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PAPI_start_counters Class Reference

Start counting hardware events. More...

Detailed Description

@par C Interface:
\#include <papi.h> @n
int PAPI_start_counters( int *events, int array_len );
*eventsan array of codes for events such as PAPI_INT_INS or a native event code
array_lenthe number of items in the *events array
Return values
PAPI_EINVALOne or more of the arguments is invalid.
PAPI_EISRUNCounters have already been started, you must call PAPI_stop_counters() before you call this function again.
PAPI_ESYSA system or C library call failed inside PAPI, see the errno variable.
PAPI_ENOMEMInsufficient memory to complete the operation.
PAPI_ECNFLCTThe underlying counter hardware cannot count this event and other events in the EventSet simultaneously.
PAPI_ENOEVNTThe 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 )
See Also
PAPI_stop_counters() PAPI_add_event() PAPI_create_eventset()

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