129 строки
3.8 KiB
Plaintext
129 строки
3.8 KiB
Plaintext
.\" Copyright 2010 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2007-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Lookup_name 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
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.SH NAME
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.nf
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\fBMPI_Lookup_name\fP \- Finds port associated with a service name
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.fi
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.SH SYNTAX
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.ft R
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.SH C Syntax
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.nf
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#include <mpi.h>
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int MPI_Lookup_name(char *\fIservice_name\fP, MPI_Info \fIinfo\fP,
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char *\fIport_name\fP)
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.fi
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.SH Fortran Syntax
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.nf
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INCLUDE 'mpif.h'
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MPI_LOOKUP_NAME(\fISERVICE_NAME, INFO, PORT_NAME, IERROR\fP)
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CHARACTER*(*) \fISERVICE_NAME, PORT_NAME\fP
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INTEGER \fIINFO, IERROR\fP
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.fi
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.SH C++ Syntax
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.nf
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#include <mpi.h>
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void MPI::Lookup_name(const char *\fIservice_name\fP, const MPI::Info& \fIinfo\fP,
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char* \fIport_name\fP)
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.fi
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.SH INPUT PARAMETERS
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.ft R
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.TP 1.4i
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service_name
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A service name (string).
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.TP 1.4i
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info
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Options to the name service functions (handle).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1.4i
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port_name
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a port name (string).
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.TP 1.4i
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IERROR
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Fortran only: Error status (integer).
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.SH DESCRIPTION
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.ft R
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This function retrieves a \fIport_name\fP published under
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\fIservice_name\fP by a previous invocation of MPI_Publish_name. The
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application must supply a \fIport_name\fP buffer large enough to hold
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the largest possible port name (i.e., MPI_MAX_PORT_NAME bytes).
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.SH INFO ARGUMENTS
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The following keys for \fIinfo\fP are recognized:
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.sp
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.sp
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.nf
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Key Type Description
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--- ---- -----------
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ompi_lookup_order char * Resolution order for name lookup.
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.fi
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The \fIompi_lookup_order\fP info key can specify one of four valid
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string values (see the NAME SCOPE section below for more information
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on name scopes):
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.TP 4
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\fIlocal\fP: Only search the local scope for name resolution.
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.TP 4
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\fIglobal\fP: Only search the global scope for name resolution.
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.TP 4
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\fIlocal,global\fP: Search the local scope for name resolution. If
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not found, try searching the global scope for name resolution. This
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behavior is the default if the \fIompi_lookup_order\fP info key is not
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specified.
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.TP 4
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\fIglobal,local\fP: Search the global scope for name resolution. If
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not found, try searching the local scope for name resolution.
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.PP
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If no info key is provided, the search will first check to see if a
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global server has been specified and is available. If so, then the
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search will default to global scope first, followed by local. Otherwise,
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the search will default to local.
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.SH NAME SCOPE
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Open MPI supports two name scopes: \fIglobal\fP and \fIlocal\fP. Local scope
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values are placed in a data store located on the mpirun of the calling
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process' job, while global scope values reside on a central server. Calls
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to MPI_Unpublish_name must correctly specify the scope to be used in
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finding the value to be removed. The function will return an error if
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the specified service name is not found on the indicated location.
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.sp
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For a more detailed description of scoping rules, please see the MPI_Publish_name
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man page.
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.SH ERRORS
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.ft R
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Almost all MPI routines return an error value; C routines as
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the value of the function and Fortran routines in the last argument. C++
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functions do not return errors. If the default error handler is set to
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MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
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will be used to throw an MPI::Exception object.
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.sp
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Before the error value is returned, the current MPI error handler is
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called. By default, this error handler aborts the MPI job, except for
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I/O function errors. The error handler may be changed with
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MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
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may be used to cause error values to be returned. Note that MPI does not
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guarantee that an MPI program can continue past an error.
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.sp
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See the MPI man page for a full list of MPI error codes.
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.SH SEE ALSO
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.ft R
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.nf
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MPI_Publish_name
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MPI_Open_port
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