Matthew Knepley writes:
>> The matrix entries are multiplied by 2, that is, the number of processes
>> used to execute the code.
>>
>
> No. This was mostly intended for GPUs, where there is 1 process. If you
> want to use multiple MPI processes, then each process can only introduce
> some
Using all recommended approaches it worked!
Thank you all in advance.
Now, I'm facing problems when solving a linear system using each approach.
*COO approach*
Using MatSetPreallocationCOO and then MatSetValuesCOO, I'm able to fill in
the matrix when running with 1 MPI process.
But, if I run
You should partition the entries so each entry is submitted by only one
process. Note that duplicate entries (on the same or different proceses) are
summed as you've seen. For example, in finite elements, it's typical to
partition the elements and each process submits entries from its elements.
So... what do I need to do, please?
Why am I getting wrong results when solving the linear system if the matrix
is filled in with MatSetPreallocationCOO and MatSetValuesCOO?
Em ter., 20 de jun. de 2023 às 14:56, Jed Brown escreveu:
> Matthew Knepley writes:
>
> >> The matrix entries are
On Tue, Jun 20, 2023 at 2:02 PM Diego Magela Lemos
wrote:
> So... what do I need to do, please?
> Why am I getting wrong results when solving the linear system if the
> matrix is filled in with MatSetPreallocationCOO and MatSetValuesCOO?
>
It appears that you have _all_ processes submit _all_
On Tue, Jun 20, 2023 at 1:43 PM Diego Magela Lemos
wrote:
> Using all recommended approaches it worked!
> Thank you all in advance.
>
> Now, I'm facing problems when solving a linear system using each approach.
>
> *COO approach*
>
I can answer this one.
> Using MatSetPreallocationCOO and
Thanks a lot, Constantine. It works pretty well.
On Fri, Jun 16, 2023 at 6:52 PM Constantine Khrulev
wrote:
> In your code the destructor of DMManage is called at the end of scope,
> i.e. after the PetscFinalize() call.
>
> You should be able to avoid this error by putting "DMManage
On Tue, Jun 20, 2023 at 10:55 AM Diego Magela Lemos via petsc-users <
petsc-users@mcs.anl.gov> wrote:
> Considering, for instance, the following COO sparse matrix format, with
> repeated indices:
>
> std::vector rows{0, 0, 1, 2, 3, 4};
> std::vector cols{0, 0, 1, 2, 3, 4};
> std::vector values{2,
Since you have 6 entries that needed to be added to the matrix you will need
to call MatSetValues() six time for the six entries.
> On Jun 20, 2023, at 11:06 AM, Matthew Knepley wrote:
>
> On Tue, Jun 20, 2023 at 10:55 AM Diego Magela Lemos via petsc-users
>
Considering, for instance, the following COO sparse matrix format, with
repeated indices:
std::vector rows{0, 0, 1, 2, 3, 4};
std::vector cols{0, 0, 1, 2, 3, 4};
std::vector values{2, -1, 2, 3, 4, 5};
that represents a 5x5 diagonal matrix A.
So far, the code that I have is:
//
Two weeks ago we held the 2023 PETSc Annual Meeting on the campus of the
Illinois Institute of Technology. The meeting was a lot of fun: we had over 30
speakers from industry, academia, and national laboratories present on their
research and experiences with PETSc, including several
The loop should iterate on the number of entries of the array, not the
number of local rows
On Tue, Jun 20, 2023, 17:07 Matthew Knepley wrote:
> On Tue, Jun 20, 2023 at 10:55 AM Diego Magela Lemos via petsc-users <
> petsc-users@mcs.anl.gov> wrote:
>
>> Considering, for instance, the following
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