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Full Discussion: Context-switching - vmstat
Homework and Emergencies Homework & Coursework Questions Context-switching - vmstat Post 302461439 by methyl on Monday 11th of October 2010 07:48:46 AM
Old 10-11-2010
I believe that you are doing the correct calculations, though the sample time is much too short to be meaningful.

As long as you are the sole user of the computer on which you ran "vmstat" we could deduce that your Ruby session was not a major hit on that particular system resource. So what?

Personally I could not deduce anything significant from these statistics with such a small sample.

Now, if you ran a process for an hour and could see a distinct change in context switches that might be worth investigating.


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LEARN ABOUT OSX

syscallbypid.d

syscallbypid.d(1m)						   USER COMMANDS						syscallbypid.d(1m)

NAME

       syscallbypid.d - syscalls by process ID. Uses DTrace.

SYNOPSIS

       syscallbypid.d

DESCRIPTION

       This  reports  the  number  of  each  type of system call made by PID.  This is useful to identify which process is causing the most system
       calls.

       This is based on a script from DExplorer.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       This samples until Ctrl-C is hit.
	      # syscallbypid.d

FIELDS

       PID    process ID

       CMD    process name

       SYSCALL
	      system call name

       COUNT  number of system calls made in this sample

DOCUMENTATION

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       syscallbypid.d will sample until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       procsystime(1M), dtrace(1M), truss(1)

version 1.00							   Jun 28, 2005 						syscallbypid.d(1m)
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