Messages in this thread | | | Date | Wed, 23 Nov 2005 14:19:08 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [patch] SMP alternatives |
| |
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.
And yes, Sun will die. Single-thread performance matters a hell of a lot, and any company that bets that it doesn't, is a failure.
Linus - 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/
| |