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Re: [monit] Quad Core Monitoring

From: Scott Silva
Subject: Re: [monit] Quad Core Monitoring
Date: Mon, 05 May 2008 07:56:51 -0700
User-agent: Thunderbird (Windows/20080421)

on 5-2-2008 2:10 PM Martin Pala spake the following:
As mentioned ... monit watches the CPU resources of the whole system (sum of all cores/CPUs), it's not possible to monitor particular core/CPU.

Monitoring single core doesn't make sense i think, since on timesharing system without mentioned resource management can any process run on any CPU. Scheduler can switch the process/thread to any core. If your mysql has multiple threads (almost certainly has), it's not running on one core unless you use resource management to dedicate part of the HW.

Why do you need to watch single core on SMP system? It's like watching single DIMM usage ... your mysql process can be migrated to any core, if you'll define the CPU usage as 25%, it corresponds to eating CPU resources corresponding to one core on 4-core system.

I see his point. If all four cores are running at say 40 or 50%, while perfectly valid usage on a busy system, it would trigger on the "25%" test and restart mysql for nothing.

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