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Hi.
I recently had the chance to look at version 2.9 of NSCA. We were originall=
y 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 want=
s (up to the socket listener limit, but that is still quite a bit of proces=
ses) 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 doe=
sn'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 th=
ey exit for some errors. In my opinion, this should have better scalability=
than the single-threaded mode and better resources usage behavior when han=
dling many messages per second. This is imitating the mpm_prefork worker fo=
r "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 goo=
d results for now.
Any comments are welcome, if you want to include the patch upstream, feel f=
ree as I would be glad to have contributed to that project.
The included patch applies clean on nsca-trunk; revision 1846.
---
Michel Belleau
--_002_A5DD33C05033144FBB1D507F8D3A56A834A94AF172QCVXMP01wwcor_
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Content-Description: nsca_29-prefork.patch
Content-Disposition: attachment; filename="nsca_29-prefork.patch"; size=6553;
creation-date="Tue, 06 Dec 2011 22:16:26 GMT";
modification-date="Tue, 06 Dec 2011 22:35:22 GMT"
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...[email truncated]...
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