MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuel d'utilisateur télécharger pdf (Page 7)

Using a Different MPI Build on UNIX

Operating Systems

1 Test your build by running the mpiexec executable. The build should be

ready to test if its bin/mpiexec and lib/libmpich.so are available in the

MPI installation location.

Following the example in “Building MPI” on page

2-6, /opt/mpich2/mpich2-1.0.8/bin/mpiexec and

/opt/mpich2/mpich2-1.0.8/lib/libmpich.so are ready to use, so you

can test the build with:

$ /opt/mpich2/mpich2-1.0.8/bin/mpiexec -n 4 hostname

2 Create an mpiLibConf function to direct Parellel Computing Toolbox to

use your new MPI. Write your mpiLibConf.m to return the appropriate

information for your build. For example:

function [primary, extras] = mpiLibConf

primary = '/opt/mpich2/mpich2-1.0.8/lib/libmpich.so';

extras = {};

The primary path must be valid on the cluster; and your

mpiLibConf.m Þle must be higher on the cluster workers’ path than

matlabroot/toolbox/distcomp/mpi. (Sending mpiLibConf.m as a Þle

dependency for this purpose does not work. You can get the mpiLibConf.m

function on the worker path by either moving the Þle into a directory on the

path, or by having the scheduler use cd in its command so that it starts the

MATLAB worker from within the directory that contains the function.)

3 Determine necessary daemons and command-line options.

• Determine all necessary daemons (often something like mpdboot or

smpd). The gforker build example in this section uses an MPI that needs

no services or daemons running on the cluster, but it can use only the

local machine.

• Determine the correct command-line options to pass to mpiexec.

4 Use one of the following options to set up your scheduler to use your new

MPI build:

• For the simplest case of the mpiexec scheduler, set up a conÞguration

to use the mpiexec executable from your new MPI build. It is crucial

that you use matching mpiexec, MPI library, and any daemons (if

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MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuel d'utilisateur Page 7