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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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IPCLUSTER(1)															      IPCLUSTER(1)

NAME
ipcluster - IPython parallel computing cluster control tool SYNOPSIS
ipcluster {piexec,local,mpirun,pbs,ssh} [options] DESCRIPTION
ipcluster is a control tool for IPython's parallel computing functions. IPython cluster startup. This starts a controller and engines using various approaches. Use the IPYTHONDIR environment variable to change your IPython directory from the default of .ipython or _ipython. The log and security subdirectories of your IPython directory will be used by this script for log files and security files. POSITIONAL ARGUMENTS
The first positional argument should be one of: {mpiexec, local, mpirun, pbs, ssh}, which are the available cluster types. For detailed help on each, type "ipcluster TYPE --help". Briefly: local run a local cluster mpirun run a cluster using mpirun (mpiexec also works) mpiexec run a cluster using mpiexec (mpirun also works) pbs run a pbs cluster ssh run a cluster using ssh, should have ssh-keys setup OPTIONS
-h, --help show help message and exit EXAMPLE
ipcluster local -n 4 This command will start 4 IPython engines on the local computer. SEE ALSO
ipython(1),ipcontroller(1),ipengine(1) AUTHOR
ipcluster is a tool that ships with IPython, created by the IPython Development Team. This manual page was written by Stephan Peijnik <debian@sp.or.at>, for the Debian project (but may be used by others). Modified by Fer- nando Perez <Fernando.Perez@berkeley.edu> for inclusion in IPython. October 28, 2008 IPCLUSTER(1)
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