Open MPI is an open source implementation of MPI (message-passing
interface), the industry-standard specification for writing
message-passing programs. Message passing is a programming model that
gives the programmer explicit control over interprocess communication.
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The MPI specification was developed by the MPI Forum, a group of
software developers, computer vendors, academics, and computer-science
researchers whose goal was to develop a standard for writing
message-passing programs that would be efficient, flexible, and
portable.
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The outcome, known as the MPI Standard, was first published in 1993;
its most recent version (MPI-2) was published in July 1997. Open MPI
1.2 includes all MPI 1.2-compliant and MPI 2-compliant routines.
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For more information about Open MPI, see the following URL:
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http://www.open-mpi.org
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The MPI standards are available at the following URL:
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http://www.mpi-forum.org
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.SHMANPAGESYNTAX
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Man pages for Open MPI and Open MPI I/O routines are named according to C syntax, that is, they begin with the prefix "MPI_", all in uppercase, and the first letter following the "MPI_" prefix is also uppercase. The rest of the letters in the routine are all lowercase, for example, "MPI_Comm_get_attr".
.SHENVIRONMENT
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To fine-tune your Open MPI environment, you can either use arguments to the \fImpirun\fP, \fIorterun\fP, or \fImpiexec\fP commands, or you can use MCA parameters.
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For more information on arguments, see the orterun.1 man page.
For a complete listing of MCA parameters and their descriptions, issue the command \fIompi_info -h\fP or \fIompi_info -param all all\fP. This information also appears in the FAQ on the Open MPI web site at:
