[petsc-users] Matrix version of VecScatterCreateToAll

[김성익]

For example, before using preallocaotor, I made A matrix. (A matrix has
information about indices of global matrix)
And the code structures are as below.
for (int i=0; i<num; i++){
   MatGetRow(A,~~) // for getting indices info of global matrix.
   MatSetvalues(preallocator, value_from_A);
}
Current state, I got an error at 'MatGetRow' when I run this code in
parallel.
That's why I want "all mpi ranks has information of A matrix".

Thanks,
Hyung Kim


2022년 12월 18일 (일) 오후 11:36, Junchao Zhang <junchao.zhang at gmail.com>님이 작성:

> I am not clear on what you said "this information must be viewed in all
> mpi ranks."  Even with preallocator, each rank only needs to insert entries
> it knows (i.e., don't need to get all entries)
>
> Maybe you could provide an example code for us to better understand what
> you mean?
>
> --Junchao Zhang
>
>
> On Sun, Dec 18, 2022 at 8:25 AM 김성익 <ksi2443 at gmail.com> wrote:
>
>> Hello,
>>
>>
>> Is there a matrix version function of VecScatterCreateToAll?
>>
>> I'm using preallocator for preallocation of global matrix.
>> Prior to using the preallocator, information related to allocation is
>> stored in the specific matrix, and this information must be viewed in all
>> mpi ranks.
>> For using preallocator, I need scattering the specific matrix info to all
>> mpi ranks.
>>
>> Thanks,
>> Hyung Kim
>>
>
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