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Full Discussion: Calculate %Cpu
Top Forums UNIX for Dummies Questions & Answers Calculate %Cpu Post 302604155 by methyl on Saturday 3rd of March 2012 11:25:54 AM
Old 03-03-2012
Please post homework in the homework forum.

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).
 

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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)
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