HPC/Applications/matlab/Parallel

Introduction

MathWorks offers two components to operate MATLAB in parallel.

1. The Parallel Computing Toolbox (PCT).

   Provides the language features and capabilities for execution on a single machine.

2. The MATLAB Distributed Computing Server – MDCS, formerly known as MDCE.

   Requires and extends the Toolbox for use across multiple machines.

The Parallel Computing Toolbox:

• Provides high-level constructs (such as parallel for-loops, special array types, and parallelized numerical algorithms) to parallelize applications without CUDA or MPI programming.
• Supports CUDA-enabled NVIDIA GPUs (available on Carbon login nodes and gen3 nodes).
• Supports up to twelve workers (computational engines) to execute applications locally on a multicore machine.
• Can run parallel applications interactively or in batch.

Under MDCS,

• Applications using PCT can run on a cluster (across multiple nodes) without changing the code.

Concepts

• http://www.mathworks.com/help/distcomp/
• or http://www.mathworks.com/help/releases/R2013a/distcomp/
• http://www.mathworks.com/help/distcomp/release-notes.html?searchHighlight=matlabpool

  parpool: New command-line interface (replaces matlabpool)

• http://www.mathworks.com/help/mdce/release-notes.html?searchHighlight=matlabpool

  Same, plus: Discontinued Support for parallel.cluster.Mpiexec

  Automatic start of a parallel pool when executing code that uses parfor or spmd

Caveats

An error has occurred processing your job, see below.
Post job file processing error; job 435379.sched1.carboncluster on host n189/7+n189/6+…+n187/0

Unable to copy file /var/spool/torque/spool/435379.sched1.carboncluster.OU to /home/stern/somedir/Job1/Job1.log
*** error from copy
/bin/cp: cannot create regular file `/home/stern/somedir/Job1/Job1.log': No such file or directory
*** end error output
Output retained on that host in: /var/spool/torque/undelivered/435379.sched1.carboncluster.OU