MPI_T_pvar_write(3) MPI MPI_T_pvar_write(3) NAME MPI_T_pvar_write - Write a performance variable SYNOPSIS int MPI_T_pvar_write(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf) INPUT PARAMETERS session - identifier of performance experiment session (handle) handle - handle of a performance variable (handle) buf - initial address of storage location for variable value (choice) NOTES The MPI_T_pvar_write() call attempts to write the value of the performance variable with the handle identified by the parameter handle in the session identified by the parameter session. The value to be written is passed in the buffer identified by the parameter buf. The user must ensure that the buffer is of the appropriate size to hold the entire value of the perfor- mance variable (based on the datatype and count returned by the correspond- ing previous calls to MPI_T_pvar_get_info() and MPI_T_pvar_handle_alloc(), respectively). The constant MPI_T_PVAR_ALL_HANDLES cannot be used as an argument for the function MPI_T_pvar_write(). 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 - Invalid use of the interface or bad parameter values(s). 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_write(3)
NAME | SYNOPSIS | INPUT PARAMETERS | NOTES | THREAD AND INTERRUPT SAFETY | ERRORS
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