Charm++ parallel programming system

[Gengbin Zheng <zhenggb AT gmail.com>]

In one scenario we encountered before, we found that the contention (given that all processes are trying to resolve their IP address at the same time) to the DNS server makes it incredibly slow. Re-configuring DNS server properly should fix the problem.

Gengbin

On Tue, Jul 20, 2010 at 8:08 AM, 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.

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>

Best regards,
Olivier Demengeon


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