On 11/16/2016 04:31 AM, Ashkan Dorostkar wrote:
Could you elaborate on why I am using twice more memory on each node if I use
more than one core per node?
If you use two cores per node, then you are running two programs within the
same amount of memory, each of which will allocate their own data structures etc.
I have tried using around 300 nodes which means roughly one million DOFs per
node but still it fails.
This is the reason I don’t think the problem is related to memory.
This is a lot of unknowns. Depending on your application, you need to expect
10 kB of memory per unknown, sometimes even more. So trying to solve 1 million
unknowns per node is a lot. Our rule of thumb is usually to use about 100,000
unknowns per MPI process.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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