Messages in this thread |  | | | Date | Wed, 23 Nov 2005 17:20:56 -0500 | | From | Daniel Jacobowitz <> | | Subject | Re: [patch] SMP alternatives |
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On Wed, Nov 23, 2005 at 02:19:08PM -0800, Linus Torvalds wrote: > > > On Wed, 23 Nov 2005, Daniel Jacobowitz wrote: > > > > I don't think I see the point. This would let you optimize for the > > "multi-threaded, but hasn't created any threads yet" or even > > "multi-threaded, but not right now" cases. But those really aren't the > > interesting case to optimize for - that's the equivalent of supporting > > CPU hotplug. > > NO. > > There is not a _single_ compiler that is multi-threaded, and I'd argue > that there probably never will be. It's pointless. > > There's a _lot_ of really performance-sensitive stuff that will NEVER EVER > be threaded. You may run a hundred copies of them at the same time, but > every single copy will be single-threaded. > > And this will optimize that case in a BIG way. > > This is _not_ about "CPU hotplug". This is _not_ about "threaded apps > before they are threaded". This is all about the fact that serious > computation is done single-threaded, and anybody who thinks that > single-threading is going away is so totally out to lunch that it's not > even fun.
I get the feeling you didn't read my message at all. Let me try it again.
Why should we use a silicon based solution for this, when I posit that there are simpler and equally effective userspace solutions?
-- Daniel Jacobowitz CodeSourcery, LLC - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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