Ehsan,
All I can say: After switching the order of arguments in SparseMatrix::add,
your code runs for me with a recent developer version and Trilinos at least.
Best,
Daniel
Am Montag, 4. Juli 2016 18:59:05 UTC+2 schrieb Ehsan Esfahani:
>
> Dear Professor Bangerth,
>
> Thanks for your response. Yes, I did. As I mentioned, I got a backtrace in
> the debugger (eclipse) and I find out that the problem is in the line I
> have mentioned but I couldn't find out what's the problem in that line of
> the code which causes segmentation violation.
>
> Best,
> Ehsan
>
>
> On Sunday, July 3, 2016 at 4:32:16 PM UTC-5, bangerth wrote:
>>
>> On 07/03/2016 03:50 PM, Ehsan Esfahani wrote:
>> > Dear All,
>> >
>> > Greetings. I changed step-25 (minor changes) in order to solve my
>> problem. Now
>> > I want to change this code for parallel computation based on the method
>> > mentioned in step-40. I got several errors and solved them one by one
>> but the
>> > following error:
>> >
>> > /Number of active cells: 1024
>> > // Total number of cells: 1365
>> > //{[0,4224]}//
>> > //Time step #1; advancing to t = 0.1.
>> > [...]
>> > //[0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation
>> Violation,
>> > probably memory access out of range
>> > [...]
>> >
>> > /
>> > /
>> > Eclipse gives me a backtrace in the following line of the code:
>> > / solver.solve (system_matrix,
>> completely_distributed_solution_update,
>> > system_rhs,/
>> > / preconditioner);/
>> > I have no idea why I got this error. The code is running properly for
>> /fe(1)
>> > /and /n_global_refinements (4)/ but when I change them to /fe(2)/ and
>> > n_global_refinments (4) I got that error related to /Segmentation
>> Violation.
>> > /Do you know what's going on? Also, I have attached the code here .
>> Thanks in
>> > advance for your help.
>>
>> Ehsan,
>>
>> segmentation violations (SEGV) are typically easy to debug because you
>> can get
>> a backtrave in the debugger of the exact place where it happens, and you
>> can
>> then look at the local variables to see why this may have happened. Have
>> you
>> tried to run the program in a debugger and see what is going on?
>>
>> Best
>> W.
>>
>> --
>> ------------------------------------------------------------------------
>> Wolfgang Bangerth email: bang...@math.tamu.edu
>> www: http://www.math.tamu.edu/~bangerth/
>>
>>
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