Wasim,
I am trying to run step-40 on my local system and match the performance
against the results given in the tutorial problem. I am running the
problem on a single processor. My total time is significantly less than
that given in the tutorial problem. But my output takes up around 50% of
the total time, which isn't the case in the tutorial problem.
I cannot figure out why my total time is significantly less than that in
the tutorial and why my output takes 50% of the total wall clock time.
I am attaching both results for reference.
Are you running in debug or release mode?
For reference, here is what I get in debug mode for cycle 3:
Cycle 3:
Number of active cells: 7096
Number of degrees of freedom: 31639
Solved in 11 iterations.
+---------------------------------------------+------------+------------+
| Total wallclock time elapsed since start | 5.84s | |
| | | |
| Section | no. calls | wall time | % of total |
+---------------------------------+-----------+------------+------------+
| assembly | 1 | 1.85s | 32% |
| output | 1 | 0.532s | 9.1% |
| refine | 1 | 2.01s | 34% |
| setup | 1 | 0.926s | 16% |
| solve | 1 | 0.52s | 8.9% |
+---------------------------------+-----------+------------+------------+
And here for release mode:
Cycle 3:
Number of active cells: 7096
Number of degrees of freedom: 31639
Solved in 11 iterations.
+---------------------------------------------+------------+------------+
| Total wallclock time elapsed since start | 1.07s | |
| | | |
| Section | no. calls | wall time | % of total |
+---------------------------------+-----------+------------+------------+
| assembly | 1 | 0.0412s | 3.9% |
| output | 1 | 0.204s | 19% |
| refine | 1 | 0.282s | 26% |
| setup | 1 | 0.0349s | 3.3% |
| solve | 1 | 0.506s | 47% |
+---------------------------------+-----------+------------+------------+
As a general rule, though, these tiny problems are not of great
interest. step-40 is written to be run on substantial numbers of
processes, on millions or billions of degrees of freedom.
Best
W.
--
------------------------------------------------------------------------
Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
--
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see
https://groups.google.com/d/forum/dealii?hl=en
---
You received this message because you are subscribed to the Google Groups "deal.II User Group" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/dealii/fdfaa242-bb4e-9283-bf63-429f74d77a72%40colostate.edu.
