Charm++ parallel programming system

[Olivier Demengeon <olivier.demengeon AT inria.fr>]

Hello,

Phil Miller wrote:
> On Tue, Jul 20, 2010 at 06:08, Olivier Demengeon
> <olivier.demengeon AT inria.fr>
>   wrote:
>    
> > Hello,
> >
> > I hope i post this mail at the right place, i look for help on charm++
> > freezing.
> >
> > I have a problem with charmrun freezing when gathering cpu tolopology.
> >
> > I use namd (2.7b3) on IB with charm++. I have a cluster with 32 nodes. Each
> > nodes have 8 cores.
> >      
> Is your charm++ build 'net-linux-x86_64-ibverbs' then?
>
>    
It seems so, it's charm++ provides by namd 2.7b3 IB version
> > When I use 11 nodes or less, asking 8 process per node everything work fine.
> > When i try to use more than 11 nodes, still asking 8 process per compter,
> > charmrun start to sometime hang at gathering cpu topology. More I have node,
> > more the chance of freeze increase.
> >
> > Here the commande line I use for 11 nodes :
> >     /charmrun ++verbose +p88 ++nodelist nodes ++scalable-start ++batch 2
> > ./namd2<file>
> >      
> Could you post the output of this command to the list? Could you also
> try it without the "++batch 2" argument? For 32 nodes, no batching
> should be needed.
>
>    
I have used batching, because i had some timeout when too much ssh 
connection was used
> Also, does your cluster have MPI installed, and if so what
> implementation? A recent feature in Charm++, included with NAMD 2.7b3,
> allows use of some MPI system's startup process to launch Charm++
> programs.
>
> Phil
>
>    

Thx a lot for you answer,
Best regards,
Olivier Demengeon

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