NAME

PAPI_get_virt_cyc, PAPI_get_virt_usec - get virtual time counter values

CONTENTS

Synopsis
Description
Errors
Example
Author
Bugs
See Also

C Interface

#include <papi.h> 

long_long PAPI_get_virt_cyc(void); 

long_long PAPI_get_virt_usec(void); 

Fortran Interface

#include fpapi.h 

PAPIF_get_virt_usec(C_LONG_LONG time) 

PAPIF_get_virt_cyc(C_LONG_LONG virt_cyc) 

PAPI_get_virt_cyc (3) 

Both of these functions return the total number of virtual units from some arbitrary starting point. Virtual units accrue every time the process is running in user-mode on behalf of the process. Like the real time counters, these are guaranteed to exist on every platform PAPI supports. However on some platforms, the resolution can be as bad as 1/Hz as defined by the operating system.

These functions always succeed.

long_long s, e;
        
if (PAPI_library_init(PAPI_VER_CURRENT) != PAPI_VER_CURRENT)
  exit(1);

s = PAPI_get_virt_cyc();

your_slow_code();

e = PAPI_get_virt_cyc();
printf("Process has run for cycles: %lld\n",e-s);

Philip J. Mucci <mucci@cs.utk.edu>

This function has no known bugs.

PAPI_library_init (3), PAPI_get_real_usec (3), PAPI_get_real_cyc (3),
The PAPI Web Site: http://icl.cs.utk.edu/projects/papi