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

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Message-ID: <48A2F157.7000303@redhat.com>
Date:	Wed, 13 Aug 2008 07:36:07 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Arjan van de Ven <arjan@...radead.org>, 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,
	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?

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Ingo Molnar wrote:
> not sure exactly what numbers you mean, but there are lots of numbers in 
> the first mail, attached below. For example:

I mean numbers indicating that it doesn't hurt performance on any of
today's machines.  If there are machines where it makes a difference
then we need the flag to indicate the _preference_ for a low stack, as
opposed to indicating a _requirement_.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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