PAPI_hl_region_begin3
Read performance events at the beginning of a region.
Detailed Description
C Interface:
#include <papi.h>
int PAPI_hl_region_begin( const char* region );
Parameters
region -- a unique region name
Return values
PAPI_OK
PAPI_ENOTRUN -- EventSet is currently not running or could not determined.
PAPI_ESYS -- A system or C library call failed inside PAPI, see the errno variable.
PAPI_EMISC -- PAPI has been deactivated due to previous errors.
PAPI_ENOMEM -- Insufficient memory.
PAPI_hl_region_begin reads performance events and stores them internally at the beginning of an instrumented code region. If not specified via the environment variable PAPI_EVENTS, default events are used. The first call sets all counters implicitly to zero and starts counting. Note that if PAPI_EVENTS is not set or cannot be interpreted, default performance events are recorded.
Example:
export PAPI_EVENTS="PAPI_TOT_INS,PAPI_TOT_CYC"
int retval;
retval = PAPI_hl_region_begin("computation");
if ( retval != PAPI_OK )
handle_error(1);
//Do some computation here
retval = PAPI_hl_region_end("computation");
if ( retval != PAPI_OK )
handle_error(1);
See also
PAPI_hl_read
PAPI_hl_region_end
PAPI_hl_stop
Releases
3 releases since Debian 11 (Bullseye); the text changed 2 times.