DO NOT REPLY [Bug 22516] - Apache 2 crashes with Acept Mutex error when stressed with 20 users on HP-UX 11.00

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Apache 2 crashes with Acept Mutex error when stressed with 20 users on HP-UX 11.00





------- Additional Comments From trawick@apache.org  2003-08-18 14:27 -------
What kind of accept mutex are you using?

To determine this:

1st see if there is an AcceptMutex directive in your configuration file
if not, the output of "apachectl -V" tells what is the compiled-in default

I think it will say

 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE

which means that SysV semaphores are used for cross-process locks
and pthread mutexes are used for intra-process locks

meanwhile, ENOSPC (no space left on device) is an error associated with SysV
semaphores, and it has nothing to do with available filesystem space

Assuming you're really using SysV semaphores:

a) the problem may be some OS tuning issue...  increase any system tuning
associated with SysV sems until the problem goes away
b) if you can't get it tuned properly, switch to a different mutex mechanism,
such as fcntl, by putting something like this in your config file:

  AcceptMutex fcntl

Note that fcntl mutexes have their own issues.  For starters, if your server
root is on a remote filesystem, you'll need to use the LockFile directive.

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