Can you tell me what the syntax is for monitoring a particular cpu core? Currently I have something like the following example:
if cpu usage (user) > 70% then alert How do I specify a particular core? Using "if cpu0 usage (user) > 70% then alert" gave me "/etc/monitrc:111: Error: syntax error 'cpu0'" Thanks, On Fri, May 2, 2008 at 1:43 PM, Martin Pala <[EMAIL PROTECTED]> wrote: > Monit can monitor "unlimited" number of CPUs ... each core is counted as > one CPU (regardless in which socket it sits). CPU usage of multicore and > singlecore machines whether single CPU or SMP can be monitored using > existing monit capabilities. > > Regarding mysql ... it can have several threads and each of these threads > can be scheduled on different core/CPU and run in parallel. You never know > on which core it runs unless you use resource management - for example > Solaris allows you to bind the specific applications to specific resource > pools which can define CPU boundary. Without the resource management, the > process can be switched by the scheduler freely (including thread > migrations). > > > > Martin > > > > [EMAIL PROTECTED] wrote: > > > Thanks, but I don't think that would work. If all four processors were > > above 25%, it would give a false positive. Am I correct in thinking that > > monit doesn't actually have the capability to monitor more than one cpu? > > Maybe this should be a wishlist item? > > > > > > On Tue, Apr 29, 2008 at 12:34 PM, Martin Pala <[EMAIL PROTECTED]<mailto: > > [EMAIL PROTECTED]>> wrote: > > > > Monit is reporting the CPU usage as total (corresponding to first > > example of top). > > > > If the application will get 100% of one core on 4-core system, it's > > CPU usage should be reported by monit is 25% (since 4 * 25% = 100%). > > > > You can thus use rule like this: > > > > if cpu usage > 25% then restart > > > > Martin > > > > > > > > > > [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> wrote: > > > > We have an issue were mysqld hogs up 100% of one of our cpu > > cores from time to time. How can I configure monit to restart > > mysqld when this happens. > > For an example of what I am talking about, top normally shows > > only one cpu but if you press '1' it will show all the cpus. > > (normal top) > > top - 18:13:11 up 10 days, 21:59, 1 user, load average: 1.56, > > 1.81, 2.08 > > Tasks: 186 total, 5 running, 181 sleeping, 0 stopped, 0 > > zombie > > Cpu(s): 31.6% us, 7.6% sy, 0.0% ni, 60.8% id, 0.0% wa, 0.0% > > hi, 0.0% si > > > > (top after pressing '1') > > top - 18:13:54 up 10 days, 22:00, 1 user, load average: 1.73, > > 1.81, 2.07 > > Tasks: 185 total, 3 running, 182 sleeping, 0 stopped, 0 > > zombie > > Cpu0 : 29.4% us, 5.9% sy, 0.0% ni, 63.9% id, 0.7% wa, 0.0% > > hi, 0.0% si > > Cpu1 : 27.9% us, 5.6% sy, 0.0% ni, 65.5% id, 1.0% wa, 0.0% > > hi, 0.0% si > > Cpu2 : 23.1% us, 5.7% sy, 0.0% ni, 70.6% id, 0.7% wa, 0.0% > > hi, 0.0% si > > Cpu3 : 25.3% us, 6.2% sy, 0.0% ni, 67.5% id, 1.0% wa, 0.0% > > hi, 0.0% si > > > > (sample when mysqld is hogging cpu time) > > top - 18:13:54 up 10 days, 22:00, 1 user, load average: 1.73, > > 1.81, 2.07 > > Tasks: 185 total, 3 running, 182 sleeping, 0 stopped, 0 > > zombie > > Cpu0 : 100 % us, 5.9% sy, 0.0% ni, 63.9% id, 0.7% wa, 0.0% > > hi, 0.0% si > > Cpu1 : 7.9% us, 5.6% sy, 0.0% ni, 65.5% id, 1.0% wa, 0.0% > > hi, 0.0% si > > Cpu2 : 3.1% us, 5.7% sy, 0.0% ni, 70.6% id, 0.7% wa, 0.0% > > hi, 0.0% si > > Cpu3 : 5.3% us, 6.2% sy, 0.0% ni, 67.5% id, 1.0% wa, 0.0% > > hi, 0.0% si > > > > So, how do I get monit to restart mysqld when just one cpu is > > pegged at 100%? It's not always Cpu0, it could be any of them. > > > > Thanks, > > > > > > > > ------------------------------------------------------------------------ > > > > -- > > To unsubscribe: > > http://lists.nongnu.org/mailman/listinfo/monit-general > > > > > > > > -- > > To unsubscribe: > > http://lists.nongnu.org/mailman/listinfo/monit-general > > > > > > > > ------------------------------------------------------------------------ > > > > -- > > To unsubscribe: > > http://lists.nongnu.org/mailman/listinfo/monit-general > > > > > -- > To unsubscribe: > http://lists.nongnu.org/mailman/listinfo/monit-general >
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