[patch] NSCA version 2.9 pre-forked daemon mode

[Michel Belleau]

Hi.

I recently had the chance to look at version 2.9 of NSCA. We were originally running it in "--daemon" mode at our installation, but it looks like the daemon mode is not bounded by any means; NSCA can fork() as much as it wants (up to the socket listener limit, but that is still quite a bit of processes) to process the incoming check results and I didn't like that. I had a look at the "--single" mode of operation and from our tests results, it doesn't scale as much as we need.

I went in and modified the code a bit to implement a PREFORK mode where the NSCA daemon forks a number of processes at startup and respawns them if they exit for some errors. In my opinion, this should have better scalability than the single-threaded mode and better resources usage behavior when handling many messages per second. This is imitating the mpm_prefork worker for "httpd" a bit (much more simplistic though). This adds a new "--prefork" command-line option to NSCA.

I also think that the new "check_result_path" configuration directive is a good performance shortcut, so that is with what I tested it and it gave good results for now.

Any comments are welcome, if you want to include the patch upstream, feel free as I would be glad to have contributed to that project.
The included patch applies clean on nsca-trunk; revision 1846.

---
Michel Belleau

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