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Julien
Asked: 2009-09-03 06:33:28 +0800 CST

What values to set for Apache 2 worker server pool management?

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I recently switched from Apache 2.2 prefork to Apache 2.2 worker, but I have no idea what would be a great MPM config to start with. On prefork, I used :
MaxClients 256
StartServers 190
MinSpareServers 160
MaxSpareServers 220

I'd like to be able to accept at least as much simultaneous requests (190)

Thanks !

PS: Server environment: Debian 5.0, 2x 3.00 Ghz, 4 GB RAM, dedicated to Apache.

performance debian apache-2.2 configuration mpm-worker

2 Answers

  1. ServerLimit 256
MaxClients 256
StartServers 19
ThreadsPerChild 10
MinSpareThreads 160
MaxSpareThreads 220
MaxRequestsPerChild 10000

    This will:

    • Start 190 threads when httpd starts
    • Serve up to 256 simultaneous requests
    • Ensure a min of 160 spare threads
    • Limit a max of 220 spare threads
    • Limit each httpd child process to serving 10,000 requests before replacing it with a new child process. This helps prevent hanging up the apache server in case there are memory leaks in the underlying application.
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  2. Best Answer

    Finally, I used the following settings which are working pretty well :

    StartServers 8
MaxClients 1024
MinSpareThreads 512
MaxSpareThreads 1024
ThreadsPerChild 64
MaxRequestsPerChild 10000

    I chose greater values since the memory footprint is supposed to be much smaller. I noticed too that when running apachectl configtest (or start/stop) with weird values, it reports the error and auto adjusts the settings.

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