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

[Xiangze Zeng]

Hi, Jed.
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?


Zeng


在 2012-03-13 20:12:09，"Jed Brown" <jedbrown at mcs.anl.gov> 写道：

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

After I  configure PETSc using --with-precision=single, I can run both ex19 and my own code. Good news! But it seems lots of time is using for copping the data from CPU to GPU. 


How are you measuring? What preconditioner are you using and how many iterations are typically required?
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