Date: Wed, 7 Jan 2009 17:29:41 -0800 From: Alfred Perlstein <alfred@freebsd.org> To: craig@animalhead.com Cc: freebsd-threads@freebsd.org Subject: Re: ThreadsPerChild in Apache2 vs THR in top using Event MPM Message-ID: <20090108012941.GX60686@elvis.mu.org> In-Reply-To: <9F36BDB2-36D4-4941-BD05-36D2CC5C77AB@animalhead.com> References: <9F36BDB2-36D4-4941-BD05-36D2CC5C77AB@animalhead.com>
next in thread | previous in thread | raw e-mail | index | archive | help
I think 6.3 uses "libkse" which is N:M threads library, so top(1) can't know how many user threads there are, just kernel threads. Do this: ldd /path/to/httpd If you see libpthread, you're using "kse" and won't see the exact number of threads. -Alfred * craig@animalhead.com <craig@animalhead.com> [090107 17:10] wrote: > This is more of an Apache question than a FreeBSD question, but I've > received no response from enquiries to the users@httpd list. Perhaps > someone receiving from this list will be able to help? > > Our server is running Apache 2.2.11 with the Event MPM under FreeBSD > 6.3, on a site that's largely mod_perl2 driven. > > ThreadsPerChild is specified as 25 in an include file of httpd.conf. > > The documentation of the Worker MPM (which is said to have the same > configuration characteristics as Event) states that each child process > creates <ThreadsPerChild> threads when it starts, and never changes the > number of threads. > > But the THR column of the 'top' utility shows 11 threads per process. > Is 'top' just wrong, or is something constraining how many threads are > being created? Might my Internet Hosting Provider have built FreeBSD > with some such constraint? How can I get more data? > > The only way I know to ask Apache about its threads configuration > is the Apache2::MPM->query facility. Using this facility for all of > the values noted in the Apache2::Const documentation yields: > > MPMQ_MAX_DAEMON_USED(1) = -1 > MPMQ_IS_THREADED(2) = 1 > MPMQ_IS_FORKED(3) = 2 > MPMQ_HARD_LIMIT_DAEMONS(4) = 16 > MPMQ_HARD_LIMIT_THREADS(5) = 64 > MPMQ_MAX_THREADS(6) = 25 > MPMQ_MIN_SPARE_DAEMONS(7) = 0 > MPMQ_MIN_SPARE_THREADS(8) = 25 > MPMQ_MAX_SPARE_DAEMONS(9) = 0 > MPMQ_MAX_SPARE_THREADS(10) = 150 > MPMQ_MAX_REQUESTS_DAEMON(11) = 0 > MPMQ_MAX_DAEMONS(12) = 10 > > MPMQ_MAX_THREADS has the same value as ThreadsPerChild, but > its name suggests that this number is a maximum. Does this imply > that this number may not be created as a child process starts? > > Help will be much appreciated, > cmac > www.animalhead.com > > _______________________________________________ > freebsd-threads@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-threads > To unsubscribe, send any mail to "freebsd-threads-unsubscribe@freebsd.org" -- - Alfred Perlstein
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090108012941.GX60686>