Summit node CPUs can access GPU memory coherently and unified memory allows for a single pointer across all processors. On most systems that involves page fault

Summit node CPUs can access GPU memory coherently and unified memory allows for a single pointer across all processors. On most systems that involves page faults migrating pages, but summit has something called ATS that allows GPU to directly access all system memory. https://vimeo.com/262870773/recommended https://vimeo.com/262870773/recommended