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Top Forums Programming Help with make this Fortran code more efficient (in HPC manner) Post 302566610 by otheus on Thursday 20th of October 2011 04:52:31 PM
Old 10-20-2011
This one's not too hard. You're summing up all the subexpressions of I,k,j,l. Each iteration can be dine on a separate node and "reduced" to a single sum.

Perhaps the easiest way would be to parallelize the outermost loop, splitting the task among N processors and summing each result.

Do you have an MPI environment?
 

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binfmtf(1)							     binfmt_C								binfmtf(1)

NAME
binfmtf-interpreter - binfmt_misc fortran handler SYNOPSIS
binfmtf-interpreter fortran-source-file-name [command-line opions ...] DESCRIPTION
binfmtf-interpreter compiles a fortran source file specified on the command-line using the g77 compiler, and executes the resulting file. It is designed to be used as a handler for binfmt_misc handler, which is a system used in Linux for handling arbitrary files as executa- bles. The command-line options are passed on to the compiled binary. FILE MAGIC
There is a requirement for Fortran source files to have the magic characters c BINFMTF: at the beginning of the file. That line also is used to specify the additional command-line options for Fortran compiler. ENVIRONMENT
G77 The compiler used. The default is to use g77 BINFMTCTMPDIR Temporary directory used for binary and execution. Falls back to $TMPDIR $TEMPDIR or /tmp BINFMTC_DEBUG enables debug output if set. BINFMTC_G77_OPTS Additional G77 options. Use BINFMTC_DEBUG to verify the options being passed on to g77. The default is -O2 -Wall AUTHOR
Junichi Uekawa (dancer@debian.org) Upstream page is available at http://www.netfort.gr.jp/~dancer/software/ SEE ALSO
binfmtasm-interpreter(1), binfmtc-interpreter(1), binfmtcxx-interpreter(1), binfmtf95-interpreter(1), binfmtgcj-interpreter(1) binfmt_misc Dancer 2005 Jun 4 binfmtf(1)
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