Upgrade macos
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Bassem Girgis
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.\" -*- nroff -*-
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.\" Copyright (c) 2010-2015 Cisco Systems, Inc. All rights reserved.
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.\" Copyright 2006-2008 Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.\" $COPYRIGHT$
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.TH MPI_Init 3 "Mar 26, 2019" "4.0.1" "Open MPI"
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.SH NAME
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\fBMPI_Init\fP \- Initializes the MPI execution environment
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.\" Man page generated from reStructuredText.
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.
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.TH "MPI_INIT" "3" "Feb 14, 2025" "" "Open MPI"
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.
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.nr rst2man-indent-level 0
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.
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.de1 rstReportMargin
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\\$1 \\n[an-margin]
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level \\n[rst2man-indent-level]
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level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
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-
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\\n[rst2man-indent1]
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\\n[rst2man-indent2]
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..
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.de1 INDENT
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.\" .rstReportMargin pre:
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. RS \\$1
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. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
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. nr rst2man-indent-level +1
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.\" .rstReportMargin post:
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..
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.de UNINDENT
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. RE
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.\" indent \\n[an-margin]
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.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
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.nr rst2man-indent-level -1
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.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
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.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
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..
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.sp
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\fI\%MPI_Init\fP — Initializes the MPI execution environment
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.SH SYNTAX
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.ft R
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.SH C 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_Init(int *\fIargc\fP, char ***\fIargv\fP)
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int MPI_Init(int *argc, char ***argv)
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.ft P
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.fi
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.SH INPUT PARAMETERS
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.ft R
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.TP 1i
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argc
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C/C++ only: Pointer to the number of arguments.
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.TP 1i
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argv
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C/C++ only: Argument vector.
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.SH OUTPUT PARAMETER
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.ft R
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.TP 1i
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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 routine, or MPI_Init_thread, must be called before most other MPI
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routines are called. There are a small number of exceptions, such as
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MPI_Initialized and MPI_Finalized. MPI can be initialized at most
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once; subsequent calls to MPI_Init or MPI_Init_thread are erroneous.
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.sp
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All MPI programs must contain a call to MPI_Init or
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MPI_Init_thread. Open MPI accepts the C/C++ \fIargc\fP and \fIargv\fP
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arguments to main, but neither modifies, interprets, nor distributes
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them:
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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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{
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/* declare variables */
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MPI_Init(&argc, &argv);
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/* parse arguments */
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/* main program */
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MPI_Finalize();
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}
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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_INIT(IERROR)
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INTEGER IERROR
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.ft P
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.fi
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.SH NOTES
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.ft R
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The Fortran version does not have provisions for \fIargc\fP and
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\fIargv\fP and takes only IERROR.
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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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The MPI Standard does not say what a program can do before an MPI_Init
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or after an MPI_Finalize. In the Open MPI implementation, it should do
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.nf
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.ft C
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USE mpi_f08
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MPI_Init(ierror)
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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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\fBargc\fP: C only: Pointer to the number of arguments.
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.IP \(bu 2
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\fBargv\fP: C only: Argument vector.
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.UNINDENT
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.SH OUTPUT PARAMETER
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.INDENT 0.0
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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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This routine, or \fI\%MPI_Init_thread\fP, must be called before most other MPI
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routines are called. There are a small number of errors, such as
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\fI\%MPI_Initialized\fP and \fI\%MPI_Finalized\fP\&. MPI can be initialized at most once;
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subsequent calls to \fI\%MPI_Init\fP or \fI\%MPI_Init_thread\fP are erroneous.
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.sp
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All MPI programs must contain a call to \fI\%MPI_Init\fP or \fI\%MPI_Init_thread\fP\&.
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Open MPI accepts the C \fIargc\fP and \fIargv\fP arguments to main, but neither
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modifies, interprets, nor distributes them:
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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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/* declare variables */
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MPI_Init(&argc, &argv);
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/* parse arguments */
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/* main program */
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MPI_Finalize();
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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 NOTES
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.sp
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The Fortran version does not have provisions for \fIargc\fP and \fIargv\fP and
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takes only IERROR.
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.sp
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The MPI Standard does not say what a program can do before an \fI\%MPI_Init\fP
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or after an \fI\%MPI_Finalize\fP\&. In the Open MPI implementation, it should do
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as little as possible. In particular, avoid anything that changes the
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external state of the program, such as opening files, reading standard
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input, or writing to standard output.
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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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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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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_Init_thread
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MPI_Initialized
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MPI_Finalize
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MPI_Finalized
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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_Init_thread\fP
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.IP \(bu 2
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\fI\%MPI_Initialized\fP
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.IP \(bu 2
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\fI\%MPI_Finalize\fP
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.IP \(bu 2
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\fI\%MPI_Finalized\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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.
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