MPI_Lookup_name(3)                 Open MPI                 MPI_Lookup_name(3)



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: Only search the global scope for name resolution.

       local,global: Search the local scope for name resolution.  If
           not found, try searching the global scope for name resolution.
           This behavior is the default if the ompi_lookup_order info key is
           not specified.

       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.
       Otherwise, 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++
       functions 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





1.4.1                            Jan 14, 2010               MPI_Lookup_name(3)
