Dear Bruno,
I've been using the default one, Amesos_KLU, and I checked
Amesos_Superludist but trilinos doesn't recognize it.
when we installed dealii and its dependencies on the cluster, I think we
didn't uncomment the "#PACKAGES="${PACKAGES} once:superlu_dist" in
candi.cfg so it seems we need to install them again.
I want to solve my problem with more than one million DOFs, So you mean
Amesos_Superludist will work for that many DOFs when running on cluster ?
Thanks
On Thursday, October 27, 2016 at 5:37:31 PM UTC-5, Bruno Turcksin wrote:
>
> Hamed,
>
> On Thursday, October 27, 2016 at 5:40:04 PM UTC-4, Hamed Babaei wrote:
>
>> First: I have parallelized a code in which I use
>> TrilinosWrappers::SolverDirect
>> . The problem is that with around 20000 DOFs the code is run on my own
>> machine and on the cluster as well but when I increase DOF even to 150000
>> it get stuck at the first call to direct solver without giving any error
>> and Direct solver never got done.
>>
> 150000 is a lot of unknowns for a direct solver. 100000 unknowns is around
> the time when you need to switch to an iterative method to get the results
> quickly enough. Which solver are you using? If you are using Amesos_KLU,
> the solver is serial so using more processors is pointless. You need to use
> Amesos_Superludist.
>
>
>> Second: I don't know what solver control do for SolverDirect !!
>> SolverDirect
>> <https://www.dealii.org/8.4.1/doxygen/deal.II/classTrilinosWrappers_1_1SolverDirect.html#a5d216dac60a7bdf696c206d926974d1f>
>> (SolverControl
>> <https://www.dealii.org/8.4.1/doxygen/deal.II/classSolverControl.html> &cn,
>> const AdditionalData
>> <https://www.dealii.org/8.4.1/doxygen/deal.II/structTrilinosWrappers_1_1SolverDirect_1_1AdditionalData.html>
>> &data=AdditionalData
>> <https://www.dealii.org/8.4.1/doxygen/deal.II/structTrilinosWrappers_1_1SolverDirect_1_1AdditionalData.html>
>> ())
>> I thought SolverControl has meaning when we have iterative solvers.
>>
> You are right. It is use internally to check that the direct solver was
> able to find the solution but the parameters that you put in SolverControl
> are not used.
>
>>
>> I was wondering why the code doesn't work with increased DOF and if I can
>> do something to find out where the problem is and how to solve it.
>>
> It probably works but you may need to wait a long time for the direct
> solver to solve the system.
>
> Best,
>
> Bruno
>
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