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[Anders Logg <question149875@xxxxxxxxxxxxxxxxxxxxx>]

Question #149875 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/149875

    Status: Open => Answered

Anders Logg proposed the following answer:
On Mon, Mar 21, 2011 at 03:15:37PM -0000, Dupront wrote:
> Question #149875 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/149875
>
>     Status: Answered => Open
>
> Dupront is still having a problem:
>
> > > But I don't understand what Reps=11 means for Assemble
> > > cells.
> >
> > This is the number of times integrals over cells have been assembled.
>
>
> Thank you !
> Why 11 times ?

I suspect 2 x 5 assemblies of the Jacobian matrix and residual vector
+ a final assembly of the residual vector to check for convergence.

> So the cost of an newton iteration is mainly 1 time "Assemble cells"
plus 1 time LU Solver.

Yes, but no necessarily LU. You can choose another solver.

--
Anders


> > To: michel.dupront@xxxxxxxxxx
> > From: question149875@xxxxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Dolfin] [Question #149875]: assembly and resolution time
> > Date: Mon, 21 Mar 2011 15:03:16 +0000
> >
> > Your question #149875 on DOLFIN changed:
> > https://answers.launchpad.net/dolfin/+question/149875
> >
> > Status: Open => Answered
> >
> > Johan Hake proposed the following answer:
> > On Monday March 21 2011 07:45:30 Dupront wrote:
> > > Question #149875 on DOLFIN changed:
> > > https://answers.launchpad.net/dolfin/+question/149875
> > >
> > > Status: Answered => Open
> > >
> > > Dupront is still having a problem:
> > > > > I am running the Hyperelastic demo and I would like
> > > > > to know the assembly and resolution times.
> > > > > Could somebody help me with this matter ?
> > > >
> > > > What do you mean? Do you need timings for the different steps?
> > > >
> > > > You can call the command summary() at the end of your program to get
> > > > some information.
> > >
> > > Thank you very much for your promt answer.
> > >
> > > Yes I meant timing for the different steps including assembly and
> > > resolution.
> > >
> > > Using the command summary() I get what follows.
> > > Is there a documentation that explain the meaning of Reps.
> > > Regarding newton I understand that Reps=5 means 5
> > > newton iterations.
> > > But I don't understand what Reps=11 means for Assemble
> > > cells.
> >
> > This is the number of times integrals over cells have been assembled.
> >
> > > Is the matrix updated at each newton iteration ?
> >
> > Yes.
> >
> > Johan
> >
> > >
> > > Summary of timings | Average time Total time Reps
> > > -------------------------------------------------------------
> > > Assemble cells | 0.052189 0.57408 11
> > > Assemble exterior facets | 0.0026364 0.015818 6
> > > Build sparsity | 0.0035736 0.025015 7
> > > Delete sparsity | 8.7476e-07 6.1233e-06 7
> > > Init dofmap | 0.0020095 0.0040191 2
> > > Init tensor | 7.0271e-05 0.0004919 7
> > > LU solver | 0.34523 1.7262 5
> > > compute connectivity 0 - 3 | 0.001205 0.001205 1
> > > compute connectivity 2 - 3 | 0.00095892 0.00095892 1
> > > compute connectivity 3 - 3 | 0.030152 0.030152 1
> > > compute entities dim = 2 | 0.099474 0.099474 1
> > >
> > > > To: michel.dupront@xxxxxxxxxx
> > > > From: question149875@xxxxxxxxxxxxxxxxxxxxx
> > > > Subject: Re: [Dolfin] [Question #149875]: assembly and resolution time
> > > > Date: Mon, 21 Mar 2011 09:15:38 +0000
> > > >
> > > > Your question #149875 on DOLFIN changed:
> > > > https://answers.launchpad.net/dolfin/+question/149875
> > > >
> > > > Status: Open => Answered
> > > >
> > > > Anders Logg proposed the following answer:
> > > >
> > > > On Mon, Mar 21, 2011 at 08:58:56AM -0000, Dupront wrote:
> > > > > New question #149875 on DOLFIN:
> > > > > https://answers.launchpad.net/dolfin/+question/149875
> > > > >
> > > > > Hello,
> > > > >
> > > > > I am a new fenics user.
> > > > > It is really amazing !
> > > >
> > > > Thanks.
> > > >
> > > > > I am running the Hyperelastic demo and I would like
> > > > > to know the assembly and resolution times.
> > > > > Could somebody help me with this matter ?
> > > >
> > > > What do you mean? Do you need timings for the different steps?
> > > >
> > > > You can call the command summary() at the end of your program to get
> > > > some information.
> > > >
> > >
> > > You received this question notification because you are a member of
> > > DOLFIN Team, which is an answer contact for DOLFIN.
> > >
> > > _______________________________________________
> > > Mailing list: https://launchpad.net/~dolfin
> > > Post to : dolfin@xxxxxxxxxxxxxxxxxxx
> > > Unsubscribe : https://launchpad.net/~dolfin
> > > More help : https://help.launchpad.net/ListHelp
> >
>
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