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Full Discussion: How to find out memory & cpu usage of a process
Top Forums UNIX for Advanced & Expert Users How to find out memory & cpu usage of a process Post 302365205 by jim mcnamara on Monday 26th of October 2009 09:51:08 AM
Old 10-26-2009
You will have to write C code this primitive example using getrusage(). Note -- not all systems fully support all of getrusage():
Code:
/* rusage.c
    usage:
    rusage  [executable_file_or_script]
*/
#include <sys/types.h>
#include <stdlib.h>
#include <sys/resrouces.h>
#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <errno.h>

char cmd[ARG_MAX]={0x0};

int dump(void)
{
		struct rusage s;
		struct rusage *p=&s;
		
  	getrusage(RUSAGE_CHILDREN, p);
		fprintf(stdout, "maximum resident set size              =%ld\n", p->ru_maxrss);
		fprintf(stdout, "integral resident set size             =%ld\n", p->ru_idrss);
		fprintf(stdout, "page faults not requiring physical I/O =%ld\n", p->ru_minflt);
		fprintf(stdout, "page faults requiring physical I/O     =%ld\n", p->ru_majflt);
		fprintf(stdout, "swaps                                  =%ld\n", p->ru_nswap);
		fprintf(stdout, "block input operations                 =%ld\n", p->ru_inblock);
		fprintf(stdout, "block output operations                =%ld\n", p->ru_oublock);
		fprintf(stdout, "messages sent                          =%ld\n", p->ru_msgsnd);
		fprintf(stdout, "messages received                      =%ld\n", p->ru_msgrcv);
		fprintf(stdout, "signals received                       =%ld\n", p->ru_nsignals);
		fprintf(stdout, "voluntary context switches             =%ld\n", p->ru_nvcsw);
		fprintf(stdout, "involuntary context switches           =%ld\n", p->ru_nivcsw);
  	return 1;
}

int main(int argc, char *argv[])
{
    char *p=cmd;
    int i=1;
    ptrdiff_t d=ARG_MAX;

    for(i=1; i < argc; i++)
    {
        size_t len=strlen(argv[i]);
        if( d - len > ARG_MAX)
        {
           sprintf(p, "%s ", argv[i]);
           d-=len;
           p+=(len +1);
        }
        else
        {
        	errno=E2BIG;
        	perror("Invalid parameter list");
        	exit(1);
        }
    }
    if(*cmd)
    {
	  	system(cmd);
	  	dump();
	  }
	  else
	  {
	  	errno=EINVAL;
	  	perror("cannot execute command");
	  	exit(1);
	  }
    return 0;
}

 

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LEARN ABOUT SUNOS

rusage

rusage(1B)					     SunOS/BSD Compatibility Package Commands						rusage(1B)

NAME

       rusage - print resource usage for a command

SYNOPSIS

       /usr/ucb/rusage command

DESCRIPTION

       The  rusage command is similar to time(1). It runs the given command, which must be specified; that is, command is not optional as it is in
       the C shell's timing facility. When the command is complete, rusage displays the real (wall clock), the system CPU, and the user CPU  times
       which  elapsed during execution of the command, plus other fields in the rusage structure, all on one long line. Times are reported in sec-
       onds and hundredths of a second.

EXAMPLES

       Example 1: The format of rusage output

       The example below shows the format of rusage output.

       example% rusage wc /usr/share/man/man1/csh(1)
       3045   13423   78071 /usr/share/man/man1/csh(1)
       2.26 real 0.80 user 0.36 sys 11 pf 38 pr 0 sw 11 rb 0 wb 16 vcx 37
		icx 24 mx 0 ix 1230 id 9 is
       example%

       Each of the fields identified corresponds to an element of the rusage structure, as described in getrusage(3C), as follows:

       real			  elapsed real time
       user	 ru_utime	  user time used
       sys	 ru_stime	  system time used
       pf	 ru_majflt	  page faults requiring physical I/O
       pr	 ru_minflt	  page faults not requiring physical
				  I/O
       sw	 ru_nswap	  swaps
       rb	 ru_inblock	  block input operations
       wb	 ru_oublock	  block output operations
       vcx	 ru_nvcsw	  voluntary context switches
       icx	 ru_nivcsw	  involuntary context switches
       mx	 ru_maxrss	  maximum resident set size
       ix	 ru_ixrss	  currently 0
       id	 ru_idrss	  integral resident set size
       is	 ru_isrss	  currently 0

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), time(1), getrusage(3C), attributes(5)

BUGS

       When the command being timed is interrupted, the timing values displayed may be inaccurate.

SunOS 5.10							    14 Sep 1992 							rusage(1B)
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