os.environ['CUDA_LAUNCH_BLOCKING'] = '1'
时间: 2023-10-12 10:05:42 浏览: 132
This line of code sets the environment variable `CUDA_LAUNCH_BLOCKING` to `'1'`.
In CUDA programming, launching a kernel is an asynchronous operation. This means that the CPU can continue with other tasks while the GPU is processing the kernel. However, sometimes we want to ensure that the kernel has finished executing before moving on to the next task.
Setting `CUDA_LAUNCH_BLOCKING` to `'1'` forces the CPU to wait for the kernel to finish before continuing with other tasks. This can be useful for debugging, as it allows us to see the exact point at which the kernel finishes executing. However, it can also slow down performance, as the CPU has to wait for the GPU to finish processing before moving on to other tasks.