Hi Dominic,
> With the current implementation the following can happen (v is of type
VECCUSP):
- Originally data on GPU, v.valid_GPU_array == PETSC_CUSP_GPU
- a call to VecPlaceArray(v, arr) unplaces the data on the host and sets
v.valid_CPU_array=CPU. Note that the GPU data does not get stashed
On 08/08/2015 12:13 PM, Barry Smith wrote:
Understood. I found this in the manual page for BJACOBI :-)
Developer Notes: This preconditioner does not currently work with CUDA/CUSP
for a couple of reasons.
(1) It creates seq vectors as work vectors that should be cusp
(
Understood. I found this in the manual page for BJACOBI :-)
Developer Notes: This preconditioner does not currently work with CUDA/CUSP
for a couple of reasons.
(1) It creates seq vectors as work vectors that should be cusp
(2) The use of VecPlaceArray() is not handled proper
With the current implementation the following can happen (v is of type
VECCUSP):
- Originally data on GPU, v.valid_GPU_array == PETSC_CUSP_GPU
- a call to VecPlaceArray(v, arr) unplaces the data on the host and sets
v.valid_CPU_array=CPU. Note that the GPU data does not get stashed.
- subsequent
> On Aug 7, 2015, at 7:50 PM, Dominic Meiser wrote:
>
> FYI I've opened a pull request that addresses this issue.
>
> While going through the code I ran into a question regarding the semantics of
> VecPlaceArray and VecResetArray: Is the contents of the "unplaced" array
> supposed to be prese
FYI I've opened a pull request that addresses this issue.
While going through the code I ran into a question regarding the
semantics of VecPlaceArray and VecResetArray: Is the contents of the
"unplaced" array supposed to be preserved so that the vector is
completely restored upon calling VecRe
Thanks for pointing this out. I'll have a look.
Dominic
On 08/07/2015 02:42 PM, Barry Smith wrote:
Guardians of CUDA/GPUs
http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2015/08/06/examples_master_arch-cuda-double_bb-proxy.log
http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2015/0
Guardians of CUDA/GPUs
http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2015/08/06/examples_master_arch-cuda-double_bb-proxy.log
http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2015/08/06/examples_master_arch-cuda_bb-proxy.log
search for ex2_bjacobi
note that this example does not fa
