UNRESTRICTED / ILLIMITÉE Hi:
The CUDA details are: nvcc: NVIDIA (R) Cuda compiler driver Copyright (c) 2005-2015 NVIDIA Corporation Built on Mon_Feb_16_22:59:02_CST_2015 Cuda compilation tools, release 7.0, V7.0.27 and the OS details are Linux version 2.6.32-573.1.1.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-16) (GCC) ) Regards, Rajeev Das. From: Steven Dalton [mailto:[email protected]] Sent: March-23-16 9:59 AM To: Das, Rajeev Cc: For users of the development version of PETSc; [email protected] Subject: [External] Re: [petsc-dev] Issue with sacusp preconditioner. Hello, What version of CUDA is installed? OS? Can you send your example file? Thanks, Steve On Wed, Mar 23, 2016 at 9:39 AM, Das, Rajeev <[email protected]> wrote: UNRESTRICTED / ILLIMITÉE Hi: The scenario that I considered involves a structured grid of size 32 x 32 x 32 (using Pflotran here). When I used the bcgs solver and the preconditioner jacobi, there were no issues, but when the preconditioner sacusp was used I received the following error: terminate called after throwing an instance of 'thrust::system::system_error' what(): function_attributes(): after cudaFuncGetAttributes: an illegal memory access was encountered. I am attaching the screen shots of my debugger (idb) that will provide some detail regarding the source of this error. My Petsc configuration is --download-mpich=yes --with-cc=gcc --with-cxx=g++ --with-fc=gfortran --with-shared-libraries=0 --with-debugging=1 --with-valgrind=1 --download-parmetis=yes --download-metis=yes --download-hypre=yes --download-fblaslapack=yes --with-c2html=0 --with-cuda=1 --with-cusp=1 --with-thrust=1 --with-64-bit-indices=1 I have to use 64 bit indices, if I avoid it, I receive out of memory issues. Machines used are Intel Xeon E5-2620 and Tesla K20c card having the compute capability of 3.5. When I reduced the grid size to 16 x 16 x 16 I no more receive the above error with sacusp. Can you point me what could be the problem here. Regards, Rajeev Das.
