papi_num_counters(3) [centos man page]

PAPI_num_counters(3)						       PAPI						      PAPI_num_counters(3)

NAME

       PAPI_num_counters -

       Get the number of hardware counters available on the system.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_num_counters( void );

       Postcondition:
	   Initializes the library to PAPI_HIGH_LEVEL_INITED if necessary.

       Return values:
	   PAPI_EINVAL papi.h is different from the version used to compile the PAPI library.
	   PAPI_ENOMEM Insufficient memory to complete the operation.
	   PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.

       Examples:

	   * int num_hwcntrs;
	   * //  The installation does not support PAPI
	   * if ((num_hwcntrs = PAPI_num_counters()) < 0 )
	   *   handle_error(1);
	   * //  The installation supports PAPI, but has no counters
	   * if ((num_hwcntrs = PAPI_num_counters()) == 0 )
	   *   fprintf(stderr,"Info:: This machine does not provide hardware counters.0);
	   *

       PAPI_num_counters() returns the optimal length of the values array for the high level functions. This value corresponds to the number of
       hardware counters supported by the current CPU component.

       Note:
	   This function only works for the CPU component. To determine the number of counters on another component, use the low level
	   PAPI_num_cmp_hwctrs().

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

Version 5.2.0.0 						  Tue Jun 17 2014					      PAPI_num_counters(3)

PAPI_start_counters(3)						       PAPI						    PAPI_start_counters(3)

NAME

       PAPI_start_counters -

       Start counting hardware events.

SYNOPSIS

Detailed Description
       @par C Interface:
       int PAPI_start_counters( int *events, int array_len );

       Parameters:
	   *events an array of codes for events such as PAPI_INT_INS or a native event code
	   array_len the number of items in the *events array

       Return values:
	   PAPI_EINVAL One or more of the arguments is invalid.
	   PAPI_EISRUN Counters have already been started, you must call PAPI_stop_counters() before you call this function again.
	   PAPI_ESYS A system or C library call failed inside PAPI, see the errno variable.
	   PAPI_ENOMEM Insufficient memory to complete the operation.
	   PAPI_ECNFLCT The underlying counter hardware cannot count this event and other events in the EventSet simultaneously.
	   PAPI_ENOEVNT The PAPI preset is not available on the underlying hardware.

       PAPI_start_counters() starts counting the events named in the *events array. This function cannot be called if the counters have already
       been started. The user must call PAPI_stop_counters() to stop the events explicitly if he/she wants to call this function again. It is the
       user's responsibility to choose events that can be counted simultaneously by reading the vendor's documentation. The length of the *events
       array should be no longer than the value returned by PAPI_num_counters().

       if( PAPI_start_counters( Events, num_hwcntrs ) != PAPI_OK )
	   handle_error(1);
	*

       See Also:
	   PAPI_stop_counters() PAPI_add_event() PAPI_create_eventset()

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

Version 5.2.0.0 						  Tue Jun 17 2014					    PAPI_start_counters(3)