[oivey]

The whole reason CUDA/GPUs are fast is that they explicitly don’t match the architecture of CPUs. The truly sophomoric attitude is that all compute devices should work like CPUs. The point of CUDA/GPUs is to provide a different set of abstractions than CPUs that enable much higher performance for certain problems. Forcing your GPU to execute CPU-like code is a bad abstraction.

Your comment about putting fopen in an inner loop really betrays that. Every thread in your GPU kernel is going to have to wait for your libc call. You’re really confused if you’re talking about hot loops in a GPU kernel.