> same amount of threads in half the time Sure, if you forget all the additional cache evictions, memory reads and writes and TLB flushes caused by all the co

> same amount of threads in half the time Sure, if you forget all the additional cache evictions, memory reads and writes and TLB flushes caused by all the competing threads on a single core. Not to mention that one shitty bit of code in one thread can poison the cache enough to re-read the data from memory every context switch.