NAME

PAPIf_hl_region_begin - Reads and stores hardware events at the beginning of an instrumented code region.

SYNOPSIS

Detailed Description

Fortran Prototype:

#include 'fpapi.h'
PAPIf_hl_region_begin( C_STRING region, C_INT check )

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 erros.
PAPI_ENOMEM -- Insufficient memory.

PAPIf_hl_region_begin reads hardware events and stores them internally at the beginning of an instrumented code region. If not specified via 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 hardware events are recorded.

Example:

export PAPI_EVENTS="PAPI_TOT_INS,PAPI_TOT_CYC"

integer retval
call PAPIf_hl_region_begin("computation", retval)
if ( retval .NE. PAPI_OK ) then
     write (*,*) "PAPIf_hl_region_begin failed!"
end if
!do some computation here
call PAPIf_hl_region_end("computation", retval)
if ( retval .NE. PAPI_OK ) then
    write (*,*) "PAPIf_hl_region_end failed!"
end if

See also

PAPI_hl_region_begin

Author

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