Hello list,
I am wondering if anyone has some suggested values for kernel message queue
parameters when using the latest NDOUtils 1.5. These are required after the
async patch
[http://exchange.nagios.org/directory/Patches/NDOUtils/ndoutils-2Dasync/details]
by andree was added. Within seconds I after the upgrade I was getting a full
message queue with many hundred "Error: queue send error" errors.
I tweaked my kernel parameters through trial and error to be (extremely?) large
values and am no longer seeing any 'queue send' and 'queue recv' errors.
Though I am concerned about consequences with running these large values. Any
sane suggestions? Or maybe these parameters are within "sane" limits?
I increased my parameters (in /etc/sysctl.conf and applied by `/sbin/sysctl
-p`) to allow:
kernel.msgmax = 131072000
kernel.msgmnb = 131072000
kernel.msgmni = 65536000
kernel.sem = 5000 4120000 32 20480
This results in a major increase (as viewed from `ipcs -l`):
------ Semaphore Limits --------
max number of arrays = 128 => 20480
max semaphores per array = 250 => 5000
max semaphores system wide = 32000 => 4120000
max ops per semop call = 32 => 32
semaphore max value = 32767 => 32767
------ Messages: Limits --------
max queues system wide = 1024 => 6553600
max size of message (bytes) = 65536 => 13107200
default max size of queue (bytes) = 65536 => 13107200
My configuration has about 1,500/20,000 Hosts/Services and running about
1,100/6,900/11,300 total checks (every 1/5/15 minutes) through Nagios Core
3.3.1. The machine is a decent quad core, 10gigs RAM, Fedora 11 server with
Nagios and related processes set to run mainly from a RAM disk. The current
performance is great.
Mark Young
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