[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>

> I do set preallocation after setting the matrix type.
>

Run with -info to make sure it is used (i.e. that the matrix type isn't
changed later). Note that PCSOR does not run on the GPU, so it will do lots
of copying (run with -log_summary to see). You should start by running
PCJACOBI on the GPU.


>
> Zeng
>
> 在 2012-03-13 22:14:12，"Jed Brown" <jedbrown at mcs.anl.gov> 写道：
>
> 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?
>
>
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