Start counting hardware events. More...

Detailed Description

C Interface:: #include <papi.h>
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()

The documentation for this class was generated from the following file:

papi_hl.c