Thanks, Matt.
It seems DMPlexComputeCellGeometryFEM works well with the quadrature
points to deliver Jacobian and inverse one.
Will it be a good choice ?
Have a good night.
Thanks,
On Fri, Jun 23, 2023 at 10:33 AM Matthew Knepley wrote:
> On Fri, Jun 23, 2023 at 10:28 AM neil liu wrote:
>
Dear Barry,
I have started looking at the code but I miss an example using
SNESNASMSetSubdomains. In fact I do not even find a single use of the
function in PETSc.
Could someone provide me with an example ?
Thanks,
Nicolas
Le ven. 23 juin 2023 à 02:17, Barry Smith a écrit :
>
> A test would
In order to transfer from Python to C a list of int, real or bool as an
input, there are the functions iarray_i, iarray_r and iarray_b.
In order to transfer from C to Python a list of int, real, bool or pointers
as an output, there are the functions oarray_i, oarray_r, oarray_b and
oarray_p.
Alexander, let me add that Ilu is pretty commodity, and is available with
our vendor, back ends, and that is probably the more reliable route.
Hyper’s AMG Solver is state of the art, but their ilu is not their focus.
Mark.
On Fri, Jun 23, 2023 at 12:11 AM Jed Brown wrote:
> It looks like
Dear Petsc developers,
I am learning *PetscDTSimplexQuadrature *and plan to use it.
I found that, in the biunit simplex (tetra),
(-1,-1,-1),(1,-1,-1),(-1,1,-1),(-1,-1,1),
degree 1: npoints 4, the sum of weights = 4/3(the volume of this simplex)
degree 2 : npoints 8;
For my previous experience, I
On Fri, Jun 23, 2023 at 10:28 AM neil liu wrote:
> Dear Petsc developers,
>
> I am learning *PetscDTSimplexQuadrature *and plan to use it.
> I found that, in the biunit simplex (tetra),
> (-1,-1,-1),(1,-1,-1),(-1,1,-1),(-1,-1,1),
> degree 1: npoints 4, the sum of weights = 4/3(the volume of
Thanks all for your replies. Mark, I’m a little unclear on what you said. My understanding is that PETSc ILU is serial only (or can be used as the sub PC in DD PCs).On Jun 23, 2023, at 3:35 AM, Mark Adams wrote:Alexander, let me add that Ilu is pretty commodity, and is available with our vendor,
Based on https://github.com/hypre-space/hypre/issues/937 it sounds like
hypre-ILU is under active development and should be the one we focus on
bindings for. It does support 64 bit indices and GPU
On Fri, Jun 23, 2023 at 8:36 AM Alexander Lindsay
wrote:
> Thanks all for your replies. Mark, I’m
Hi Jed, I will come back with answers to all of your questions at some
point. I mostly just deal with MOOSE users who come to me and tell me their
solve is converging slowly, asking me how to fix it. So I generally assume
they have built an appropriate mesh and problem size for the problem they
Look at SNESSetUp_NASM() src/snes/nasm/nasm.c and see the if (dm) case. It
calls DMCreateDomainDecomposition() to get subdms and then calls
DMCreateDomainDecompositionScatters() to get the scatters that would be passed
to SNESNASMSetSubdomains(). Then it builds the subsnes. These are
the
Take a look at setNestSubVecs() in
/src/binding/petsc4py/src/petsc4py/PETSc/Vec.pyx it seems to deal with passing
an array of PETSc objects. Likely there are additional instances where arrays
of objects are passed between Python and C.
I do not understand this code, but the Python
Thanks Barry, I'll check it out.
Le ven. 23 juin 2023 à 18:57, Barry Smith a écrit :
>
> Take a look at setNestSubVecs()
> in /src/binding/petsc4py/src/petsc4py/PETSc/Vec.pyx it seems to deal with
> passing an array of PETSc objects. Likely there are additional instances
> where arrays of
> On 23 Jun 2023, at 9:39 PM, Alexander Lindsay
> wrote:
>
> Ah, I see that if I use Pierre's new 'full' option for
> -mat_schur_complement_ainv_type
That was not initially done by me (though I recently tweaked
MatSchurComplementComputeExplicitOperator() a bit to use KSPMatSolve(), so that
> On 23 Jun 2023, at 10:06 PM, Pierre Jolivet wrote:
>
>
>> On 23 Jun 2023, at 9:39 PM, Alexander Lindsay
>> wrote:
>>
>> Ah, I see that if I use Pierre's new 'full' option for
>> -mat_schur_complement_ainv_type
>
> That was not initially done by me
Oops, sorry for the noise, looks like
I guess it is because the inverse of the diagonal form of A00 becomes a
poor representation of the inverse of A00? I guess naively I would have
thought that the blockdiag form of A00 is A00
On Fri, Jun 23, 2023 at 10:18 AM Alexander Lindsay
wrote:
> Hi Jed, I will come back with answers to all
Ah, I see that if I use Pierre's new 'full' option for
-mat_schur_complement_ainv_type that I get a single iteration for the Schur
complement solve with LU. That's a nice testing option
On Fri, Jun 23, 2023 at 12:02 PM Alexander Lindsay
wrote:
> I guess it is because the inverse of the diagonal
I am micromagnetic (MAGPAR) software developer. Old Magpar version has
been using petsc 3.1-p8. I have decided to upgrade to petsc 3.19.2 with
avx512 support. Unfortunately there appeared an error during software
testing. Error appeares in ranning code after proper compiling and
linking. The
Could you send us the exact error output that occurs? Cut and paste the run
command and the entire error message.
Also send the configure options you used. Have you tried configuring the
later PETSc versions with all optimization turned off; use --with-debugging=1
--with-cflags='-g -O0'
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