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SubjectRe: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
On Wed, 13 Aug 2008 12:44:45 +0200
Ingo Molnar <> wrote:

> There are various other options to solve the (severe!) performance
> breakdown:
> 1- glibc could start not using MAP_32BIT for 64-bit thread stacks
> (the boxes where context-switching is slow probably do not matter all
> that much anymore - they were very slow at everything 64-bit anyway)
> Pros: easiest solution.
> Cons: slows down the affected machines and needs a new glibc.
> i'd go for 1) or 2).

I would go for 1) clearly; it's the cleanest thing going forward for

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