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v3.1.x: MPI_Comm_spawn_multiple.3in: update Fortran string array notes #5026

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Apr 6, 2018
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v3.1.x: MPI_Comm_spawn_multiple.3in: update Fortran string array notes #5026

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11 changes: 10 additions & 1 deletion ompi/mpi/man/man3/MPI_Comm_spawn_multiple.3in
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
.\" -*- nroff -*-
.\" Copyright 2013 Los Alamos National Security, LLC. All rights reserved.
.\" Copyright (c) 2010 Cisco Systems, Inc. All rights reserved.
.\" Copyright (c) 2010-2018 Cisco Systems, Inc. All rights reserved
.\" Copyright 2006-2008 Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" $COPYRIGHT$
Expand Down Expand Up @@ -249,6 +249,15 @@ parameter; see MPI_Comm_spawn(3)'s description of the
.I argv
parameter for more details.
.sp
MPI-3.1 implies (but does not directly state) that the argument
\fIarray_of_commands\fP must be an array of strings of length
\fIcount\fP. Unlike the \fIarray_of_argv\fP parameter,
\fIarray_of_commands\fP does not need to be terminated with a NULL
pointer in C or a blank string in Fortran. Older versions of Open MPI
required that \fIarray_of_commands\fP be terminated with a blank
string in Fortran; that is no longer required in this version of Open
MPI.
.sp
Calling MPI_Comm_spawn(3) many times would create many sets of
children with different MPI_COMM_WORLDs, whereas
MPI_Comm_spawn_multiple creates children with a single MPI_COMM_WORLD,
Expand Down