apache process query.

**nikhil** · 03-04-2004

Does the number of apache processes that run on startup differ depending upon the apache version and the operating system that is present.

For example...apache1.3 on redhat8 shows total 8 processes
apache2 on redhat9 shows 10 processes running.

any idea why the no of processes change?

**jasonlambert** · 03-04-2004

you can specify the number of apache processes in the httpd.conf config file, i dont believe it has anything at all to do with the distro/version you are using.

Jason

**nikhil** · 03-05-2004

which parameter do I have to modify to do that?

**Dolda2000** · 03-07-2004

There are in fact lots of parameters. Here is the relevant excerpt of the config file, with the original comments that explain the parameters (from Apache 2):

Code:

##
## Server-Pool Size Regulation &#40;MPM specific&#41;
## 

# prefork MPM
# StartServers&#58; number of server processes to start
# MinSpareServers&#58; minimum number of server processes which are kept spare
# MaxSpareServers&#58; maximum number of server processes which are kept spare
# MaxClients&#58; maximum number of server processes allowed to start
# MaxRequestsPerChild&#58; maximum number of requests a server process serves
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
MaxClients 150
MaxRequestsPerChild 100
</IfModule>

# worker MPM
# StartServers&#58; initial number of server processes to start
# MaxClients&#58; maximum number of simultaneous client connections
# MinSpareThreads&#58; minimum number of worker threads which are kept spare
# MaxSpareThreads&#58; maximum number of worker threads which are kept spare
# ThreadsPerChild&#58; constant number of worker threads in each server process
# MaxRequestsPerChild&#58; maximum number of requests a server process serves
<IfModule worker.c>
StartServers         2
MaxClients         150
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     25 
MaxRequestsPerChild  0
</IfModule>

# perchild MPM
# NumServers&#58; constant number of server processes
# StartThreads&#58; initial number of worker threads in each server process
# MinSpareThreads&#58; minimum number of worker threads which are kept spare
# MaxSpareThreads&#58; maximum number of worker threads which are kept spare
# MaxThreadsPerChild&#58; maximum number of worker threads in each server process
# MaxRequestsPerChild&#58; maximum number of connections per server process
<IfModule perchild.c>
NumServers           5
StartThreads         5
MinSpareThreads      5
MaxSpareThreads     10
MaxThreadsPerChild  20
MaxRequestsPerChild  0
</IfModule>

**nikhil** · 03-08-2004

yeah I saw that part of the file...but what i dont get is that the numbers mentioned in that part is not equal to the actual no of processes that i see running....for example i have 9 processes running when i start apache but i do not see the number 9 in any of those paras...so i was wondering if there is any particular parameter that needs to be modified or maybe thats not the way apache works!!!!

**nikhil** · 03-09-2004

can anyone throw some light on this issue? any idea which parameter has to be modified for manipulating the no of processes that startup at boot time?

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