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

[Xiangze Zeng]

Hi, Jed.


I do set preallocation after setting the matrix type.
 
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?


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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