[petsc-users] How to use AD for unstructured grid

[behzad baghapour]

Dear Jed,

Which AD tool you suggest in the case of fast evaluations? Operator
Overlapping types like ADOL-C or source code transformation types like ADIC?

In addition, I prefer the minimum possible change to the my code structure
:-)

Thanks a lot,
BehZad

On Sun, Aug 19, 2012 at 10:06 PM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> OK. Thanks. I should try it.
>
>
> On Sun, Aug 19, 2012 at 9:56 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
>> On Sun, Aug 19, 2012 at 1:19 PM, behzad baghapour <
>> behzad.baghapour at gmail.com> wrote:
>>
>>> Dear developers,
>>>
>>> I need to evaluate Jacobian matrix using an AD tool. I read from the
>>> Petsc manual that it can only work with structured grid via DMMG interface.
>>> Is there a possible way to use it for unstructured grid and set it for KSP
>>> structure?
>>>
>>
>> ADIC has not been supported for a long time so the "automatic" AD support
>> in PETSc is no longer supported either. Unfortunately, the successors to
>> ADIC, while more "capable", are much more involved to build and to use.
>>
>> You have always been able to use any AD tool internally to define the
>> Jacobian (in assembled or unassembled form).
>>
>
>
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