CUDA Error: Illegal Memory Access in MATLAB Code

Hi everyone,
I’m encountering a CUDA error in my MATLAB code during the second iteration of a loop. Specifically, the error occurs at the wait(gd); command after calling setConstantMemory(kPAM, ‘g_nT_Start’, single((i) * Max_T_dim));. The error message is:
Error using parallel.gpu.CUDADevice/wait
Encountered unexpected error during CUDA execution. The CUDA error was:
an illegal memory access was encountered

Here is the relevant part of my code:
kPAM = parallel.gpu.CUDAKernel(‘PAM.ptx’, ‘PAM.cu’, ‘_PAM’);
kPAM.ThreadBlockSize = [1024,1,1];
kPAM.GridSize = [ceil(struct_GPU.Pix.nTdim/kPAM.ThreadBlockSize(1)),struct_GPU.Pix.nYdim*struct_GPU.Pix.nXdim, struct_GPU.Pix.nZdim];
setConstantMemory(kPAM,’g_nT_Start’,single(0));
for i = 1:Lteration
if i == Lteration % Last iteration
last_T_dim = struct_GPU.Pix.nTdim – (Max_T_dim * i);
last_input_Array = gpuArray(single(zeros(last_T_dim, struct_GPU.Pix.nZdim, …
struct_GPU.Pix.nXdim * struct_GPU.Pix.nYdim)));
assignin(‘base’, ‘PAM_txyz_gpu’, last_input_Array);
assignin(‘base’, ‘PAM_txyz_cpu’, last_input_Array);
elseif i > 1
PAM_txyz_gpu = input_Array;
PAM_txyz_cpu = output_Array;
else
PAM_txyz_gpu = input_Array;
PAM_txyz_cpu = output_Array;
end

[PAM_txyz_gpu] = feval(kPAM, PAM_txyz_gpu, RFData_gpu);
setConstantMemory(kPAM, ‘g_nT_Start’, single((i) * Max_T_dim));
wait(gd);
PAM_txyz_cpu = gather(PAM_txyz_gpu);
wait(gd);
PAM_xyz_cpu = PAM_xyz_cpu + squeeze(sum(PAM_txyz_cpu, 1));
end

clear PAM_txyz_cpu PAM_txyz_gpu last_input_Array input_Array;
reset(gd);

Does anyone have any suggestions on how to resolve this illegal memory access issue?
Thanks in advance!Hi everyone,
I’m encountering a CUDA error in my MATLAB code during the second iteration of a loop. Specifically, the error occurs at the wait(gd); command after calling setConstantMemory(kPAM, ‘g_nT_Start’, single((i) * Max_T_dim));. The error message is:
Error using parallel.gpu.CUDADevice/wait
Encountered unexpected error during CUDA execution. The CUDA error was:
an illegal memory access was encountered

clear PAM_txyz_cpu PAM_txyz_gpu last_input_Array input_Array;
reset(gd);

Does anyone have any suggestions on how to resolve this illegal memory access issue?
Thanks in advance! Hi everyone,
I’m encountering a CUDA error in my MATLAB code during the second iteration of a loop. Specifically, the error occurs at the wait(gd); command after calling setConstantMemory(kPAM, ‘g_nT_Start’, single((i) * Max_T_dim));. The error message is:
Error using parallel.gpu.CUDADevice/wait
Encountered unexpected error during CUDA execution. The CUDA error was:
an illegal memory access was encountered

clear PAM_txyz_cpu PAM_txyz_gpu last_input_Array input_Array;
reset(gd);

Does anyone have any suggestions on how to resolve this illegal memory access issue?
Thanks in advance! gpu, cuda, ptx MATLAB Answers — New Questions

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