[R] Multicore computation in Windows network: How to set up Rmpi

[Thomas Brandenburger]

Samu,
Thanks you are a life saver.  Your efforts saved me a ton of time.  I went
through basically exactly the same process as you describe.  To summarize
the same issue you have I get the following phenomenon:
spawning appears to not happen the same every time.  How can you specify how
the nodes are being spawned?  Did you ever figure this out?  I see almost no
documentation anywhere on Windows deployments.

Thanks
Tom


Samu Mäntyniemi wrote:
> 
> Hello!
> 
> I finally got MPICH 1.06 + R 2.6.1 + Rmpi 0.5-5 working with multiple 
> computers. The key was to realize that the number of processes should be 
> one when launching Rgui using mpiexec and not the number of 
> master+slaves, as I had first wrongly understood.
> 
> However, I seem to have a new problem which I have not been able to 
> figure out:
> 
> After loading Rmpi, the first attempt to mpi.spawn.Rslaves() always 
> spawns the slaves on the local machine instead of on both machines. If I 
> close the slaves and spawn again, then one slave gets spawned on remote 
> machine. Each time I close and then spawn againg, the order of machines 
> is different, and eventually I get back to the situation where all 
> slaves are on the local machine. Continuing to do spawning and closing 
> seems to reveal a pattern. I can see similar behavior if I have more 
> than two machines, and it takes more spawn-close cycles to get all my 
> slave machines spawned on.
> 
> Below is an example session with two machines. This pattern shows 
> everytime I start R and run this script. How to control the spawning so 
> that I get everything right at the first call of mpi.spawn.Rslaves()?
> 
> Regards,
> 
> Samu
> 
> 

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