Daniel,
thanks for your response. the problem is in preconditioner. I find out that
my code is running on my friend's machine but I get the error related to
SEGV. I have changed preconditioner to Jacobi and it's running but with
more iterations than AMG. Also, it's not running on my computer and the
problem on my computer remained the same as before :-(
Best,
Ehsan
On Monday, July 4, 2016 at 5:00:51 PM UTC-5, Daniel Arndt wrote:
>
> 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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