Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

CPU Usage of a process

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting CPU Usage of a process
# 1  
Old 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.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Tricky situation with process cpu usage - AIX

OS: AIX so we frequently receive a lot of cpu related alerts. all types of checks have been created to keep an eye on the cpu but a lot of these checks make too much noise as the CPU is always being seen as high. the system and application owners say there's no issue with the cpu. so now,... (6 Replies)
Discussion started by: SkySmart
6 Replies

2. UNIX for Dummies Questions & Answers

Average CPU and RAM usage for a process

Hi, I will be creating a process myself and I want to know the average CPU and RAM used by the process over the lifetime of the process. I see that there are various tools available(pidstat) for doing , I was wondering if it possible to do it in a single command while creation. Thanks in... (3 Replies)
Discussion started by: koustubh
3 Replies

3. AIX

Problem with nmon, actual CPU usage per process

Hi all, I am currently having trouble to get nmon to print me the actual CPU usage for an interval for a process. According to the manual, something like # time nmon -t -C cron -s 5 -c 2 -F outfile real 0m0.98s user 0m0.03s sys 0m0.04s should print out at least the process... (15 Replies)
Discussion started by: zaxxon
15 Replies

4. AIX

How to trace cpu/memory usage for a process

I don't know when the process will start and end, I need write a script to trace it's cpu/memory usage when it is runing. How to write this script? (2 Replies)
Discussion started by: rainbow_bean
2 Replies

5. UNIX for Advanced & Expert Users

How to find out memory & cpu usage of a process

Hi, By using time command we can determine the execution time of a process or command. bash-2.04$ time ls -l total 0 -rw-r--r-- 1 admin tac 0 Oct 6 04:46 file1 -rw-r--r-- 1 admin tac 0 Oct 6 04:46 file2 real 0m0.002s user 0m0.000s sys 0m0.001s... (5 Replies)
Discussion started by: learn more
5 Replies

6. Shell Programming and Scripting

CPU Usage for a particular process

Hi, I have a shell script. But, upon execution of the same, the cpu usage is sometimes getting 100 % (checked executing top command). At that point of time, my process hangs, doesn't run anymore. I need to kill it manually. My concern is, is there any default method, by which I can check... (1 Reply)
Discussion started by: jitendriya.dash
1 Replies

7. UNIX for Dummies Questions & Answers

process cpu usage

Trying to come up with a command that will show all processes sorted from highest cpu usage to lowest. Any ideas? (9 Replies)
Discussion started by: cwsmichigan
9 Replies

8. UNIX for Advanced & Expert Users

Finding CPU usage by a Unix Process

Hi, I am designing a load balancer for an application. I am trying to find out the CPU usage by a specifc Unix process (PID is known). I guess I can use ps command to find that. can somebody help me in finding what exact command I should use to find? It is on AIX 5.3. Regards Asutosh (2 Replies)
Discussion started by: asutoshch
2 Replies

9. AIX

CPU usage of a process

I'm trying to monitor the CPU usage of a process and output that value to a file or variable. I know topas or nmon can tell me this in interactive mode but what I need is topas-looking output that allows me to write to a file after a discrete interval. Unlike nmon data collection to a file on top... (5 Replies)
Discussion started by: robot23
5 Replies

10. Solaris

Process CPU usage in Solaris 10

Hi All, Please let me know the command (expect top) to view the cpu usage of every process in Solaris 10. Thanks in Advance, Arun (1 Reply)
Discussion started by: arun.viswanath
1 Replies
Login or Register to Ask a Question

LEARN ABOUT DEBIAN

dh-exec-illiterate

DH-EXEC-ILLITERATE(1)						      dh-exec						     DH-EXEC-ILLITERATE(1)

NAME

       dh-exec-illiterate - Write literate debhelper config files!

SYNOPSIS

       #! /usr/bin/dh-exec --with=illiterate,subst,install
       Greetings, my dear reader, and welcome to the awesome world of
       literate programming!

       Today, we're going to explore how to write a debhelper install file in
       a literate manner. Trust me, it's going to be lots and lots of fun!

       So, what exactly are we trying to accomplish? We're going to try
       installing a file from `src/this-file' in the source tree, to a
       multi-arched path in the binary file. Lets say, to
       `/usr/lib/foo/${DEB_HOST_MULTIARCH}/'.

       Of course, ${DEB_HOST_MULTIARCH} is a variable, and will be expanded
       later in the dh-exec pipeline. It'll be something like
       x86_64-linux-gnu.

       Furthermore, we want to install all files from the 'usr/lib' directory
       under debian/tmp. If we were writing an illiteral install file, we'd
       write this rule as:

	   usr/lib

       But the above description is much easier to understand, isn't it?

       We're almost finished! One thing left to do, is to install a script
       named `rename-me', to `/usr/share/foo/new-name' - we renamed it
       in the process!

DESCRIPTION

       The dh-exec-illiterate sub-command, unlike the others, does not serve any particular case, except to serve as a warning to all, that things
       can be taken to an extreme, even with dh-exec. On the other hand, it is just like the other sub-commands in that it must not be called
       directly, but through dh-exec(1), which automatically runs all available sub-commands if run bare; or explicitly with dh-exec
       --with=illiterate.

       It is a program that will translate its input from pretty much free-form text into something that resembles an install file. At least,
       that's the only supported output format for now.

       Everything that's not recognised, will be ignored, and not printed. The recognised constructs are:

       `source' ... `destination'
	      The first string between a backtick and a single quote will be treated as the source file, the next such string will be the
	      destination. If the destination ends with a slash, dh-exec-illiterate will consider it a directory, otherwise it will output a
	      construct that dh-exec-install can recognise as a rename operation.

       'source'
	      A string, without whitespace, between two single quotes is treated as a source, whose destination is unspecified, and is left up to
	      dh_install(1) to figure out.

ENVIRONMENT

       DH_EXEC_SCRIPTDIR
	   Indicates which directory the command-specific scripts should be sought for. If not specified, scripts will be searched for in
	   /usr/share/dh-exec/.

FILES

       $DH_EXEC_SCRIPTDIR/dh-exec-illiterate-*
	   The various scripts for the higher-level program.

SEE ALSO

       debhelper(1), dh-exec(1)

AUTHOR

       dh-exec-illiterate is copyright (C) 2011-2012 by Gergely Nagy <algernon@madhouse-project.org>.

								    2012-05-03						     DH-EXEC-ILLITERATE(1)