Charm++ parallel programming system

[Maksym Planeta <mplaneta AT os.inf.tu-dresden.de>]

Dear Charm++ group,

as far as I understand, the main mode of operation of AMPI is running it 
in oversubscribed mode.

Does it mean that I should create less processes (+p parameter), than I 
have cores? And I should create at least as many virtual processes (+vp) 
as I have cores, or even more?

I tried to create 64 processes on 8 nodes and specified +vp 512. What I 
observed is that at each node there were 8 processes created, and the 
rest 16 cores of each 24-cores node stayed unoccupied. Did I do 
something wrong?

The way how I launched the program is following:

./charmrun +p64 ++mpiexec ++remote-shell $HOME/script.sh ./lulesh2.0 
+vp512 -i 300

The script basically only does "exec srun -N 8 -n $*"

--
Regards,
Maksym Planeta

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