Jie Liu <jie.l...@tu-dresden.de> writes: > Hallo, > > I have a Pycuda code, which deals with two kernels. Both kernels run well > separately, but when I put them together, there is a memory problem > "LogicError: cuMemcpyDtoH failed: an illegal memory access was encountered". > In the second kernel "DotKernel", I can't change the values of any shared > array or global array. Could you please have a look at the code? Thank you > very much!
If you look at your kernel log (dmesg), do you see lines starting with "NVRM: Xid" (or so)? If so, that indicates one of your kernels encounters a segfault (that you're being told about at the next dependent operation---in your case maybe the memory transfer---in the same stream). CUDA-Memcheck might be of help in debugging this. Andreas
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