![]() ![]() binary permutation “4” of a sequence swaps 4-element halves of each set of 8 element, e.g.,.binary permutation “3” of a sequence performs both permutation “1” and permutation “2”.binary permutation “2” of a sequence swaps pairs of elements in each set of four, e.g.,.binary permutation “1” of a sequence swaps elements in each even/odd pair, e.g.binary permutation “0” of a sequence is just the original sequence.The “binary permutation” operator can be described in several different ways, but the structure is simple: The observed sequences are the “binary permutations” of the sequence. The total number of possible permutations of the 元 slice numbers is 16! (almost 21 trillion), but measurements on the hardware show that only 16 unique permutations are actually used. ![]() The 元 cache is divided into “slices”, which are distributed around the chip - typically one “slice” for each processor core.Įach core’s L1 and L2 caches are local and private, but outside the L2 cache addresses are distributed in a random-looking way across the 元 slices all over the chip.Īs an easy case, for the Xeon Gold 6142 processor (1st generation Xeon Scalable Processor with 16 cores and 16 元 slices), every aligned group of 16 cache line addresses is mapped so that one of those 16 cache lines is assigned to each of the 16 元 slices, using an undocumented permutation generator. Starting with the Xeon E5 processors “Sandy Bridge EP” in 2012, all of Intel’s mainstream multicore server processors have included a distributed 元 cache with distributed coherence processing. ![]()
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