PAPI_hl_region_begin(3)

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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