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

[behzad baghapour]

OK. Does any of them consider a sparse function differentiation or one
should define a dense matrix to recieve the result? If so, then is there
any possiblity to face with  memory allocation problem in Large scale
simulations?



On Mon, Aug 20, 2012 at 8:55 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> 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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