The reason why Intel is using ring is that the number of cores in modern CPU has not been high enough to make the low cost unattractive. There is also optimization to reduce latency, such as connecting in two place on the ring (see Implementing Synchronization, slide 2). This connection allows each node to choose the shorter "arc" or the direction with smaller number of hops.
The reason why Intel is using ring is that the number of cores in modern CPU has not been high enough to make the low cost unattractive. There is also optimization to reduce latency, such as connecting in two place on the ring (see Implementing Synchronization, slide 2). This connection allows each node to choose the shorter "arc" or the direction with smaller number of hops.
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