200 lines
6.5 KiB
Groff
200 lines
6.5 KiB
Groff
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.TH "MPI_COMM_IDUP" "3" "Feb 14, 2025" "" "Open MPI"
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.sp
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\fI\%MPI_Comm_idup\fP — Start the nonblocking duplication of an existing
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communicator with all its cached information.
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.SH SYNTAX
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.SS C Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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#include <mpi.h>
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int MPI_Comm_idup(MPI_Comm comm, MPI_Comm *newcomm, MPI_Request *request)
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE MPI
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! or the older form: INCLUDE \(aqmpif.h\(aq
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MPI_COMM_IDUP(COMM, NEWCOMM, REQUEST, IERROR)
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INTEGER COMM, NEWCOMM, REQUEST, IERROR
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SS Fortran 2008 Syntax
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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USE mpi_f08
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MPI_Comm_idup(comm, newcomm, request, ierror)
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TYPE(MPI_Comm), INTENT(IN) :: comm
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TYPE(MPI_Comm), INTENT(OUT) :: newcomm
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TYPE(MPI_Request), INTENT(OUT) :: request
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INTEGER, OPTIONAL, INTENT(OUT) :: ierror
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SH INPUT PARAMETER
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.INDENT 0.0
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.IP \(bu 2
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\fBcomm\fP: Communicator (handle).
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.UNINDENT
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.SH OUTPUT PARAMETERS
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.INDENT 0.0
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.IP \(bu 2
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\fBnewcomm\fP: Copy of comm (handle).
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.IP \(bu 2
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\fBrequest\fP: Communication request (handle).
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.IP \(bu 2
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\fBierror\fP: Fortran only: Error status (integer).
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.UNINDENT
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.SH DESCRIPTION
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.sp
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\fI\%MPI_Comm_idup\fP starts the nonblocking duplication of an existing
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communicator comm with associated key values. For each key value, the
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respective copy callback function determines the attribute value
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associated with this key in the new communicator; one particular action
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that a copy callback may take is to delete the attribute from the new
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communicator. Returns in newcomm a new communicator with the same group,
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any copied cached information, but a new context (see the
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“Functionality” subsection of the “Caching” section in the “Groups,
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Contexts, and Communicators” chapter in the \fI\%MPI Standard\fP). The communicator returned in
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\fInewcomm\fP will not be available until the request is complete.
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.sp
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The completion of a communicator duplication request can be determined
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by calling any of \fI\%MPI_Wait\fP, \fI\%MPI_Waitany\fP, \fI\%MPI_Test\fP, or \fI\%MPI_Testany\fP with
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the request returned by this function.
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.SH NOTES
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.sp
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This operation is used to provide a parallel library call with a
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duplicate communication space that has the same properties as the
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original communicator. This includes any attributes (see below) and
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topologies (see the “Process Topologies” chapter in the \fI\%MPI Standard\fP).
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This call is valid even if there are pending point\-to\-point
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communications involving the communicator comm. A typical call might
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involve an \fI\%MPI_Comm_idup\fP at the beginning of the parallel call, and an
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\fI\%MPI_Comm_free\fP of that duplicated communicator at the end of the call.
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Other models of communicator management are also possible.
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.sp
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This call applies to both intra\- and intercommunicators.
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.sp
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Note that it is not defined by the MPI standard what happens if the
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attribute copy callback invokes other MPI functions. In Open MPI, it is
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not valid for attribute copy callbacks (or any of their children) to add
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or delete attributes on the same object on which the attribute copy
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callback is being invoked.
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.SH ERRORS
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.sp
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Almost all MPI routines return an error value; C routines as the return result
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of the function and Fortran routines in the last argument.
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.sp
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Before the error value is returned, the current MPI error handler associated
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with the communication object (e.g., communicator, window, file) is called.
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If no communication object is associated with the MPI call, then the call is
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considered attached to MPI_COMM_SELF and will call the associated MPI error
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handler. When MPI_COMM_SELF is not initialized (i.e., before
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\fI\%MPI_Init\fP/\fI\%MPI_Init_thread\fP, after \fI\%MPI_Finalize\fP, or when using the Sessions
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Model exclusively) the error raises the initial error handler. The initial
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error handler can be changed by calling \fI\%MPI_Comm_set_errhandler\fP on
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MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI
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argument to mpiexec or info key to \fI\%MPI_Comm_spawn\fP/\fI\%MPI_Comm_spawn_multiple\fP\&.
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If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN
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error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error
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handler is called for all other MPI functions.
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.sp
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Open MPI includes three predefined error handlers that can be used:
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.INDENT 0.0
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.IP \(bu 2
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\fBMPI_ERRORS_ARE_FATAL\fP
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Causes the program to abort all connected MPI processes.
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.IP \(bu 2
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\fBMPI_ERRORS_ABORT\fP
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An error handler that can be invoked on a communicator,
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window, file, or session. When called on a communicator, it
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acts as if \fI\%MPI_Abort\fP was called on that communicator. If
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called on a window or file, acts as if \fI\%MPI_Abort\fP was called
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on a communicator containing the group of processes in the
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corresponding window or file. If called on a session,
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aborts only the local process.
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.IP \(bu 2
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\fBMPI_ERRORS_RETURN\fP
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Returns an error code to the application.
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.UNINDENT
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.sp
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MPI applications can also implement their own error handlers by calling:
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Comm_create_errhandler\fP then \fI\%MPI_Comm_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_File_create_errhandler\fP then \fI\%MPI_File_set_errhandler\fP
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.IP \(bu 2
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\fI\%MPI_Session_create_errhandler\fP then \fI\%MPI_Session_set_errhandler\fP or at \fI\%MPI_Session_init\fP
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.IP \(bu 2
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\fI\%MPI_Win_create_errhandler\fP then \fI\%MPI_Win_set_errhandler\fP
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.UNINDENT
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.sp
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Note that MPI does not guarantee that an MPI program can continue past
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an error.
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.sp
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See the \fI\%MPI man page\fP for a full list of \fI\%MPI error codes\fP\&.
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.sp
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See the Error Handling section of the MPI\-3.1 standard for
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more information.
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.sp
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\fBSEE ALSO:\fP
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.INDENT 0.0
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.INDENT 3.5
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.INDENT 0.0
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.IP \(bu 2
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\fI\%MPI_Comm_dup\fP
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.IP \(bu 2
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\fI\%MPI_Comm_dup_with_info\fP
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.SH COPYRIGHT
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2003-2025, The Open MPI Community
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.\" Generated by docutils manpage writer.
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