linux-kernel - Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?

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Message-ID: <20080813063533.444c650d@infradead.org>
Date:	Wed, 13 Aug 2008 06:35:33 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pardo <pardo@...gle.com>, akpm@...ux-foundation.org,
	hugh@...itas.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	briangrant@...gle.com, cgd@...gle.com, mbligh@...gle.com,
	Ulrich Drepper <drepper@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: 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 <mingo@...e.hu> 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
sure.



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