[petsc-users] matsetvalueslocal for aijcusparse matrix

[Matthew Knepley]

On Mon, Oct 21, 2019 at 7:27 PM Xiangdong via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello everyone,
>
> When I use matsetvalueslocal to form the matrix in aijcusparse format, I
> found that it takes forever to finish the loops of matsetvalueslocal. I am
> setting one entry a time, and there are about about 28 Million nonzeros.
> (It is fast if the matrix is aij, instead of aijcusparse).
>
> However, if I have the matrix ready in binary format and use matload to
> get it into aijcusparse format, it is fast.
>
> Is it the issue of matsetvalueslocal or my wrong way of using
> matsetvalueslocal? any suggestions to speed up the process?
>

Is the matrix preallocated properly? You should be able to check with -info.

  Thanks,

     Matt


> Thank you.
>
> Xiangdong
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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