trac bug 850
This commit was SVN r13437.
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@ -1,6 +1,6 @@
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.\"Copyright 2006, Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
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.\"Copyright 2007, Sun Microsystems, Inc.
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.\" Copyright (c) 1996 Thinking Machines Corporation
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.TH MPI_Allreduce 3OpenMPI "September 2006" "Open MPI 1.2" " "
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.TH MPI_Allreduce 3OpenMPI "March 2007" "Open MPI 1.2" " "
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.SH NAME
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\fBMPI_Allreduce\fP \- Combines values from all processes and distributes the result back to all processes.
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@ -107,7 +107,7 @@ CALL MPI_REDUCE(sum, c, n, MPI_REAL, MPI_SUM, 0, comm, ierr)
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RETURN
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.fi
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.SH USE OF IN-PLACE OPTION
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When the communicator is an intracommunicator, you can perform an all-reduce operation in-place (the output buffer is used as the input buffer). Use the variable MPI_IN_PLACE as the value of both \fIsendbuf\fR and \fIrecvbuf\fR.
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When the communicator is an intracommunicator, you can perform an all-reduce operation in-place (the output buffer is used as the input buffer). Use the variable MPI_IN_PLACE as the value of \fIsendbuf\fR at all processes.
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.sp
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Note that MPI_IN_PLACE is a special kind of value; it has the same restrictions on its use as MPI_BOTTOM.
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.sp
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