Question #105253 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/105253
Status: Answered => Open
Murtazo Nazarov is still having a problem:
Johan Hake wrote:
> Question #105253 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/105253
>
> Status: Open => Answered
>
> Johan Hake proposed the following answer:
> On Monday March 22 2010 20:46:22 Murtazo Nazarov wrote:
>
>> Johan Hake wrote:
>>
>>> Question #105253 on DOLFIN changed:
>>> https://answers.launchpad.net/dolfin/+question/105253
>>>
>>> Status: Open => Answered
>>>
>>> Johan Hake proposed the following answer:
>>>
>>> On Monday 22 March 2010 20:04:47 Murtazo Nazarov wrote:
>>>
>>>> New question #105253 on DOLFIN:
>>>> https://answers.launchpad.net/dolfin/+question/105253
>>>>
>>>> I am trying to use Lu factorized solver, for that did like this.
>>>>
>>>> LUSolver solver("lu");
>>>> Matrix M;
>>>> Vector b;
>>>> assemble(M, *a);
>>>> assemble(b, *L);
>>>> solver.factorize(M);
>>>> solver.factorized_solve(u.vector(), b);
>>>>
>>>> The matrix M is a mass matrix. But I get runtime error:
>>>>
>>>> terminate called after throwing an instance of 'std::runtime_error'
>>>>
>>>> what(): *** Error: Unable to return pointers to underlying matrix
>>>> data.
>>>>
>>>> Did someone experienced such output? Do you know how to fix it?
>>>>
>>> I think Garth can give a more comprehensive answer, but it looks like
>>> solver.factorize only works for the uBLAS backend. So you probably need
>>> to
>>>
>>> set:
>>> parameters["linear_algebra_backend"] = "uBLAS";
>>>
>>> in the beginning.
>>>
>>> Johan
>>>
>> With this I get another error:
>>
>> Initializing DOLFIN version 0.9.7.
>> Matrix of size 14400 x 14400 has 43200 nonzero entries.
>> Sorting sparsity pattern.
>> Matrix of size 14400 x 14400 has 43200 nonzero entries.
>> Sorting sparsity pattern.
>> LU-factorizing linear system of size 14400 x 14400 (UMFPACK).
>> [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation,
>> probably memory access out of range
>> [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
>> [0]PETSC ERROR: or see
>> http://www.mcs.anl.gov/petsc/petsc-as/documentation/troubleshooting.html#Si
>> gnal[0]PETSC ERROR: or try http://valgrind.org on linux or man libgmalloc
>> on Apple to find memory corruption errors
>> [0]PETSC ERROR: configure using --with-debugging=yes, recompile, link,
>> and run
>> [0]PETSC ERROR: to get more information on the crash.
>> [0]PETSC ERROR: --------------------- Error Message
>> ------------------------------------
>> [0]PETSC ERROR: Signal received!
>>
>
> No luck yet?
>
> I have run out of suggestions :(
>
>
No, still have the same problem. So far I use hypre to solve the linear
system for the mass matrix, it is quite fast, but I don't know if I get
speedup by factorizing.
murtazo
> Johan
>
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