Please mention what Operating System and version you have and what Shell or programming language you are using.
If your Operating System has /proc (mine does not) please post representative sample data, a description of the calculation and an example of the output you would expect.
Mathematically your calculation looks unsound.
Percentage CPU time for a PID over elapsed time "t" would be:
Code:
((("CPU time used now by PID") - ("CPU time t seconds ago by PID")) x 100) / ("t seconds")
This assumes that one PID can only use one CPU and assumes that CPU time on your computer is in units of seconds (I don't know anything about your computer or the contents of /proc).
I have written a script that will calculate CPU usage and Memory usage of a particular process on AIX Unix. I know the PID and I am using the command --
# for CPU Usage
MSG_CPU_USG=`ps uax | grep ${PID} | awk {'print $3'}`
#for Memory Usage
MSG_MEM_USG=`ps uax | grep ${PID} | awk {'print... (0 Replies)
hi,
i want to know cpu utilizatiion per process per cpu..for single processor also if multicore in linux ..to use these values in shell script to kill processes exceeding cpu utilization.ps (pcpu) command does not give exact values..top does not give persistant values..psstat,vmstat..does njot... (3 Replies)
Hello Friends,
On one of my Solaris 10 box, CPU usage shows 100% using "sar", "vmstat". However, it has 4 CPUs and prstat and glance are not showing enough processes to justify high CPU utilization.
=========================================================================
$ prstat -a
... (4 Replies)
Hello,
I'm trying to create a shell script (#!/bin/sh) which should tell me the age of a file in minutes...
I have a process, which delivers me all 15 minutes a new file and I want to have a monitoring script, which sends me an email, if the present file is older than 20 minutes.
To do... (10 Replies)
Could you please explain about calculate CPU utilization of aix server using lparstat command?
Here below i have provided example output from aix test server.
System configuration: type=Shared mode=Uncapped smt=On lcpu=4 mem=4096 psize=63 ent=0.50
%user %sys %wait %idle physc %entc ... (1 Reply)
Hi,
I want to calculate the total cpu usage from the sar report. Say for example,
Linux 2.6.24-21-generic (blade10) 09/10/2012
04:54:36 PM CPU %user %nice %system %iowait %steal %idle
04:54:37 PM all 0.00 0.00 0.00 0.00 ... (1 Reply)
Hi All,
I have a script which does report the cpu usuage, there are few output parameter/fields displayed from the script. My problem is I have monitor the output and decide
which cpu number (column 2) has maximum value (column 6).
Since the output is displayed/updated every seconds, it's very... (1 Reply)
We have a single threaded application which is restricted by CPU usage even though there are multiple CPUs on the server, hence leading to significant performance issues. Is it possible to merge / combine multiple CPUs at OS level so it appear as a single CPU for the application? (6 Replies)
Discussion started by: Dissa
6 Replies
LEARN ABOUT PLAN9
cpu
CPU(1) General Commands Manual CPU(1)NAME
cpu - connection to cpu server
SYNOPSIS
cpu [ -h server ] [ -c cmd args ... ]
DESCRIPTION
Cpu starts an rc(1) running on the server machine, or the machine named in the $cpu environment variable if there is no -h option. Rc's
standard input, output, and error files will be /dev/cons in the name space where the cpu command was invoked. Normally, cpu is run in an
81/2(1) window on a terminal, so rc output goes to that window, and input comes from the keyboard when that window is current. Rc's cur-
rent directory is the working directory of the cpu command itself.
The name space for the new rc is an analogue of the name space where the cpu command was invoked: it is the same except for architecture-
dependent bindings such as /bin and the use of fast paths to file servers, if available.
If a -c argument is present, the remainder of the command line is executed by rc on the server, and then cpu exits.
The name space is built by running /usr/$user/lib/profile with the root of the invoking name space bound to /mnt/term. The service envi-
ronment variable is set to cpu; the cputype and objtype environment variables reflect the server's architecture.
FILES
The name space of the terminal side of the cpu command is mounted on the CPU side on directory /mnt/term.
SOURCE
/sys/src/cmd/cpu.c
SEE ALSO rc(1), 81/2(1)BUGS
Binds and mounts done after the terminal lib/profile is run are not reflected in the new name space.
CPU(1)