Charm++ parallel programming system

[Jim Phillips <jim AT ks.uiuc.edu>]

A 25% speedup compared to what?  -Jim

On Thu, 8 Sep 2011, Bennion, Brian wrote:

> Hello,
>
> Compilation of all the suggested versions of charm++ have been completed.
> They were:
> mpi-linux-x86_64
> mpi-linux-x86_64 smp
> net-linux-x86_64 ivberbs
> net-linux-x86_64 ibverbs smp
>
> It appears that the first charmm build is the best for namd2.8.  I saw a 
> 25% speedup on my regular jobs using the same processor counts.  No 
> extra tricks were employed in compiling charm++ or namd2.8.
>
> The ibverbs version did compile for charm++ and namd2.8 and was even 
> able to start.  however, sockets closed prematurely on some node and the 
> whole things burns to the ground.
>
> Two quick thoughts here.  First, looking at the charm.XXXXX files that 
> are created, they look for some /tmp/charm.XXXX directories that are not 
> going to be available.  The tmp filesystem goes by username it 
> /tmp/bennion1/XXXXX Second, I will check with our admins to see if using 
> ib layer is even permissible.
>
> Brian
>
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