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

[Xiangze Zeng]

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?
Thank you!


Sincerely,
Zeng Xiangze
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