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

[Jed Brown]

This is a choice for you to make. Operator overloading is usually less
intrusive to use, but also more limited in capability.

On Mon, Aug 20, 2012 at 12:24 AM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> 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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