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NAME

       MPI_T_pvar_start -  Start a performance variable

SYNOPSIS

       int MPI_T_pvar_start(MPI_T_pvar_session session, MPI_T_pvar_handle handle)

INPUT PARAMETERS

       session
              - identifier of performance experiment session (handle)
       handle - handle of a performance variable (handle)

NOTES

       If  the  constant  MPI_T_PVAR_ALL_HANDLES  is passed in handle, the MPI
       implementation attempts to  start  all  variables  within  the  session
       identified  by  the  parameter  session  for  which  handles  have been
       allocated. In  this  case,  the  routine  returns  MPI_SUCCESS  if  all
       variables        are        started       successfully,       otherwise
       MPI_T_ERR_PVAR_NO_STARTSTOP  is  returned.   Continuous  variables  and
       variables    that    are    already    started    are    ignored   when
       MPI_T_PVAR_ALL_HANDLES is specified.

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This  means  that  this  routine  may  be
       safely  used by multiple threads without the need for any user-provided
       thread locks.  However, the routine is not interrupt safe.   Typically,
       this  is due to the use of memory allocation routines such as malloc or
       other non-MPICH runtime routines that  are  themselves  not  interrupt-
       safe.

ERRORS

       All  MPI  routines  (except  MPI_Wtime  and MPI_Wtick ) return an error
       value; C routines as the value of the function and Fortran routines  in
       the last argument.  Before the value is returned, the current MPI error
       handler is called.  By default, this error handler aborts the MPI  job.
       The  error  handler  may  be  changed with MPI_Comm_set_errhandler (for
       communicators),    MPI_File_set_errhandler     (for     files),     and
       MPI_Win_set_errhandler   (for   RMA   windows).    The   MPI-1  routine
       MPI_Errhandler_set  may  be  used  but  its  use  is  deprecated.   The
       predefined  error  handler MPI_ERRORS_RETURN may be used to cause error
       values to be returned.  Note that MPI does not guarentee  that  an  MPI
       program  can  continue past an error; however, MPI implementations will
       attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_T_ERR_NOT_INITIALIZED
              - The MPI tool information interface is not initialized.
       MPI_T_ERR_INVALID_SESSION
              - Session argument is not valid.
       MPI_T_ERR_INVALID_HANDLE
              - The handle is invalid.
       MPI_T_ERR_PVAR_NO_STARTSTOP
              - The performance variable can not be started or stopped.

LOCATION

       /tmp/gyCYfBi4J6/mpich-3.1/src/mpi_t/pvar_start.c

                                   2/20/2014               MPI_T_pvar_start(3)



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