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NAME
MPI_Lookup_name - Finds port associated with a service name
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Lookup_name(char *service_name, MPI_Info info,
char *port_name)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_LOOKUP_NAME(SERVICE_NAME, INFO, PORT_NAME, IERROR)
CHARACTER*(*) SERVICE_NAME, PORT_NAME
INTEGER INFO, IERROR
C++ Syntax
#include <mpi.h>
void MPI::Lookup_name(const char *service_name, const MPI::Info& info,
char* port_name)
INPUT PARAMETERS
service_name A service name (string).
info Options to the name service functions (handle).
OUTPUT PARAMETERS
port_name a port name (string).
IERROR Fortran only: Error status (integer).
DESCRIPTION
This function retrieves a port_name published under service_name by a
previous invocation of MPI_Publish_name. The application must supply a
port_name buffer large enough to hold the largest possible port name
(i.e., MPI_MAX_PORT_NAME bytes).
INFO ARGUMENTS
The following keys for info are recognized:
Key Type Description
--- ---- -----------
ompi_lookup_order char * Resolution order for name lookup.
The ompi_lookup_order info key can specify one of four valid string
values (see the NAME SCOPE section below for more information on name
scopes):
local: Only search the local scope for name resolution.
global,local: Search the global scope for name resolution. If
not found, try searching the local scope for name resolution.
If no info key is provided, the search will first check to see if a
global server has been specified and is available. If so, then the
search will default to global scope first, followed by local. Other-
wise, the search will default to local.
NAME SCOPE
Open MPI supports two name scopes: global and local. Local scope values
are placed in a data store located on the mpirun of the calling
process' job, while global scope values reside on a central server.
Calls to MPI_Unpublish_name must correctly specify the scope to be used
in finding the value to be removed. The function will return an error
if the specified service name is not found on the indicated location.
For a more detailed description of scoping rules, please see the
MPI_Publish_name man page.
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to
MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
MPI_Comm_set_errhandler; 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.
See the MPI man page for a full list of MPI error codes.
SEE ALSO
MPI_Publish_name
MPI_Open_port
1.3.4 Nov 11, 2009 MPI_Lookup_name(3)
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