Shell – How to Monitor CPU/Memory Usage of a Single Process

monitoringprocessshelltop

I would like to monitor one process's memory / cpu usage in real time. Similar to top but targeted at only one process, preferably with a history graph of some sort.

Best Answer

On Linux, top actually supports focusing on a single process, although it naturally doesn't have a history graph:

top -p PID

This is also available on Mac OS X with a different syntax:

top -pid PID

Related Solutions

Why Process CPU % Usage larger than Total CPU Time

Irix / Solaris Mode(man 1 top):

     <I> :Irix/Solaris_Mode_toggle
          When operating in  'Solaris  mode'  ('I'  toggled  Off),  a
          task's  cpu  usage  will  be divided by the total number of
          CPUs.  After issuing this command, you'll  be  informed  of
          the new state of this toggle.

...

      if 'Irix mode' is Off,  top  will  operate  in
      'Solaris  mode' where a task's cpu usage will be divided by the
      total number of CPUs.  You toggle 'Irix/Solaris' modes with the
      'I' interactive command

Let say N is the total number of CPUs. Then In Irix mode, %CPU is the CPU usage out of N * 100%. In Solaris mode,%CPU is the%CPU in Irix mode / N.

See: Comprehending 'top' CPU usage

EDIT:

the total user cpu time is 43%

I think that you have ignored the %system(Percentage of CPU utilization for executing at the system(kernel) level. ) time. Try other tools like mpstat,iostat and sar for analyzing CPU utilization.

Linux – How to we use the command ‘top‘ to monitor the total CPU usage and each processor usage simultaneously

htop can. But you need setup it at first run for that purpose. For that hit F2 -> and addto left column CPU average bar and all cpus bar.

Best Answer

Related Solutions

Why Process CPU % Usage larger than Total CPU Time

Linux – How to we use the command ‘top‘ to monitor the total CPU usage and each processor usage simultaneously

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