NAME

PAPI_hl_region_begin - Read performance events at the beginning of a region.

SYNOPSIS

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

Author

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