Blue Gene/Q interconnect buses
In this chapter, the various types of interconnections for the Blue Gene/Q system are described.
2.1 Interconnection from compute card to compute card
Compute-card-to-compute-card communication is performed through a 5-dimensional torus interconnect. This interconnection carries 2 gigabytes per second (GBps) of raw data, simultaneously, in both directions on all 10 links. At a 10% packet overhead, the bandwidth for the payload, in both directions on a single link, is 3.6 GBps. The latency of each hop is approximately ...

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