Question #95433 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/95433
Status: Open => Answered
Garth Wells proposed the following answer:
Nuno Lopes wrote:
> New question #95433 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/95433
>
> Hi!
>
> I've been updating my dolfwave code from dolfin 0.9.2 to 0.9.5.
> Apart from some CGAL problems it is working, and
> I'm able to run some of the demos now.
> I've noticed a major slowdown from 0.9.2 to 0.9.5 (in my codes)
> Is this a known issue?
>
Is the only substantial slow down in the cell assembly?
Are you using the '-O' flag with FFC? This was on by default, but now
seems to be off by default.
Garth
> I note that the solutions are the same for both versions.
> Using UMFPACK with factorized_solve I have
> the following summary of timings:
>
> dolfin 0.9.2:
> Summary of timings | Average time Total time Reps
> -----------------------------------------------------------
> Assemble cells | 0.0046482 6.87 1478
> Assemble exterior facets | 0.005 0.01 2
> Build sparsity | 9.4723e-05 0.14 1478
> Delete sparsity | 6.7659e-05 0.1 1478
> Init dof map | 0 0
> 11
> Init tensor | 6.7659e-06 0.01 1478
> LU solver | 0.02 0.02 1
> X:DOLFWAVE:END | 7.64 7.64 1
>
> and for dolfin 0.9.5:
> Summary of timings | Average time Total time Reps
> -----------------------------------------------------------
> Assemble cells | 0.011779 17.41 1478
> Assemble exterior facets | 0.005 0.01 2
> Build sparsity | 6.7659e-06 0.01 1478
> Delete sparsity | 0 0
> 1478
> Init tensor | 0 0
> 1478
> LU solver | 0.03 0.03 1
> X:DOLFWAVE:END | 85.12 85.12 1
>
> Any ideas?!
>
> N.Lopes
>
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