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 Topic: apache performance issues |
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djxtc
Joined: 24 Mar 2018
Posts: 2
Location: UK, London
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 Posted: Wed 12 May '21 0:06 Post subject: apache performance issues |
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im having severe issues on a server running apache 2.4.6 on centos.
Im running in prefork mode and during high load i can see the processes running in centos are very high and within just a couple of minutes a lot of httpd processes are started.
I have these values configured for prefork
StartServers 40
MinSpareServers 25
MaxSpareServers 100
ServerLimit 600
MaxRequestWorkers 500
MaxConnectionsPerChild 500
KeepAliveTimeout 2
Hardware resources are ok, CPU and MEM are low usage. I cant see any errors in apache log either, clients suddenly cant connect and receive timeout errors.
Any ideas on what might be wrong or needs to be tuned? |
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tangent
Moderator
Joined: 16 Aug 2020
Posts: 312
Location: UK
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| Posted: Wed 12 May '21 21:47 Post subject: |
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Is there a specific reason you're using pre-fork over worker or event MPM's?
The latter two are more efficient under high loads. |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7294
Location: Germany, Next to Hamburg
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| Posted: Wed 12 May '21 21:50 Post subject: |
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Disable the apache status module that is a great boost.
Use worker or event mpm (Both don't run with mod_php, but you can use mod_fcgid for PHP).
Disable DNS lookups.
Enable mod_h(ttp)2 if you can.
Enable and configure mod_deflate.
| Quote: | | MaxConnectionsPerChild 500 |
Why do you kill a child that often? Every 500 requests the parent process will kill a child process and create a new one. That takes time and resources. |
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