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Full Discussion: Checking Unix Performance - Why is a process running slowly?
Top Forums UNIX for Dummies Questions & Answers Checking Unix Performance - Why is a process running slowly? Post 302442505 by bluejayek on Wednesday 4th of August 2010 01:16:33 PM
Old 08-04-2010
Usually I only use top.
Top will display a chart that is updated frequently (every second by default on my machine).
It gives the CPU usage, % used by the user, % by the system, and % idle.

In the chat it will tell you what % of the cpu each process is using, and how much processor time it has consumed up until that point (that is the 4th column named time). It also gives information on memory usage, current state, PID, user, and such.
It is a very useful utility and should get you what you need to know.

One thing to note that I have found with multicore processors. The % cpu use on each process is a % of a single core. Thus with a quad core you can have two processes using 100% and still have the total cpu use read as 50%.

Hope this helps.
 

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LEARN ABOUT NETBSD

pmc

PMC(1)							    BSD General Commands Manual 						    PMC(1)

NAME

     pmc -- performance-monitoring counter interface for command execution

SYNOPSIS

     pmc -h
     pmc -C
     pmc -c event command [options ...]

DESCRIPTION

     pmc is a means of using a processor's performance-monitoring counter (PMC) facility to measure various aspects of a program's execution.  It
     is meant to be used in a fashion similar to time(1).

     The arguments are as follows:

     -h      Display a list of performance counter events available on the system.

     -C      Cancel any performance counters that are currently running.

     -c event
	     Count the event specified by event while running the command.

DIAGNOSTICS

     PMC support is not compiled into the kernel  Performance-monitoring counter support has not been compiled into the kernel.  It may be
     included using the PERFCTRS option.  See options(4) for details.

     PMC counters are not supported by CPU  Performance-monitoring counters are not available for the CPU.

SEE ALSO

     time(1), options(4)

HISTORY

     The pmc command first appeared in NetBSD 1.6.

AUTHORS

     The pmc command was written by Frank van der Linden <fvdl@wasabisystems.com>.  The kernel support for reading performance counters on the
     i386 architecture was written by
     Jason R. Thorpe <thorpej@zembu.com>.

BUGS

     The pmc command currently only supports performance-monitoring counters on the i386 architecture.

BSD
								 October 24, 2000							       BSD
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