Start counting hardware events. More...
@par C Interface: \#include <papi.h> @n int PAPI_start_counters( int *events, int array_len );
|*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|
|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().