193 lines
5.4 KiB
Groff
193 lines
5.4 KiB
Groff
.\" Man page generated from reStructuredText.
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.TH "MPI_GROUP_INCL" "3" "Feb 14, 2025" "" "Open MPI"
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.sp
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\fI\%MPI_Group_incl\fP — Produces a group by reordering an existing group and
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taking only listed members.
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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_Group_incl(MPI_Group group, int n, const int ranks[],
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MPI_Group *newgroup)
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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_GROUP_INCL(GROUP, N, RANKS, NEWGROUP, IERROR)
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INTEGER GROUP, N, RANKS(*), NEWGROUP, 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_Group_incl(group, n, ranks, newgroup, ierror)
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TYPE(MPI_Group), INTENT(IN) :: group
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INTEGER, INTENT(IN) :: n, ranks(n)
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TYPE(MPI_Group), INTENT(OUT) :: newgroup
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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 PARAMETERS
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.INDENT 0.0
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.IP \(bu 2
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\fBgroup\fP : Group (handle).
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.IP \(bu 2
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.INDENT 2.0
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.TP
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.B \fBn\fP
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Number of elements in array ranks (and size of
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newgroup)(integer).
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.UNINDENT
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.IP \(bu 2
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.INDENT 2.0
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.TP
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.B \fBranks\fP
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Ranks of processes in group to appear in newgroup (array of
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integers).
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.UNINDENT
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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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.INDENT 2.0
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.TP
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.B \fBnewgroup\fP
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New group derived from above, in the order defined by
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ranks (handle).
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.UNINDENT
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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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The function \fI\%MPI_Group_incl\fP creates a group group_out that consists of
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the n processes in group with ranks rank[0], …, rank[n\-1]; the process
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with rank i in group_out is the process with rank ranks[i] in group.
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Each of the n elements of ranks must be a valid rank in group and all
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elements must be distinct, or else the program is erroneous. If n = 0,
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then group_out is MPI_GROUP_EMPTY. This function can, for instance, be
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used to reorder the elements of a group.
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.SH NOTE
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.sp
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This implementation does not currently check to ensure that there are no
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duplicates in the list of ranks.
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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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\fI\%MPI_Group_compare\fP
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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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