Dear Dustin,
I had a look at your program on my machine with the most recent
development version of deal.II. Here is the final timer output in
release mode:
+---------------------------------------------+------------+------------+
| Total wallclock time elapsed since start | 1.02s | |
| | | |
| Section | no. calls | wall time | % of total |
+---------------------------------+-----------+------------+------------+
| Setup | 1 | 0.618s | 60.% |
| copy_sparsity_pattern | 1 | 0.0557s | 5.4% |
| setup_intial_fe_distribution | 1 | 0.0119s | 1.2% |
| setup_system | 1 | 0.606s | 59.% |
+---------------------------------+-----------+------------+------------+
As you can see, the copy operation is very cheap on my machine at
0.0557s versus 20.2s on your machine. When looking at the profiles, I
cannot see anything suspicious either. My primary suspecion right now is
that you are on an old version of deal.II where we had bad code in that
function. (But I don't remember having changed anything during the last
year.) What version are you using?
Best,
Martin
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