This is a nice pattern and there are surprisingly many problems that can be solved that way. AFAIK you do not have to join() here as the processes die after the

This is a nice pattern and there are surprisingly many problems that can be solved that way. AFAIK you do not have to join() here as the processes die after the map call. Often the challenge is a big amount of (hopefully read-only) data that you want to access in every 'your_func'. The naive solution is to copy the data, but this might blow your memory.