Nagios 2.6 still not draining command pipe fast enough

[John P. Rouillard]

In message <45D9C0C6.8030204 at nagios.org>,
Ethan Galstad writes:

>John P. Rouillard wrote:
>> Hi all:
>> 
>> I am trying to get my external correlation engine working with nagios
>> 2.x <http://www.cs.umb.edu/~rouilj/#secnagios>, and I just can't get
>> nagios to drain the command pipe fast enough. I see approx. 5% failure
>> rate on writing to the command pipe with an EAGAIN error.
>> 
>> I have increased:
>> 
>>   nagios.h:#define COMMAND_BUFFER_SLOTS              20480
>>   nagios.h:#define SERVICE_BUFFER_SLOTS             20480
>> 
>> from the original 1024. In the increase of the settings from 10240 to
>> 20480, I may see a slight decrease (maybe .5%), but I think I just want to
>> see it. I don't think it's statistically viable.
>John -  Does this problem still occur with Nagios 2.7 or the latest 2.x 
>CVS code?  A separate command file worker thread should be reading 
>entries from the external command file as fast as it can read them (as 
>long as their are free buffer slots).

I don't know. 2.6 was the latest when I started this. I will build it
later this week and report back.

>If there aren't any external commands, the thread waits 0.5 seconds 
>before checking for new commands in the file.  If you have occasional 
>bursts of check results, this could be too long to wait.  You could try 
>experimenting with decreasing the 0.5 second delay.  Around line 4948 of 
>base/utils.c, you'll find...
>
>/* wait a bit */
>tv.tv_sec=0;
>tv.tv_usec=500000;
>select(0,NULL,NULL,NULL,&tv);
>
>You could try decreasing the value of tv.tv_usec to 100000 (0.1 seconds) 
>and see if that helps at all.

Cool. Thanks. Maybe this is also a tuning parameter that could/should
be exposed in the configuation files?

If I get my external correlation patch working, would you consider
including the patch in the nagios core?

				-- rouilj
John Rouillard
===========================================================================
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