off


[REGISTRY]

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters]
"TcpMaxPortsExhausted"=dword:00000005
"SynAttackProtect"=dword:00000001
"KeepAliveTime"=dword:00007530
"TcpMaxHalfOpen"=dword:00000190
"TcpTimedWaitDelay"=dword:0000005a
"MaxUserPort"=dword:0000fffe
"TcpNumConnections"=dword:00fffffe

[James Blond]

What are these services you disable? I can identify only Windows Defennder and Windows Audio.

[Kanashii]

sc.exe config "AudioSrv" start= disabled

Windows Audio

sc.exe config "wscsvc" start= disabled

Security center

sc.exe config "CscService" start= disabled

Windows Offline Files Service

sc.exe config "WinDefend" start= disabled

Windows defender