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)
- 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