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MPI_Comm_set_name - Set a name on a communicator
#include <mpi.h>
int MPI_Comm_set_name(MPI_Comm comm, char *name)
comm
- Communicator
name
- Pointer to the name of communicator
This function associates a name with a communicator, which can be useful for debugging purposes.
The function MPI_Comm_get_name
can be used to retrieve name that was previously set with MPI_Comm_set_name.
The MPI_COMM_WORLD and
MPI_COMM_SELF,
have the predefined names "MPI_COMM_WORLD" and
"MPI_COMM_SELF", respectively.
It is legal to change any of these names with calls to MPI_Comm_set_name.
Names passed in C must include the null terminator, and can be of maximum length
MPI_MAX_OBJECT_NAME
(including the null terminator). Names passed in Fortran can also have a maximum length of
MPI_MAX_OBJECT_NAME.
Setting a name on a communicator that already has a name associated with it replaces the old name.
If an error occurs in an MPI function, the current MPI error handler is called to handle it. By default, this error handler
aborts the MPI job. The error handler may be changed with MPI_Errhandler_set; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned (in C and Fortran; this error handler is less useful in with the C++ MPI
bindings. The predefined error handler MPI::ERRORS_THROW_EXCEPTIONS should be used in C++ if the error value needs to be
recovered). Note that MPI does not guarantee that an MPI program can continue past an error.
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. The C++ bindings
for MPI do not return error values; instead, error values are communicated by throwing exceptions of type MPI::Exception
(but not by default). Exceptions are only thrown if the error value is not MPI::SUCCESS.
Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI functions will return upon an error, there will be
no way to recover what the actual error value was.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_COMM
- Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank).
MPI_ERR_ARG
- Invalid argument. Some argument is invalid and is not identified by a specific error class. This is typically a NULL
pointer or other such error.
MPI_Comm_get_name, MPI_Type_get_name, MPI_Type_set_name, MPI_Win_get_name, MPI_Win_set_name
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