Thanks a lot for the response. I will do some ab and siege tests to verify it, but I am trying to conceptually understand it first. <IfModule prefork.c> StartServers 5 MinSpareServers 5 MaxSpareServers 20 MaxClients 250 MaxRequestsPerChild 4000 </IfModule> I have at least 20 active apache threads (ps -ef | grep httpd), average is about 40 threads and goes upto 70 at the peak. Does the above setting sounds resonable? Doug Bell-4 wrote: > > On May 27, 2009, at 11:14 PM, CrystalCracker wrote: > >> >> Can anyone explain me how exactly prefork works? >> >> StartServers 2 >> MaxClients 150 >> MinSpareThreads 25 >> MaxSpareThreads 75 >> ThreadsPerChild 25 >> ServerLimit 16 > > Prefork works by spawning one process to handle one connection. So > here, Apache can spawn a maximum of 150 httpd processes (MaxClients is > maximum number of concurrent connections, which in prefork works out > to number of processes). > >> I think I got confused between the terms - server, process and >> thread. If >> prefork is a single thread process, what does that ThreadsPerChild >> mean for >> prefork? > > Prefork is not threaded, so the thread config values do not apply. > >> Lets say, I wan't to support 250 active sessions logged into my >> site, what would be a tentative settings to meet the load? > > > "Active sessions" is difficult to measure. Let's say a person requests > a page which takes 10 seconds, then looks at it for 20 seconds (on > average). This means that you need one httpd process for three users > (the other two people using the 20 seconds the first user isn't using). > > So to get 250 users from these assumptions, we need MaxClients 74. > > I would use "siege" to measure your performance. It has settings for > how many concurrent users, and can attempt to simulate randomness and > "user is reading the page" time. > > Doug Bell -- Senior Developer, Plain Black Corp. > [ http://plainblack.com ] > > > > > --------------------------------------------------------------------- > 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-unsubscribe@xxxxxxxxxxxxxxxx > " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx > For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx > > > -- View this message in context: http://www.nabble.com/How-does-Prefork-work--tp23754946p23768888.html Sent from the Apache HTTP Server - Users mailing list archive at Nabble.com. --------------------------------------------------------------------- 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-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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