Power9和Power8对于Power7上存在的内存亲和性问题有很大的提升。因为在Power8和Power9的体系架构上增加了CPU之间的SMP连线,特别是跨机柜的链接。在Power7中最差的内存访问要经过3跳,而在Power8和Power9里面最差只需要经过2跳。而且,Power9除了提供至少1条2跳的线路外还可以提供若干条3跳的旁路增加内存访问的带宽。
收起POWER9 processor highlights
Here are some highlights of the POWER9 processor:
Four processor offerings available (SMT8 cores) and offered through both GAs:
– 12-core or 11-core processor (maximum throughput)
– 10-core processor
– 8-core processor (maximum core performance)
Processor frequencies dynamic for maximum performance
CoD support
Increased processor to processor fabric interconnect:
– 16 Gbps X-Bus Fully connected fabric within a central electronics complex drawer
– 4x increase in O-Bus fabric for Drawer to Drawer interconnect or Accelerator