Messages in this thread | | | Date | Wed, 19 Jun 2002 10:27:15 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: latest linus-2.5 BK broken |
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On 19 Jun 2002, Eric W. Biederman wrote: > > 10-20 years or someone finds a good way to implement a single system > image on linux clusters. They are already into the 1000s of nodes, > and dual processors per node category. And as things continue they > might even grow bigger.
Oh, clusters are a separate issue. I'm absolutely 100% conviced that you don't want to have a "single kernel" for a cluster, you want to run independent kernels with good communication infrastructure between them (ie global filesystem, and try to make the networking look uniform).
Trying to have a single kernel for thousands of nodes is just crazy. Even if the system were ccNuma and _could_ do it in theory.
The NuMA work can probably take single-kernel to maybe 64+ nodes, before people just start turning stark raving mad. There's no way you'll have single-kernel for thousands of CPU's, and still stay sane and claim any reasonable performance under generic loads.
So don't confuse the issue with clusters like that. The "set_affinity()" call simply doesn't have anything to do with them. If you want to move processes between nodes on such a cluster, you'll probably need user-level help, the kernel is unlikely to do it for you.
Linus
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