[deal.II] Re: Eigenproblem and creating a preconditioner out of a linear operator, Eigensolver Selection

[Daniel Garcia-Sanchez]

Hi Andreas,

On Thursday, July 4, 2019 at 7:41:31 PM UTC+2, Andreas Hegendörfer wrote:
>
>  Hello,
>
> 2. Are there better ways to solve this Eigenproblem, maybe with another 
> solver?
>
>
Have you tried an spectral transformation? I'm not familiar with Arpack, I 
use SLEPc. I think that you could use the 
function ArpackSolver::set_shift(). sigma is your guess for the eigenvalue.

Note that if you use an spectral transformation, you can not use an 
iterative solver. You have to use a direct solver, but it considerably 
accelerates the eigenvalue calculation.

If your eigenvalue is from the interior of the spectrum and you don't do an 
spectral transformation, it can take very long.

Best,
Daniel

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Re: [deal.II] Output subset of cells

[Daniel Arndt]

Alexander,

have a look at
https://www.dealii.org/developer/doxygen/deal.II/classDataOut.html#afdefbb966f2053f4c4fc52293d2339ce
.
You just need to overload DataOut::next_cell().

Best,
Daniel

Am Fr., 5. Juli 2019 um 10:34 Uhr schrieb Alexander :

> I am starting to hit a space/memory boundary since my VTU output becomes >
> 100 GB. Partial mitigation to this would be to output (DataOut) only some
> cells in VTU, which are of interest. In my applications, I can easily
> ignore at least half of cells.
>
> Is there a possibility to do that within the existing interface?
>
> Best
> Alexander
>
>
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[deal.II] Output subset of cells

[Alexander]

I am starting to hit a space/memory boundary since my VTU output becomes > 
100 GB. Partial mitigation to this would be to output (DataOut) only some 
cells in VTU, which are of interest. In my applications, I can easily 
ignore at least half of cells. 

Is there a possibility to do that within the existing interface?

Best
Alexander


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[deal.II] Re: 20 tests failed after make install

[Bruno Turcksin]

Zhenbang Wei,

Is it possible that Trilinos was compiled without MPI support? The two 
error you see come from Trilinos functions that uses MPI.

Best,

Bruno

On Thursday, July 4, 2019 at 10:15:51 AM UTC-4, Zb W wrote:
>
> Hello,
> I want to install deal.ii (9.1.1) in the ubuntu 18.04 on Windows 10 WSL.
> I installed the software needed and there are no mistake reports during 
> cmake and make install.
> The install process is shown in the txt file: Install Process.txt
>
> When make test, all tests are failed,(details please see quicktests.log)
> ../../lib/libdeal_II.g.so.9.1.1: error: undefined reference to 
> 'Teuchos::details::safeCommFree(int*)'
> ../../lib/libdeal_II.g.so.9.1.1: error: undefined reference to 
> 'Epetra_MpiComm::Epetra_MpiComm(int)'
> collect2: error: ld returned 1 exit status
>
> Can someone help me to solve this problem?
>
> Thanks.
> Zhenbang Wei
>
>
>

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[deal.II] Re: Problem installing DEALII 9.0.0 in CentOS cluster

[Bruno Turcksin]

Hi, 

Can you post the errors that you see on your screen.

Best,

Bruno

On Thursday, July 4, 2019 at 3:26:18 AM UTC-4, m boron wrote:
>
> Dear all,
> I have installed dealii9.0.0 in my PC and it is working fine. But now, I 
> want to install it in a cluster with CentOS. 
> I have installed 
> gcc 5.2.0
> cmake version 3.13.20181226
> openmpi-1.8.5
> PetSc 3.6.1
> SlePC3.6.3 
> P4est 2.0 in the cluster.
> These external libraries are detected and successfully configured. But at 
> the end of the config, it throws some error. I have attached the CMAKE log 
> files. I am not able to find the error. Kindly help me if anyone can figure 
> out to fix the issue. Thanking you in anticipation.
>
> With Regards,
> Boron
>

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