Antwort: Re: Perf-Problem - Not more than 255 Childs?

[Andreas Ericsson]

h.baecker at ecofis.de wrote:
> I'm sorry, this is not the answer because the system doesn't swap heavily 
> and the memory is ok too.
> 
> But I think there are some Kernel limits to 255 Procesess...
> 
> ###
> less /usr/src/linux/include/linux/limits.h
> [...]
> #define OPEN_MAX         256    /* # open files a process may have */
> [...]
> ###
> 
> We will try to fix this in a few days...
> 

Please, please, please don't hack the kernel. The limits in it are there 
for a reason, and shouldn't be tampered with to fix broken applications.

If nagios could be set up to print its perfdata to a local socket (maybe 
it already can?) then heavy performance issues with forking a 
child-process to write perfdata for each check can be done away with. 
This would also take care of the issues with data-loss.

If you're going to do some hacking, I suggest you start in Nagios, and 
then email Ben (Clewett, the PerfParse guy) what changes you've done so 
he can make adjustments for the improvements.

> Thanks
> 
> 
> 
> 
> Marco Ramos <mramos at co.sapo.pt> 
> 18.06.2004 13:25
> 
> An
> h.baecker at ecofis.de
> Kopie
> nagios-users at lists.sourceforge.net
> Thema
> Re: [Nagios-users] Perf-Problem - Not more than 255 Childs?
> 
> 
> 
> 
> 
> 
> 
> This should be the answer to your problem:
> 
> http://www.nagios.org/faqs/viewfaq.php?faq_id=115
> 
> HTH,
> mramos
> 
> On Fri, 2004-06-18 at 10:15, h.baecker at ecofis.de wrote:
> 
>>Hi List,
>>
>>I have som performance Problems with my Nagios. It is running on an
>>IBM Server with following specs:
>>
>>CPU Info:
>>4 x                 Intel(R) XEON(TM) CPU 2.00GHz
>>
>>Mem Info:
>>        total:                    used:                free: 
>>shared:         buffers:          cached:
>>Mem:  2649300992         2368167936         281133056        0 
>>672956416         949780480
>>Swap: 1081470976         48660480         1032810496
>>
>>I think it is not a small system.
>>
>>All about we've got 613 Hosts and 2600 Services.
>>
>>I would say that 99% of the service checks have an check_interval =
>>600 seconds.
>>
>>The Process Info says that just 75% of the whole checks where checked
>>within a 5 minute intervall.
>>
>>During my examine of nagios and system I found out that max 255
>>procesess owned by nagios with service checks etc. Is there a limit of
>>maximum procs?
>>or:
>>How can I optimize Nagios to check all of the Services within 5
>>minutes? Any ideas?
>>
>>Thanks for hopefully a much of answers.
>>
>>Hendrik
> 
> 
> 
> 
> 

-- 
Sourcerer / Andreas Ericsson
OP5 AB
+46 (0)733 709032
andreas.ericsson at op5.se


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