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Full Discussion: Test command
Top Forums Shell Programming and Scripting Test command Post 302399076 by methyl on Friday 26th of February 2010 07:55:48 AM
Old 02-26-2010
The syntax for "ps" varies, as does the output. Please post which Operating System you have.

Btw. When you have multiple CPUs the percentage from "ps" is a percentage of one CPU. Thus a single process could run at 100% CPU without having any adverse effect. The more CPUs you fit to the computer the more likely you are to see processes with a very high CPU percentage.

Detecting a looping process is a fine art and I don't think that a single snapshot of the CPU percentage is useful for deciding whether to kill a process. It is unlikely that you would come up with a single command line which would be safe to run in a commerical environment.

A perfectly sized and perfectly tuned computer would have everything running at 100% with no wait states.
 

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LEARN ABOUT MOJAVE

mpstat

MPSTAT(1)							Linux User's Manual							 MPSTAT(1)

NAME

       mpstat - Report processors related statistics.

SYNOPSIS

       mpstat [ -A ] [ -I { SUM | CPU | SCPU | ALL } ] [ -u ] [ -P { cpu [,...] | ON | ALL } ] [ -V ] [ interval [ count ] ]

DESCRIPTION

       The  mpstat  command  writes  to  standard output activities for each available processor, processor 0 being the first one.  Global average
       activities among all processors are also reported.  The mpstat command can be used both on SMP and UP machines, but  in	the  latter,  only
       global average activities will be printed. If no activity has been selected, then the default report is the CPU utilization report.

       The  interval parameter specifies the amount of time in seconds between each report.  A value of 0 (or no parameters at all) indicates that
       processors statistics are to be reported for the time since system startup (boot).  The count parameter can  be	specified  in  conjunction
       with  the interval parameter if this one is not set to zero. The value of count determines the number of reports generated at interval sec-
       onds apart. If the interval parameter is specified without the count parameter, the mpstat command generates reports continuously.

OPTIONS

       -A     This option is equivalent to specifying -I ALL -u -P ALL

       -I { SUM | CPU | SCPU | ALL }
	      Report interrupts statistics.

	      With the SUM keyword, the mpstat command reports the total number of interrupts per processor.  The following values are displayed:

	      CPU
		     Processor number. The keyword all indicates that statistics are calculated as averages among all processors.

	      intr/s
		     Show the total number of interrupts received per second by the CPU or CPUs.

	      With the CPU keyword, the number of each individual interrupt received per second by the CPU or CPUs is displayed.

	      With the SCPU keyword, the number of each individual software interrupt received per second by the CPU or CPUs  is  displayed.  This
	      option works only with kernels 2.6.31 and later.

	      The ALL keyword is equivalent to specifying all the keywords above and therefore all the interrupts statistics are displayed.

       -P { cpu [,...] | ON | ALL }
	      Indicate	the  processor	number for which statistics are to be reported.  cpu is the processor number. Note that processor 0 is the
	      first processor.	The ON keyword indicates that statistics are to be reported for every online processor, whereas  the  ALL  keyword
	      indicates that statistics are to be reported for all processors.

       -u     Report CPU utilization. The following values are displayed:

	      CPU
		     Processor number. The keyword all indicates that statistics are calculated as averages among all processors.

	      %usr
		     Show the percentage of CPU utilization that occurred while executing at the user level (application).

	      %nice
		     Show the percentage of CPU utilization that occurred while executing at the user level with nice priority.

	      %sys
		     Show  the	percentage  of CPU utilization that occurred while executing at the system level (kernel). Note that this does not
		     include time spent servicing hardware and software interrupts.

	      %iowait
		     Show the percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.

	      %irq
		     Show the percentage of time spent by the CPU or CPUs to service hardware interrupts.

	      %soft
		     Show the percentage of time spent by the CPU or CPUs to service software interrupts.

	      %steal
		     Show the percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was	servicing  another
		     virtual processor.

	      %guest
		     Show the percentage of time spent by the CPU or CPUs to run a virtual processor.

	      %idle
		     Show the percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request.

	      Note: On SMP machines a processor that does not have any activity at all is a disabled (offline) processor.

       -V     Print version number then exit.

ENVIRONMENT

       The mpstat command takes into account the following environment variable:

       S_TIME_FORMAT
	      If  this	variable  exists and its value is ISO then the current locale will be ignored when printing the date in the report header.
	      The mpstat command will use the ISO 8601 format (YYYY-MM-DD) instead.

EXAMPLES

       mpstat 2 5
	      Display five reports of global statistics among all processors at two second intervals.

       mpstat -P ALL 2 5
	      Display five reports of statistics for all processors at two second intervals.

BUGS

       /proc filesystem must be mounted for the mpstat command to work.

       Only a few activities are given by the Linux kernel for each processor.

FILES

       /proc contains various files with system statistics.

AUTHOR

       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO

       sar(1), pidstat(1), iostat(1), vmstat(8)

       http://pagesperso-orange.fr/sebastien.godard/

Linux								    AUGUST 2011 							 MPSTAT(1)
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