getrusage() Post: 302122770

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Operating Systems HP-UX getrusage() Post 302122770 by jim mcnamara on Thursday 21st of June 2007 09:53:39 AM

06-21-2007

Registered User

Code:

#include <stdlib.h>
#include <sys/resource.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>     


void process(struct rusage *p, char *when)
{
	printf("%s\n", when);
	printf(" /* user time used */                   %8d  %8d\n",  p->ru_utime.tv_sec,p->ru_utime.tv_usec   );
	printf(" /* system time used */                 %8d  %8d\n",  p->ru_stime.tv_sec,p->ru_stime.tv_usec   );
	printf(" /* integral shared memory size */      %8d\n",  p->ru_ixrss           );
	printf(" /* integral unshared data  */          %8d\n",  p->ru_idrss           );
	printf(" /* integral unshared stack  */         %8d\n",  p->ru_isrss           );
	printf(" /* page reclaims */                    %8d\n",  p->ru_minflt          );
	printf(" /* page faults */                      %8d\n",  p->ru_majflt          );
	printf(" /* swaps */                            %8d\n",  p->ru_nswap           );
	printf(" /* block input operations */           %8d\n",  p->ru_inblock         );
	printf(" /* block output operations */          %8d\n",  p->ru_oublock         );
	printf(" /* # of characters read/written */     %8d\n",  p->ru_ioch            );
	printf(" /* messages sent */                    %8d\n",  p->ru_msgsnd          );
	printf(" /* messages received */                %8d\n",  p->ru_msgrcv          );
	printf(" /* signals received */                 %8d\n",  p->ru_nsignals        );
	printf(" /* voluntary context switches */       %8d\n",  p->ru_nvcsw           );
	printf(" /* involuntary  */                     %8d\n",  p->ru_nivcsw          );

}


int main()
{
	  int ret;
	  char *buf;
	  int i=0;
	  int who= RUSAGE_SELF;
	  struct rusage usage;
	  struct rusage *p=&usage;

	  ret=getrusage(who,p);
	  process(p, "-------------before");
	  /* do stuff here */
      ret=getrusage(who,p);
	  process(p, "\n\n-------------after we run foo1");    

	return 0;
}

Note getrusage() works only for a process and its children.

jim mcnamara

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getrusage

GETRUSAGE(2)						      BSD System Calls Manual						      GETRUSAGE(2)

NAME

     getrusage -- get information about resource utilization

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/resource.h>
     #define   RUSAGE_SELF     0
     #define   RUSAGE_CHILDREN	   -1

     int
     getrusage(int who, struct rusage *rusage);

DESCRIPTION

     getrusage() returns information describing the resources used by the current process, or all its terminated child processes.  The who parame-
     ter is either RUSAGE_SELF or RUSAGE_CHILDREN.  The buffer to which rusage points will be filled in with the following structure:

     struct rusage {
	     struct timeval ru_utime; /* user time used */
	     struct timeval ru_stime; /* system time used */
	     long ru_maxrss;	      /* max resident set size */
	     long ru_ixrss;	      /* integral shared text memory size */
	     long ru_idrss;	      /* integral unshared data size */
	     long ru_isrss;	      /* integral unshared stack size */
	     long ru_minflt;	      /* page reclaims */
	     long ru_majflt;	      /* page faults */
	     long ru_nswap;	      /* swaps */
	     long ru_inblock;	      /* block input operations */
	     long ru_oublock;	      /* block output operations */
	     long ru_msgsnd;	      /* messages sent */
	     long ru_msgrcv;	      /* messages received */
	     long ru_nsignals;	      /* signals received */
	     long ru_nvcsw;	      /* voluntary context switches */
	     long ru_nivcsw;	      /* involuntary context switches */
     };

     The fields are interpreted as follows:

     ru_utime	  the total amount of time spent executing in user mode.

     ru_stime	  the total amount of time spent in the system executing on behalf of the process(es).

     ru_maxrss	  the maximum resident set size used (in kilobytes).

     ru_ixrss	  an integral value indicating the amount of memory used by the text segment that was also shared among other processes.  This
		  value is expressed in units of kilobytes * ticks-of-execution.

     ru_idrss	  an integral value of the amount of unshared memory residing in the data segment of a process (expressed in units of kilobytes *
		  ticks-of-execution).

     ru_isrss	  an integral value of the amount of unshared memory residing in the stack segment of a process (expressed in units of kilobytes *
		  ticks-of-execution).

     ru_minflt	  the number of page faults serviced without any I/O activity; here I/O activity is avoided by reclaiming a page frame from the
		  list of pages awaiting reallocation.

     ru_majflt	  the number of page faults serviced that required I/O activity.

     ru_nswap	  the number of times a process was swapped out of main memory.

     ru_inblock   the number of times the file system had to perform input.

     ru_oublock   the number of times the file system had to perform output.

     ru_msgsnd	  the number of IPC messages sent.

     ru_msgrcv	  the number of IPC messages received.

     ru_nsignals  the number of signals delivered.

     ru_nvcsw	  the number of times a context switch resulted due to a process voluntarily giving up the processor before its time slice was
		  completed (usually to await availability of a resource).

     ru_nivcsw	  the number of times a context switch resulted due to a higher priority process becoming runnable or because the current process
		  exceeded its time slice.

NOTES

     The numbers ru_inblock and ru_oublock account only for real I/O; data supplied by the caching mechanism is charged only to the first process
     to read or write the data.

ERRORS

     getrusage() returns -1 on error.  The possible errors are:

     [EINVAL]		The who parameter is not a valid value.

     [EFAULT]		The address specified by the rusage parameter is not in a valid part of the process address space.

SEE ALSO

     gettimeofday(2), wait(2)

HISTORY

     The getrusage() function call appeared in 4.2BSD.

BUGS

     There is no way to obtain information about a child process that has not yet terminated.

BSD
								   June 4, 1993 							       BSD

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getrusage