Well, some OSs have kernel limits that could be the problem, like "# of allowable processes per uid" or "# of avail file descriptors per uid/process/system", stuff like that. On May 4, 2012, at 3:20 PM, P J wrote: > On Fri, May 4, 2012 at 8:46 AM, Tom Evans <tevans.uk@xxxxxxxxxxxxxx> wrote: > On Fri, May 4, 2012 at 4:18 PM, P J <pauljflists@xxxxxxxxx> wrote: > > On Fri, May 4, 2012 at 5:28 AM, Jim Jagielski <jim@xxxxxxxxxx> wrote: > >> > >> The closer MinSpareServers/MaxSpareServers are, the more time > >> Apache needs to spend killing and creating child processes > >> to ensure it stays within that narrow limit > >> On May 3, 2012, at 2:40 PM, P J wrote: > >> > > > > Thanks. Yes, I understand that. I set them both to that number to try and > > induce the issue we've been seeing. > > If I set: > > > > MinSpareServers 1024 > > MaxSpareServers 2048 > > > > 1000+ simultaneous connections is not uncommon this server. > > > > This is unlikely to have a major effect on your issue, as I believe > something strange is going on when you reach 1024 processes, but why > do you have MinSpareServers so high? > > If you start 1024 children initially, and then 900 of them are busy, > you are asking httpd to ensure there are at least 1924 children. It > seems massive overkill to ensure that there are so many idle > processes. > > If your high water mark is (say) 1536 clients, and you start 1024 > processes, then I would go with settings like this: > > MinSpareServers 128 > MaxSpareServers 1536 > StartServers 1024 > MaxClients 2048 > ServerLimit 2048 > > So, you start with 1024 processes, increasing up to a maximum of 2048 > processes. If there are ever more than 1536 processes idle, kill some > off. > > Cheers > > Tom > > > Thanks Tom, I agree. I don't normally have MinSpareServers at 1024, I was just trying to see if I can force it to throw the: > > "[debug] mpm_common.c(663): (70007)The timeout specified has expired: connect to listener on [::]:80 error". error. > > Which I can. The million $ questions is what is the magic 1024 limit I'm hitting. > > I'll hopefully try with a later version of Apache and let the list know if that resolves it. > > Thanks again. > > -- > PJ --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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