A POWER8 FOR EVERYONE【平民的POWER8】
Inside the Beast(s)【猛兽之心】
The Xeon and IBM POWER8 have totally different memory subsystems. The IBM POWER8 connects to 4 “Centaur” buffer cache chips, which have each a 19.2 GB/s read and 9.6 GB/s write link to the processor, or 28.8 GB/s in total. This is a more efficient connection than the Xeon which has a simpler half-duplex connection to the RAM: it can either write with 76.8 GB/s to the 4 channels or read from the 4 channels. Considering that reads happen twice as much as writes, the IBM architecture is – in theory – better balanced and has more aggregated bandwidth.
IBM S812LC (2U)
Intel’s Xeon E5 Server ? S2600WT (2U Chassis)
Hyperthreading, Turbo, C1 and C6 were enabled in the BIOS.
First we look at how well SMT-2, SMT-4 and SMT-8 work on the IBM POWER8.