[root@node02 mjs]# ./collectl.pl -scj waiting for 1 second sample... # *** One or more CPUs disabled *** #<--------CPU--------><-----------------Int------------------> #cpu sys inter ctxsw Cpu0 Cpu1 Cpu2 CpuX Cpu4 Cpu5 Cpu6 Cpu7 0 0 1051 49 1000 17 0 0 4 0 0 29
When logging to a file, if any CPUs are found to be offline when collectl starts, that number will be written to the file header in the field CPUsDis. A new flag D will also be added to the Flags field. However, one will still see the same effects of a CPU state change in the output during playback.
If a CPU goes offline after collectl has started and one is logging to disk, it will not be noted in the file header.
When monitoring process data, this header will indicate if a CPU was found to be offline at the time collectl started as well as during processing. However, if the state changes and you're not explicitly displaying CPU data, there will be no indication of dynamic CPU state changes reported.
If you are only monitoring interrupt data and there is a state change things will get very messy. As users typically monitor Interrupts and CPU data at the same time it is not felt to be worth the extra effort or processng overhead to try and accommodate this rare case.
|updated Dec 13, 2011|