MPI_T_pvar_reset(3) MPI MPI_T_pvar_reset(3) NAME MPI_T_pvar_reset - Reset a performance variable SYNOPSIS int MPI_T_pvar_reset(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 The MPI_T_pvar_reset() call sets the performance variable with the handle identified by the parameter handle to its starting value. If it is not pos- sible to change the variable, the function returns MPI_T_ERR_PVAR_NO_WRITE. If the constant MPI_T_PVAR_ALL_HANDLES is passed in handle, the MPI imple- mentation attempts to reset 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 reset successfully, otherwise MPI_T_ERR_PVAR_NO_WRITE is returned. Readonly variables are ig- nored 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 ar- gument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error han- dler 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 guarantee 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_INVALID_HANDLE - The handle is invalid. MPI_T_ERR_INVALID_SESSION - Session argument is not valid. MPI_T_ERR_NOT_INITIALIZED - The MPI tool information interface is not initialized. MPI_T_ERR_PVAR_NO_WRITE - The performance variable can not be written or reset. MPI_ERR_OTHER - Other error; use MPI_Error_string to get more information about this error code. 4/10/2026 MPI_T_pvar_reset(3)
NAME | SYNOPSIS | INPUT PARAMETERS | NOTES | THREAD AND INTERRUPT SAFETY | ERRORS
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