Re: [9fans] Plan 9 and multicores/parallelism/concurrency?

[a@9srv.net]

// But do you know of any part [of Plan 9] that would be
// beneficial for highly-SMP systems?

Beneficial compared to what, I guess. I agree with your
comment that most of the pressure is on the application
rather than the kernel. The kernel's biggest contribution here
is keeping processes inexpensive compared to unix. As for the
system overall, there's something to be said for decomposing
problems to interfaces that can be represented in the
namespace; then, to a large extent, it doesn't matter whether
we're talking about one box or many.

// On the other hand, may be the trick is not to scale a single
// kernel on something like that but have multiple kernels
// running under something like Xen or kvm.

There's certainly something to be said for this in many cases,
but it hardly takes away any burden from application
developers. They've just got more practice doing it for logically
distinct machines. It lets kernel developers off the hook, but
I'm not sure that's a good thing.

// It'll be interesting to see how a single Plan9 kernel scales on
// something like a Batoka box (256 hardware threads per box,
// 64 physical cores).

Send me one and I'll see if I can find out. ☺

Anthony