Re: SMP scalability: 8 -> 32 CPUs

Stephen C. Tweedie (
Wed, 2 Dec 1998 15:21:09 GMT


On Wed, 2 Dec 1998 02:09:32 +0200 (GMT+0200), Liran Zvibel
<> said:

> If I'm not mistaken, on my last trip to SGI, they told me that they
> could put up to 2048 processors in their machines.

SGI are not doing SMP, though. They divide the system into up to 64
partitions or regions, and run a separate instance of the kernel on each
one. The death of one partition does not kill the entire system.

The fact that they have hardware support for shared memory allows it to
look somewhat like SMP to the user, and their kernel has very very nice
support for single system image behaviour, but it is still closer to a
tightly-bound cluster than to an SMP system.


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