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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