48 lines
1.8 KiB
Groff
48 lines
1.8 KiB
Groff
.\" -*- nroff -*-
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.\" Copyright 2010 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_Comm_compare 3 "Mar 26, 2019" "4.0.1" "Open MPI"
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.SH NAME
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\fBMPI_Comm_compare \fP \- Compares two communicators.
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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_Comm_compare(MPI_Comm \fIcomm1\fP, MPI_Comm\fI comm2\fP, int\fI *result\fP)
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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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comm1
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Comm1 (handle).
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.TP 1i
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comm2
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Comm2 (handle).
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.SH OUTPUT PARAMETERS
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.ft R
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.TP 1i
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result
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Result of comparison (integer).
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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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MPI_IDENT results if and only if comm1 and comm2 are handles for the same object (identical groups and same contexts). MPI_CONGRUENT results if the underlying groups are identical in constituents and rank order; these communicators differ only by context. MPI_SIMILAR results of the group members of both communicators are the same but the rank order differs. MPI_UNEQUAL results otherwise.
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.SH ERRORS
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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.
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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 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.
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