To nitpick in addition to the already existing comments: this has nothing to do with GPUs per se. You would see the same issue in multithreaded code on a CPU. E

To nitpick in addition to the already existing comments: this has nothing to do with GPUs per se. You would see the same issue in multithreaded code on a CPU. Even on a single core CPU this can happen with a multithreaded program depending on how the OS schedules and interrupts the threads. It just happens to be an implementation choice in a GPU library/API.