timer.c File Reference

Detailed Description

Provides functions for collecting run-time statistics such as CPU time, memory usage, I/O counts, and elapsed time.

This file contains implementations of functions like init_stats(), cpu_time(), memory_count(), and others, which collect various run-time statistics. The implementations vary depending on the operating system (VAX/VMS, SUN UNIX, Linux, Solaris, etc.). The functions utilize system-specific libraries and system calls to retrieve the necessary information.

Copyright

• (c) 2002 The University of Chicago, as Operator of Argonne National Laboratory.
• (c) 2002 The Regents of the University of California, as Operator of Los Alamos National Laboratory.

License

This file is distributed under the terms of the Software License Agreement found in the file LICENSE included with this distribution.

Author

M. Borland, C Saunders, R. Soliday, Y. Wang

Definition in file timer.c.

#include "mdb.h"
#include <sys/time.h>

Go to the source code of this file.

Functions
double	delapsed_time ()
	Calculates the elapsed clock time since the last initialization as a numerical value.
char *	elapsed_time ()
void	init_stats ()
long	cpu_time ()
	Retrieves the CPU time used since the last initialization.
long	bio_count ()
long	dio_count ()
long	page_faults ()
	Retrieves the number of page faults since the last initialization.
long	memory_count ()

Function Documentation

bio_count()

long bio_count

(

)

Definition at line 125 of file timer.c.

                 {
  return 0;
}

cpu_time()

long cpu_time

(

)

Retrieves the CPU time used since the last initialization.

This function retrieves the CPU time consumed by the process since init_stats() was last called.

Returns

The CPU time used in hundredths of seconds, or -1 on error.

Definition at line 117 of file timer.c.

                {
  return (long)((clock() * 100.0) / CLOCKS_PER_SEC);
}

delapsed_time()

double delapsed_time

(

void

)

Calculates the elapsed clock time since the last initialization as a numerical value.

This function calculates the elapsed time in seconds since init_stats() was last called.

Returns

The elapsed time in seconds, or 0.0 if not available.

Definition at line 92 of file timer.c.

                       {
# if defined(linux)
  struct timespec delapsedNow;
  if (!delapsedStartInitialized)
    init_stats();
  clock_gettime(CLOCK_REALTIME, &delapsedNow);
  return (double)(delapsedNow.tv_sec - delapsedStart.tv_sec) +
    (delapsedNow.tv_nsec - delapsedStart.tv_nsec)/1e9;
# else
  static long delapsed_start = -1;
  if (delapsed_start == -1) {
    delapsed_start = time(0);
    return 0.0;
  } else
    return time(0) - delapsed_start;
# endif
}

dio_count()

long dio_count

(

)

Definition at line 133 of file timer.c.

                 {
  return (0);
}

elapsed_time()

char * elapsed_time

(

)

Definition at line 30 of file timer.c.

                     {
  static char buffer[20];
  static double dtime;
  int h, m;
  float s;
 
  dtime = delapsed_time();
  h = dtime / 3600;
  dtime -= h * 3600;
  m = dtime / 60;
  dtime -= m * 60;
  s = dtime;
 
  sprintf(buffer, "%02d:%02d:%02.3f", h, m, s);
  return (buffer);
}

init_stats()

void init_stats

(

)

Definition at line 79 of file timer.c.

                  {
  delapsed_start = delapsed_time();
  clock();
}

memory_count()

long memory_count

(

)

Definition at line 184 of file timer.c.

                    {
  return 0;
}

page_faults()

long page_faults

(

)

Retrieves the number of page faults since the last initialization.

This function retrieves the number of page faults that have occurred since init_stats() was last called.

Returns

The number of page faults, or -1 on error.

Definition at line 144 of file timer.c.

                   {
  return 0;
}