CUDA error message : unspecified launch failure

Question

This is part of my CUDA code. But last part of this code says some error message.

unsigned int *mat_count;
off_t *mat_position;
unsigned int *matches_count;
off_         


        

Answer 1

Compile your application with debug flags nvcc -G -g and try running your application inside cuda-memcheck or cuda-gdb. It might give you a hint where the problem might lie.

Just run

cuda-memcheck ./yourApp

Answer 2

An unspecified launch failure is almost always a segfault. You've got an indexing mistake somewhere in your kernel, probably while accessing global memory.

I'd look through your code, but it's mildly incomprehensible...