PAPI_start_counters(3)

NAME
PAPI_start_counters -

Start counting hardware events.

SYNOPSIS

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()

Author

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