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

[Paul Mullowney]

I don't think PCJACOBI is working on the GPU yet.

I have some local fixes to make it work efficiently (without extra 
copies), but changes won't be pushed too soon because the design is not 
sufficiently general.

-Paul
> 2012/3/13 Xiangze Zeng <zengshixiangze at 163.com 
> <mailto: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
>     <mailto:jedbrown at mcs.anl.gov>> 写道：
>
>         2012/3/13 Xiangze Zeng <zengshixiangze at 163.com
>         <mailto: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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