Hello Tom, as you mentioned I need to do stress test of the application. How to do that for SSL connection? best regards Petr Dne 18. října 2011 13:59 Tom Evans <tevans.uk@xxxxxxxxxxxxxx> napsal(a): > On Tue, Oct 18, 2011 at 12:11 PM, Petr Hracek <phracek2@xxxxxxxxx> wrote: >> Dear users, >> >> There are run most AJAX requests. After increasing the values >> StartServers 15 >> MinSpareServers 10 >> MaxSpareServers 30 >> >> ==> error_log <== >> [Tue Oct 18 11:25:59 2011] [info] server seems busy, (you may need to >> increase StartServers, or Min/MaxSpareServers), spawning 8 children, >> there are 0 idle, and 23 total children >> [Tue Oct 18 11:26:00 2011] [info] server seems busy, (you may need to >> increase StartServers, or Min/MaxSpareServers), spawning 16 children, >> there are 7 idle, and 31 total children >> >> Can there be a problem that AJAX objects did not close the connections properly? >> >> Thank you in advance >> > > Anything is possible, but no, that is unlikely. > > Do you have more of these messages in the log? It looks like you don't > start enough children to serve your peak load. These two log entries > show that your server started with 15, and within a few seconds > started an additional 16 children, indicating that you need to > increase your StartServers. > > Forking isn't free, so you will want to start as many child processes > as you will probably need, and allow them to stay alive rather than > killing them off when you get quiet, just to respawn them again when > you are busy. The trade-off from doing this is that each child > consumes memory. > > Therefore: > > Set StartServers and MaxSpareServers to the same value, and increase > both until you don't get these messages - we increase MaxSpareServers > so that it doesn't just kill them all off in quiet periods. > > Once you have found how many server children you need, set > StartServers to that value, MaxSpareServers to maybe 80% of that > value, and MinSpareServers to about 10% of that value. > > The next step is working out how many server children is too many. To > do this, you need to stress test your application, trying to get it > super busy - basically, in fact, until Apache croaks that you need to > increase MaxClients. > > Stop the test, increase MaxClients (if you increase it above 256, you > also need to increase ServerLimit), repeat test. Do this until your > server runs out of memory/CPU/disk - that is your absolute limit to > number of server children. I'd normally step back a bit from that, to > allow some overhead. > > As an example, one of our busy apache servers has StartServers 200, > MinSpareServer 20, MaxSpareServers 160, MaxClients 512, ServerLimit > 512. When we approach MaxClients, the box is approaching running out > of memory. > > Hope that helps > > Cheers > > Tom > > --------------------------------------------------------------------- > 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 > > -- Best Regards / S pozdravem Petr Hracek --------------------------------------------------------------------- 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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