Nagios Support Forum

Hi -

Looks like this error is coming back again (nagios: wproc: 'Core Work XXXX' seems to be choked).

Edit: http://support.nagios.com/forum/viewtop ... 12#p125712

The difference is that this time, my cpu utilization is low (around 25% average, 40% max in top - previously it was running full tilt). The system is a 6 core cpu. I added 'check_workers=25' in the nagios.cfg and that seemed to help.

Is this the right fix? I *think* it started after I updated to the latest version (R2.6). Was it because I added more checks?

tonyleatwork wrote:Was it because I added more checks?

Possibly. How many checks (per 5 minutes) are currently being executed?

Upping the workers to 25 increased CPU load (its spiking to 100% from time to time, user + system but still manageable) got rid of the WPROC issues.

Under Monitoring Engine Status:

Active Host Checks
1-min 71

5-min 357

15-min 484

Passive Host Checks
1-min 0

5-min 0

15-min 0

Active Service Checks
1-min 470

5-min 2,530

15-min 3,680

Passive Service Checks
1-min 0

5-min 0

15-min 0

Yes, increasing the check_workers to 25 was the right idea. You should see a smoother line on the event queue graph. (your checks are spread out even in the interval)

Look at the Monitoring Engine Status page: Admin --> System Information --> Monitoring Engine Status

and pay attention to the host and service check latency to see if your checks are waiting too long to run.