MPI_Publish_name - Publish a service name for dynamic process control
MPI_Publish_name(char *service_name, MPI_Info info, char *port_name)
- a service name to associate with the port
info - implementation-specific information
- a port name from MPI_Open_port
Currently, LAM/MPI ignores any info keys that are passed to this
function. As such, info keys specific to a different implementation
can safely be passed to this function. Additionally, the MPI constant
MPI_INFO_NULL can also be used.
The scope of the published name is the LAM universe -- MPI processes
running on any node included from the initial lamboot are capable of
retrieving a name published by MPI_Publish_name . Service names stay
in existence until they are either manually removed with
MPI_Unpublish_name or cleaned with the lamclean command. It is a
common mistake to forget to MPI_Unpublish_name at the end of a run, and
therefore leave published names in the LAM runtime environment.
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
an additional argument ierr at the end of the argument list. ierr is
an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with
the call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
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.
- No error; MPI routine completed successfully.
- 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.
- This error class is associated with an error code that
indicates that there was a problem with the service name that
was used. Depending on the context, this can indicate that the
service name was already published or that the service name was
not yet published.
For more information, please see the official MPI Forum web site, which
contains the text of both the MPI-1 and MPI-2 standards. These
documents contain detailed information about each MPI function (most of
which is not duplicated in these man pages).