MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuale Utente Scaricare il pdf (Pagina 25)

Use Different MPI Builds on UNIX

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.

Follow ing the example in “Build MP I ” on p age 2-6,

/opt/mpich2/mpich2-1.4.1p1/bin/mpiexec and

/opt/mpich2/mpich2-1.4.1p1/lib/libmpich.so are ready to use, so you

can test the build w ith :

$ /opt/mpich2/mpich2-1.4.1p1/bin/mpiexec -n 4 hostname

2 Create an mpiLibConf function to direct Parallel Computing Toolbox to

useyournewMPI.Writeyour

mpiLibConf.m to return the appropriate

information for your build. For example:

function [primary, extras] = mpiLibCon f

primary = '/opt/mpich2/mpich2-1.4.1p1/lib/libmpich.so';

extras = {};

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

mpiLibConf.m file must be higher on the cluster w orkers’ path than

matlabroot/toolbox/distcomp/mpi.(SendingmpiLibConf.m as a file

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

mpiLibConf.m

function on the worker path by either moving the file into a folder on the

path, or by having the scheduler use

cd in its command so that it starts the

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

3 Determine n ecessary daemons and command-line options.

• Determine all necessary daemons (ofte n som ething like

mpdboot or

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

no services or daemons running on the cluster, but it can u se 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 u p a configuration

to use the

mpiexec executable from your new MPI build. It is crucial

that you use matching

mpiexec, MPI library, and any daem o ns (if

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MATLAB DISTRIBUTED COMPUTING SERVER 4 - SYSTEM ADMINISTRATORS GUIDE Manuale Utente Pagina 25