Nagios and threads

[Michal Mertl]

Dag-Erling Smørgrav wrote:
> Charles Sprickman <spork at fasttrackmonkey.com> writes:
> > 1. FreeBSD and threads. On FreeBSD there's a native user-level
> > implementation of threads called 'pthread' and there's also an
> > optional ports collection 'linuxthreads' that uses kernel hooks.
> 
> This is only the case for FreeBSD 4.  FreeBSD 5 has native threads.

Yes, the description on Nagios page is not precise but unfortunately
Nagios still has some problems even on 5.4. I wasn't able to find out
what was wrong and the problem dissappeared when I had to replace the
computer with single-processor one. The symptoms I observed were that
every several days one Nagios process was consuming all the CPU doing
hundreds of thousands of syscalls per second. It got always stuck around
the time when the the daily cron job run.

I did a ktrace on the stuck process and tried to abort it to have the
core but I've lost the ktrace output and it never saved the core :-(. 

I'll install it on another machine and try to diagnose the problem some
more.

Michal