I sent the following question to this list a couple of days ago, but
received
no response. So now I ask simply TO WHICH APACHE MAILING LIST
SHOULD I SEND THIS QUESTION, for the best chance of getting 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 such a 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?
Help will be much appreciated,
craig
www.animalhead.com
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