papi_read(3) [centos man page]

PAPI_read(3)							       PAPI							      PAPI_read(3)

NAME

       PAPI_read -

       Read hardware counters from an event set.

SYNOPSIS

Detailed Description
       C Interface:
	   #include <papi.h>
	    int PAPI_read(int  EventSet, long_long * values );

       PAPI_read() copies the counters of the indicated event set into the provided array.

       The counters continue counting after the read.

       Note the differences between PAPI_read() and PAPI_accum(), specifically that PAPI_accum() resets the values array to zero.

       PAPI_read() assumes an initialized PAPI library and a properly added event set.

       Parameters:
	   EventSet -- an integer handle for a PAPI Event Set as created by PAPI_create_eventset()
	   *values -- an array to hold the counter values of the counting events

       Return values:
	   PAPI_EINVAL One or more of the arguments is invalid.
	   PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.
	   PAPI_ENOEVST The event set specified does not exist.

       Examples

	   * do_100events();
	   * if (PAPI_read(EventSet, values) != PAPI_OK)
	   *	handle_error(1);
	   * // values[0] now equals 100
	   * do_100events();
	   * if (PAPI_accum(EventSet, values) != PAPI_OK)
	   *	handle_error(1);
	   * // values[0] now equals 200
	   * values[0] = -100;
	   * do_100events();
	   * if (PAPI_accum(EventSet, values) != PAPI_OK)
	   *	 handle_error(1);
	   * // values[0] now equals 0
	   *

       See Also:
	   PAPI_accum

	   PAPI_start

	   PAPI_stop

	   PAPI_reset

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014						      PAPI_read(3)

PAPI_accum(3)							       PAPI							     PAPI_accum(3)

NAME

       PAPI_accum -

       Accumulate and reset counters in an EventSet.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_accum( int  EventSet, long_long * values );

       These calls assume an initialized PAPI library and a properly added event set.
       PAPI_accum adds the counters of the indicated event set into the array values.
       The counters are zeroed and continue counting after the operation.
       Note the differences between PAPI_read and PAPI_accum, specifically
       that PAPI_accum resets the values array to zero.

       @param EventSet
	   an integer handle for a PAPI Event Set
	   as created by PAPI_create_eventset
       @param *values
	   an array to hold the counter values of the counting events

       @retval PAPI_EINVAL
	   One or more of the arguments is invalid.
       @retval PAPI_ESYS
	   A system or C library call failed inside PAPI, see the errno variable.
       @retval PAPI_ENOEVST
	   The event set specified does not exist.

       @par Examples:

       *   do_100events( );
       *   if ( PAPI_read( EventSet, values) != PAPI_OK )
       *   handle_error( 1 );
       *   // values[0] now equals 100
       *   do_100events( );
       *   if (PAPI_accum( EventSet, values ) != PAPI_OK )
       *   handle_error( 1 );
       *   // values[0] now equals 200
       *   values[0] = -100;
       *   do_100events( );
       *   if (PAPI_accum( EventSet, values ) != PAPI_OK )
       *   handle_error( 1 );
       *   // values[0] now equals 0
       *

       See Also:
	   PAPIF_accum

	   PAPI_start

	   PAPI_set_opt

	   PAPI_reset

Author
       Generated automatically by Doxygen for PAPI from the source code.

Version 5.2.0.0 						  Tue Jun 17 2014						     PAPI_accum(3)