----- "alin vasile" <alinachegal...@yahoo.com> wrote: > > Maybe they die due to MaxSpareThreads though. Try setting it equal > > to MaxClients. > > > Thanks Eric, I put MaxSpareThreads to be 15% of MaxClients and > changed the > restarting behaviour. Is there a formula or some guidelines for this > directive?
For MaxClients, yes: http://wiki.apache.org/httpd/PerformanceScalingUp#Sizing_MaxClients For everything else: Yesno. It's easier to make these statements for a preforking deamon, so I'll start from there: Generally you should see to spawning all your children at server startup and have as little as possible fluctuation, i.e.: insensible killing off and spawning of children, just because of your fancy values. MaxClients is the most important tool you have in your box, with this you can define the size of the server. The others help you triangulate the responsiveness. MaxRequestsPerChild, in the end, determines how much a child will be allowed to be blown in memory, when it leaks, and again, adds a new parameter in the killing off and spawning new children equation. Coming back to reality, lets take a look at the default values for worker mpm, as per: https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/extra/httpd-mpm.conf.in <IfModule mpm_worker_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 25 MaxConnectionsPerChild 0 </IfModule> That means: We spawn 2 children, each with 25 threads, readily available. When necessary, the children will spawn up to 75 threads, each. 75 MaxSpareThreads * 2 StartServers == 150 MaxClients If one child dies, worker MPM will spawn new one. If one child reaches MaxConnectionsPerChild, worker MPM will spawn a new one. Worker MPM will *never* spawn more than StartServers children. I hope that helps lift some fog. so long, i -- Igor Galić Tel: +43 (0) 664 886 22 883 Mail: i.ga...@brainsware.org URL: http://brainsware.org/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org " from the digest: users-digest-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
