[Swift-devel] MPICH/Coasters

[Allan Espinosa]

Sounds like cool stuff.  So essentially they modularized the process manager
component of the mpich2 implementation (or a lamd daemon / manager) to be able
to launch other processes.  

With this framework,  can coasters directly access low-level interconnet
interfaces instead of plain (or GSI) sockets?

On Mon, Jul 26, 2010 at 01:47:27PM -0500, Justin M Wozniak wrote:
> Hello
> 	I just had a meeting with Pavan to talk about what we can do to run
> MPI jobs from Coasters given the new MPICH/Hydra features.  He's
> making a few modifications to MPICH to support this and they should
> be available soon.
> 
> Background on Hydra:
> 
> http://wiki.mcs.anl.gov/mpich2/index.php/Using_the_Hydra_Process_Manager#Bootstrap_Servers
> http://wiki.mcs.anl.gov/mpich2/index.php/Hydra_Process_Management_Framework
> 
> Here's the basic idea so far:
> 
> * The CoasterService locally runs an mpiexec;
> * mpiexec prints a list of (proxy) command lines, then listens;
> * The CoasterService passes each command-line to a worker;
> * The worker launches the proxy;
> * The proxy connects back to mpiexec;
> * mpiexec and the proxies complete the user job;
> * mpiexec and the proxies shut down.
> 
> So, analogous to "manual Coasters", this is "manual MPICH", because
> Coasters is responsible for launching the proxies.
> 
> 	Justin
> 
> -- 
> Justin M Wozniak