3 ms·

Plan9 on an oxide rack might get you close to an SSI work-a-like - but I think it's unlikely it'd be a practical use of the hw?

• zozbot234 5y ago
  AIUI, Plan9 is not quite fully SSI. It is a distributed OS, and gets quite close, but it's missing support for distributed memory (i.e. software-implemented shared memory exposing a single global address space); it also does not do process checkpointing and auto-migration, without which you don't really have a "global" system image.
  • rbanffy 5y ago
    Mosix and VirtualIron worked at a time 1GBps ethernet was in its infancy. Today 10GBps are consumer grade and 40GBps can go over Cat 8 copper, roughly equivalent to a DDR4-4000 channel. Not great, but this is near COTS hardware. They can do significantly better than that.
    • wmf 5y ago
      Uh no, DDR4-4000 (which servers can't use BTW) is ~256 Gigabits per second. Latency is also a killer; optimized Infiniband is ~1 us which is 10x slower than local RAM at ~100 ns.
      • rbanffy 5y ago
        Sorry. I wrote GBps when I should Gbps and I got myself fooled in the process. We can somewhat mitigate the latencies with good caches. The overall machine will suffer from a bad case of NUMA ,but would still behave better than a cluster.