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CPU Usage of a process

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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.
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LEARN ABOUT SUNOS

system

system(3C)																system(3C)

NAME

       system - issue a shell command

SYNOPSIS

       #include <stdlib.h>

       int system(const char *string);

       The  system() function causes string to be given to the shell as input, as if string had been typed as a command at a terminal. The invoker
       waits until the shell has completed, then returns the exit status of the shell in the format specified by waitpid(3C).

       If string is a null pointer, system() checks if the shell exists and is executable.  If the shell is available, system() returns a non-zero
       value; otherwise, it returns 0.	The standard to which the caller conforms determines which shell is used. See standards(5).

       The system() function executes vfork(2) to create a child process that in turn invokes one of the exec family of functions (see exec(2)) on
       the shell to execute string. If vfork() or the exec function fails, system() returns -1 and sets errno to indicate the error.

       The system() function fails if:

       EAGAIN	       The system-imposed limit on the total number of processes under execution by a single user would be exceeded.

       EINTR	       The system() function was interrupted by a signal.

       ENOMEM	       The new process requires more memory than is available.

USAGE

       The system() function manipulates the signal handlers for SIGINT, SIGQUIT, and SIGCHLD. It is therefore not safe to call system() in a mul-
       tithreaded process, since some other thread that manipulates these signal handlers and a thread that concurrently calls system() can inter-
       fere with each other in a destructive manner.  If, however, no such other thread is active, system() can safely be called concurrently from
       multiple threads. See popen(3C) for an alternative to system() that is thread-safe.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

       ksh(1), sh(1), exec(2), vfork(2), popen(3C), waitpid(3C), attributes(5), standards(5)

								    18 Dec 2003 							system(3C)