Orion Multisystems and Parallel Computing Toolkit

Orion Multisystem's cluster workstations are ideally suited for running gridMathematica. The head node runs the master kernel, and each compute node runs one slave kernel. The frontend through which a computation is monitored, can run on the head node or on the user's workstation, if the cluster is used as a server.

The partnership between Wolfram Research and Orion Multisystem allows customers to obtain gridMathematica at particularly attractive conditions.

This page contains hints and examples for users of gridMathematica on these machines; the code was developed on a DT-12 workstation.

Launching Remote Kernels

You can use rsh or ssh to launch kernels from the head node on the compute nodes. On the private cluster network between the nodes, rsh is not a security risk and can be enabled even if rsh is disabled on the outside interface of the head node.

To enable rsh, open a terminal window as root and go to the directory /etc/orionmulti/xinetd.d. Check the file rsh. If it contains a line

disable = yes

rsh will not work. If the file is a symbolic link to the head node's copy, rsh -> ../head_node/xinetd.d/rsh, replace it by a proper copy and then change the line to read

disable = no

Then, restart the compute nodes with

/etc/init.d/orion_clusterstart restart

and verify that you can rsh into the compute nodes, for example with

rsh n1 date

This notebook contains commands suitable for launching remote kernels on the compute nodes, using Mathematica 5.1 and Parallel Computing Toolkit 2.

OrionLauncher.nb

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