Hi Pete,
The difference may be that the NEW version uses
a DynamicSparsityPattern while the OLD only guesses on the size
with, dof_handler.max_couplings_between_dofs(). Apparently with 3d
problems the function overestimates. Presently DynamicSparsityPattern
is used in step-8, but, not in step-17.
I definitely agree that you should NEVER use
max_couplings_between_dofs() in 3D. As you see, it overestimates by a
factor of 20 which is also my experience. I actually think we should put
an assertion into this function in 3D that forbids its use in 3D. People
should use dynamic sparsity patterns.
Best,
Martin
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