Posted Mar 17, 2012 8:40 UTC (Sat) by khim
In reply to: memory mirroring?
Parent article: Toward better NUMA scheduling
I think you may be mistaking how much of a win this is. There is an improvement in the speed of accessing memory, and even if we say that it's a 2x improvement, it still may not make much practical difference.
Note that 2x improvement limit is recent improvement (when you have 8-16 cores in a single CPU you can build quite capable NUMA system with very few CPUs). It's not uncommon for older NUMA systems to have 10x or even 100x difference between access to local memory and remote memory. Not sure if anyone still builds such systems (SGI used to, but it's dead now).
to post comments)