Strange use of "optimal" :) There are some strong and weak scaling experiments in Section 6 of the Firedrake paper -- http://arxiv.org/abs/1501.01809 -- which may guide your cores-to-DOFs intuition. Best, Andrew On 26 April 2016 at 21:18, Francis Poulin <fpoulin@uwaterloo.ca> wrote:

Hello again,

In case your curious, on my ubuntu machine with 2x8 cores I get, approximately,

np = 16 30 mins np = 8 35 mins np = 4 57 mins np = 2 ?? np = 1 ~4.5 hours

I don't think I'll necessarily try np = 2 but it does seem that 8 probably the optimal value for this case. I am sure that with higher resolution (or a third dimension) the efficiency would improve but it's already looking very good.

Francis

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