07-15-2011
CPU Usage of a process
Hi guys,
I am currently writing a JAVA script to monitor certain unix processes through JConsole.
Upon having lots of trouble with runtime.exec, i decided to bypass the top/ps command call and just get the information straight from /proc/*pid*/whatever.
Now i can pull back any information from any of the files I want, and the current way i determine the CPU usage of a process is as follows:
Add the UTime and STime of that process from /proc/pid/stat then divide my pidCpu by UTime + STime + NTime from /proc/stat, then multiply that by 100, should give me the % cpu usage a process is using, right?
Theory being if I get the jiffies assigned to my process, I can divide that by the total jiffies the cpu assigns.
However, my results seem to vary from the ones gathered from top and ps. What am I doing wrong?
Any input is appreciated.
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LEARN ABOUT OSX
footprint
footprint(1) BSD General Commands Manual footprint(1)
NAME
footprint -- gathers memory information about a process or set of processes.
SYNOPSIS
footprint -h
footprint -proc <process-name> | -pid <pid> [-proc <process-name> | -pid <pid> [...]]
[-categories | -regions] [-swapped]
[-graphics] [-collapseSharing] [-targetChildren] [-skipIdleExitClean]
[-o <output-file-location>]
[-i <input-file-location>]
DESCRIPTION
footprint provides a summary number and a categorization that describe memory use that most impacts the system.
footprint gathers the sum of dirty/anonymous allocations in one or more processes along with their attributable kernel resources (currently
KPRVT). Shared allocations only contribute to the footprint once, regardless of the number of times that they are mapped into any number of
processes. The "footprint" value represents allocations that will cause the system to page in accommodation.
footprint needs to be run as root. It can target multiple processes via multiple instances of the -proc and -pid flags.
OPTIONS
-categories Detailed output on a per-VM-region type level (medium detail).
-regions Display all memory objects and associated regions that contribute to each category (high detail).
-swapped Display swapped bytes information where applicable.
-graphics Gather graphics data if available (platform dependent, not tallied into footprint total).
-collapseSharing Do not group shared memory output by process.
-targetChildren Gather footprint information for the set of processes launched directly or indirectly by the target processes.
-skipIdleExitClean Do not gather information on any processes that are ready to be quit on memory pressure. Also applicable after the fact
with -i option.
OS X
June 28, 2012 OS X