Hi Dustin,
Thanks for your file. This is indeed a bug in deal.II. Our algorithms
for copying the sparsity pattern contain a part that scales
quadratically in the number of rows in case most of the rows are empty,
as is the case with some of your sparsity patterns. This is very bad if
there are many rows. When using a patch, the run time in release mode of
copy_sparsity_pattern goes from over 20s on my machine to 0.328s. A
patch addressing this issue has been published on the deal.II site:
https://github.com/dealii/dealii/pull/3040
Best,
Martin
On 31.08.2016 13:20, Dustin Kumor wrote:
Dear all,
some additional information. Out of interest I switched back to the
last release version of the deal.ii library 8.4.1 and made a run with
this version. The problem is still there and even worse. I attached
again the two log files for debug and release mode respectively.
Best
Dustin
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