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Cluster 2 server units to run star with mpi?

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Old   August 16, 2017, 01:58
Default Cluster 2 server units to run star with mpi?
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Bob Comstock
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Hello Everyone,

I got 2 server units each with centos and star ccm+. I have a network switch with gigabit ethernet capability (as do the servers). They have 10gbit ethernet cards too just in case.

I want to cluster them together to run star but I'm not exactly sure on where to start. From some internet searching it looks like this will have to be done via setting up MPI with file sharing and such on each server. I see a lot of support and instructions on how to set up MPI or openMPI etc but I'm not sure which one to go for exactly and how it'll be implemented with star, wondering if there's a specific one that works best with star perhaps? I'm hoping to cluster them such that one is a frontend node and one is a compute node and it would be nice to still use the star gui.

Tried using Pelican HPC and it doesn't seem to be ideal for what I'm looking for.

I'm using a POD key too btw.

Any input would be appreciated!

Bob
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Old   August 16, 2017, 20:05
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You can either use OpenMPI or Platform MPI, which comes with star. You must install OpenMPI yourself if you want to use it.

You will have to have both machines share a directory somehow. This can be accomplished with NFS or with SSHFS, both are free. There are lots of guides around on doing this.

Install star on both machines in the same directory (or if not at least provide an alias for the starccm+ binary on both machines).

Both machines must be connected with a public-key authenticated ssh session. Again, lots of tutorials on this around the internet.

Then just make a text file with a list of the machines hostnames for each processor. For example, two quad-core machines would have a file:

machine1
machine1
machine1
machine1
machine2
machine2
machine2
machine2

Then just launch star with whatever script you want to use, you will need to provide the hosts file made above as an argument. Check the user guide on parallel execution for the syntax, don't know it offhand.

You can of course enter this info into the GUI instead, but I wouldn't recommend that for this type of machine. Better to have no frontend on a computing machine.
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