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timer.cc

/*====================================================================
 * timer.c :
 *=========
 * 
 * defines functions : diffrusagetime,sumrusagetime,writerusagesystemtime,
 *                     writerusageusertime
 *
 * author : Marc Alexander Schweitzer <schweitz@iam.uni-bonn.de>
 *====================================================================*/
#ifdef __RUSAGE_TIME__

#include <stdio.h>
#include <sys/resource.h>
#include "timer.h"
//#include "error.h"

struct rusage diffrusagetime(struct rusage stop,struct rusage start)
  /* compute difference of times within the rusage structures stop, start
   *======================================================================
   * stop,start : the rusage structures
   *
   * return (struct rusage) : struct includes only usefull information in 
   *                          the corresponding time elements
   *======================================================================*/
{
  struct rusage diff;
  /* initalize diff */
  getrusage (RUSAGE_SELF,&diff);
  /* compute time difference */
  diff.ru_utime.tv_sec = stop.ru_utime.tv_sec-start.ru_utime.tv_sec;
  diff.ru_utime.tv_usec = stop.ru_utime.tv_usec-start.ru_utime.tv_usec;
  if (diff.ru_utime.tv_usec<0)
    {
      --diff.ru_utime.tv_sec;
      diff.ru_utime.tv_usec = 1000000+diff.ru_utime.tv_usec;
    }
  diff.ru_stime.tv_sec = stop.ru_stime.tv_sec-start.ru_stime.tv_sec;
  diff.ru_stime.tv_usec = stop.ru_stime.tv_usec-start.ru_stime.tv_usec;
  if (diff.ru_stime.tv_usec<0)
    {
      --diff.ru_stime.tv_sec;
      diff.ru_stime.tv_usec = 1000000+diff.ru_stime.tv_usec;
    }
  return diff;
}

struct rusage sumrusagetime(struct rusage stop,struct rusage start)
  /* compute sum of times within the rusage structures stop, start
   *======================================================================
   * stop,start : the rusage structures
   *
   * return (struct rusage) : struct includes only usefull information in 
   *                          the corresponding time elements
   *======================================================================*/
{
  struct rusage sum;
  sum.ru_utime.tv_sec = stop.ru_utime.tv_sec+start.ru_utime.tv_sec;
  sum.ru_utime.tv_usec = stop.ru_utime.tv_usec+start.ru_utime.tv_usec;
  if (sum.ru_utime.tv_usec>1000000)
    {
      ++sum.ru_utime.tv_sec;
      sum.ru_utime.tv_usec = sum.ru_utime.tv_usec-1000000;
    }
  sum.ru_stime.tv_sec = stop.ru_stime.tv_sec+start.ru_stime.tv_sec;
  sum.ru_stime.tv_usec = stop.ru_stime.tv_usec+start.ru_stime.tv_usec;
  if (sum.ru_stime.tv_usec>1000000)
    {
      ++sum.ru_stime.tv_sec;
      sum.ru_stime.tv_usec = sum.ru_stime.tv_usec-1000000;
    }
  return sum;
}

void writerusagesystemtime(FILE *file,struct rusage time)
  /* write the system time of 'time' to 'file'
   *==================================================================
   * file : the file handle
   * time : the struct, which system time data element is to be written
   *==================================================================*/
{
  double system = (double)time.ru_stime.tv_sec+1e-6*(double)time.ru_stime.tv_usec;
  fprintf(file,"%.6f sec",system);
}

void writerusageusertime(FILE *file,struct rusage time)
  /* write the user time of 'time' to 'file'
   *==================================================================
   * file : the file handle
   * time : the struct, which user time data element is to be written
   *==================================================================*/
{
  double user = (double)time.ru_utime.tv_sec+1e-6*(double)time.ru_utime.tv_usec;
  fprintf(file,"%.6f sec",user);
}

void writerusagetime(FILE *file,struct rusage time)
  /* write the user time of 'time' to 'file'
   *==================================================================
   * file : the file handle
   * time : the struct, which system and user time data elements are to be written
   *==================================================================*/
{
  double user = (double)time.ru_utime.tv_sec+1e-6*(double)time.ru_utime.tv_usec;
  double system = (double)time.ru_stime.tv_sec+1e-6*(double)time.ru_stime.tv_usec;
  fprintf(file,"system : ");
  fprintf(file,"%.6f sec",system);
  fprintf(file,"\tuser : ");
  fprintf(file,"%.6f sec",user);
  fprintf(file,"\tsum : ");
  fprintf(file,"%.6f sec",user+system);
}


void writerusagetime2(char *strg , struct rusage time)
  /* write the user time of 'time' to 'file'
   *==================================================================
   * file : the file handle
   * time : the struct, which system and user time data elements are to be written
   *==================================================================*/
{
  double user = (double)time.ru_utime.tv_sec+1e-6*(double)time.ru_utime.tv_usec;
  double system = (double)time.ru_stime.tv_sec+1e-6*(double)time.ru_stime.tv_usec;
  printf("%s system : ",strg);
  printf("%.6f sec",system);
  printf("\tuser : ");
  printf("%.6f sec",user);
  printf("\tsum : ");
  printf("%.6f sec",user+system);
}



#else
#include <time.h>
#include <stdio.h>
#include "timer.h"

#endif

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