Have you done any stress testing to see what the limitation is before it br=
eaks down? We actually switched back to using xinetd for it for this reaso=
n. We also saw some cases where nsca would hang and take the entire proces=
s with it, so right now if that happens only 1 connection is affected. Las=
t testing we did in this mode we could get about 725,000 connections/hour b=
efore xinetd fell over and stopped working.
Dan
-----Original Message-----
From: Michel Belleau [mailto:[email protected]]=20
Sent: Tuesday, December 06, 2011 4:41 PM
To: [email protected]
Subject: [Nagios-devel] [patch] NSCA version 2.9 pre-forked daemon mode
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
This post was automatically imported from historical nagios-devel mailing list archives
Original poster: ichel Belleau [mailto:[email protected]]=2