[petsc-users] Why does GPU solve the large sparse matrix equations only a little faster than CPU?

[Matthew Knepley]

On Fri, Aug 3, 2012 at 9:18 AM, Xiangze Zeng <zengshixiangze at 163.com> wrote:

> Dear all,
>
> When I use the CPU solve the equations, it takes 78 minutes, when I change
> to use GPU, it uses 64 minutes, only 15 minutes faster. I see some paper
> say when using PETCs with GPU to solve the large sparse matrix equations,
> it can be several times faster? What's the matter?
>

For all performance questions, we at least need the output of -log_summary.
However, we would also need to know

  - The size and sparsity of your system

  - The CPU and GPU you used (saying anything without knowing this is
impossible)

   Matt


> Thank you!
>
> Sincerely,
> Zeng Xiangze
>
>
>


-- 
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
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