This means that the very first error encountered by your kernel was an invalid global read of size 4 (i.e. = Host Frame:/lib64/libc.so.6 (_libc_start_main + 0xf4) = Host Frame:/usr/lib64/libcuda.so.1 (cuLaunchKernel + 0x2cd)
= Saved host backtrace up to driver entry point at kernel launch time Now we get output that looks like this: $ nvcc -arch=sm_20 -lineinfo -o t615 t615.cu
We can get additional clarity if we recompile your code adding the -lineinfo switch (or alternatively with -G), and then re-run your code with cuda-memcheck. This means that you are making an out-of-bounds memory access. cc7.0 or newer, you should use compute-sanitizer instead of cuda-memcheck, but otherwise the process here is identical.) If we run your program with cuda-memcheck, we get some additional output that indicates that the kernel is doing invalid global reads of size 4. But we don't need to pull out the debugger just yet.Ī useful tool is cuda-memcheck. You can debug kernel execution problems using a debugger, such as cuda-gdb on linux, or Nsight VSE on windows. But we can proceed forward regardless.Įither message indicates that the kernel launched but encountered an error, and so failed to complete successfully. The exact error reporting will depend on CUDA version, GPU, and platform. You may indeed be getting "unspecified launch failure" instead. When I compile and run your code, I get: an illegal memory access was encountered-3 I guess that's the error is quite simple, but can't figure to find it. But I can't find the error (s) in the kernel. Ok, so I've read that it's usually due to the kernel which doesn't run properly. Whne I check my errors, the "unspecified launch failure" appears on the memcpy AFTER the kernel. Printf("%s-%d",cudaGetErrorString(err),3) Here is the kernel and a function that fill a matrix : #include "solver.h"Įrr=cudaMemcpy(M1_h, M1_d, size, cudaMemcpyDeviceToHost) _global_ void SolverGPU(float* M1, float* M2) Here is the header, its name is "sole : #define ITER_BETWEEN_SAVES 10000 ROOM_X ans ROOM_Y are the width and height of the matrices. The program is a solver of a differential equation. While both devices are very similar, they have some essential differences that will impact your product choice for specific needs.I'm encountering an "unspecified launch failure" when running my program in Cuda. The main differences between Omron M2 vs.