17.2.224. MPI_Info_get

MPI_Info_get - Retrieves the value associated with a key in an info object.

17.2.224.1. SYNTAX

17.2.224.1.1. C Syntax

#include <mpi.h>

int MPI_Info_get(MPI_Info info, const char *key, int valuelen, char *value, int *flag)

17.2.224.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_INFO_GET(INFO, KEY, VALUELEN, VALUE, FLAG, IERROR)
     INTEGER INFO, VALUELEN, IERROR
     CHARACTER*(*) KEY, VALUE
     LOGICAL FLAG

17.2.224.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_Info_get(info, key, valuelen, value, flag, ierror)
     TYPE(MPI_Info), INTENT(IN) :: info
     CHARACTER(LEN=*), INTENT(IN) :: key
     INTEGER, INTENT(IN) :: valuelen
     CHARACTER(LEN=valuelen), INTENT(OUT) :: value
     LOGICAL, INTENT(OUT) :: flag
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.224.2. INPUT PARAMETERS

  • info: Info object (handle).

  • key: Key (string).

  • valuelen: Length of value arg (integer).

17.2.224.3. OUTPUT PARAMETER

  • value: Value (string).

  • flag: Returns true if key defined, false if not (boolean).

  • IERROR: Fortran only: Error status (integer).

17.2.224.4. DESCRIPTION

MPI_Info_get retrieves the value associated with key in a previous call to MPI_Info_set. If such a key exists, it sets flag to true and returns the value in value; otherwise it sets flag to false and leaves value unchanged. valuelen is the number of characters available in value. If it is less than the actual size of the value, the returned value is truncated. In C, valuelen should be one less than the amount of allocated space to allow for the null terminator.

If key is larger than MPI_MAX_INFO_KEY, the call is erroneous.

17.2.224.5. ERRORS

Almost all MPI routines return an error value; C routines as the return result of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler associated with the communication object (e.g., communicator, window, file) is called. If no communication object is associated with the MPI call, then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler. When MPI_COMM_SELF is not initialized (i.e., before MPI_INIT / MPI_INIT_THREAD, after MPI_FINALIZE, or when using the Sessions Model exclusively) the error raises the initial error handler. The initial error handler can be changed by calling MPI_COMM_SET_ERRHANDLER on MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI argument to mpiexec or info key to MPI_COMM_SPAWN[_MULTIPLE]. If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all other MPI functions.

In the sessions model, the error handler can be set during MPI_Session_init.

Open MPI includes three predefined error handlers that can be used:

MPI_ERRORS_ARE_FATAL: Causes the program to abort all connected MPI processes.
MPI_ERRORS_ABORT:     An error handler that can be invoked on a communicator,
                      window, file, or session. When called on a communicator, it
                      acts as if MPI_ABORT was called on that communicator. If
                      called on a window or file, acts as if MPI_ABORT was called
                      on a communicator containing the group of processes in the
                      corresponding window or file. If called on a session,
                      aborts only the local process.
MPI_ERRORS_RETURN:    Returns an error code to the application.

MPI applications can also implement their own error handlers.

Custom MPI error handlers can be created by calling: MPI_Comm_create_errhandler(3) MPI_File_create_errhandler(3) MPI_Session_create_errhandler(3) MPI_Win_create_errhandler(3)

Predefined and custom error handlers can be set by calling: MPI_Comm_set_errhandler(3) MPI_File_set_errhandler(3) MPI_Session_set_errhandler(3) MPI_Win_set_errhandler(3)

Note that MPI does not guarantee that an MPI program can continue past an error.

See the MPI man page for a full list of MPI error codes.

See the Error Handling section of the MPI-3 standard for more information.