[petsc-users] [petsc-maint #107932] run a simple example ex19 in src/snes/examples/tutorials

[Jed Brown]

2012/3/13 Xiangze Zeng <zengshixiangze at 163.com>

> At the beginning and end of  the codes for setting the matrices values, I
> add "printf", and compute the time of this period. It is much longer than
> that when I don't use the GPU. I just guess the time is used for copping
> data. My PCTYPE is sor. And 2000 iterations.  Do you have any suggestion
> about this?


I suspect you have lost preallocation information when the matrix type was
changed. Make sure you set preallocation after setting the matrix type.
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