-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sat, May 14, 2016 at 12:31:28PM -0500, Richard Owlett wrote: > I date from era when when "memory banks" were switched via contents > of a I/O port ;/ > Anyone remember era when 8085 was "state of the art" ;/ > > I envision > core A using memory range X > core B using memory range Z
What you are describing is called "non uniform memory access" aka NUMA [1] these days and yes, the Linux kernel takes into account that different parts of memory have different "distances" to each processor (e.g. by assigning process "affinities" to each CPU. To a lesser extent, CPU caches do this too. This is'nt surprising, since CPU bandwidth has outrun memory bandwith significantly across the last 20-30 years. If a CPU had to wait for every byte to arrive from main memory, they'd be slower by a huge amount [2]. So in some way the answer is; yes, your PC and your OS is probably doing it already :-) regards [1] https://en.wikipedia.org/wiki/Non-Uniform_Memory_Access [2] http://gameprogrammingpatterns.com/data-locality.html - -- t -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlc3j6QACgkQBcgs9XrR2kYjngCZAe7J7DfWSa87aRlA1vmhNCN+ Nq4An1WjmIBDCmJvahR2j5ITl1965uLu =/ElI -----END PGP SIGNATURE-----
