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

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From: Jamie Lokier
Subject: Re: pthread_create() slow for many threads; also time to revisit 64b context switch optimization?
Date: Friday, August 15, 2008 - 8:54 am

Ingo Molnar wrote:


I think the flag makes sense but it's name is confusing - 64BIT for a
flag which means "maybe request 32-bit stack"!  Suggest:

+#define MAP_STACK       0x20000         /* 31bit or 64bit address for stack, */
+                                        /* whichever is faster on this CPU */

Also, is this _only_ useful for thread stacks, or are there other
memory allocations where 31-bitness affects execution speed on old P4s?

-- Jamie
--
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Messages in current thread:
Re: pthread_create() slow for many threads; also time to r ..., Pardo, (Tue Aug 12, 5:45 pm)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Wed Aug 13, 3:44 am)
Re: pthread_create() slow for many threads; also time to r ..., Arjan van de Ven, (Wed Aug 13, 6:35 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 7:21 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Wed Aug 13, 7:25 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 7:36 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Wed Aug 13, 8:10 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 8:21 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Wed Aug 13, 8:40 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 8:55 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Wed Aug 13, 9:02 am)
Re: pthread_create() slow for many threads; also time to r ..., H. Peter Anvin, (Wed Aug 13, 9:05 am)
Re: pthread_create() slow for many threads; also time to r ..., Linus Torvalds, (Wed Aug 13, 10:09 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 11:04 am)
Re: pthread_create() slow for many threads; also time to r ..., Arjan van de Ven, (Wed Aug 13, 11:16 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Wed Aug 13, 11:22 am)
Re: pthread_create() slow for many threads; also time to r ..., Andi Kleen, (Wed Aug 13, 1:42 pm)
Re: pthread_create() slow for many threads; also time to r ..., Andrew Morton, (Wed Aug 13, 1:56 pm)
Re: pthread_create() slow for many threads; also time to r ..., Andi Kleen, (Wed Aug 13, 2:46 pm)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Fri Aug 15, 5:43 am)
Re: pthread_create() slow for many threads; also time to r ..., Andi Kleen, (Fri Aug 15, 6:33 am)
Re: pthread_create() slow for many threads; also time to r ..., Jamie Lokier, (Fri Aug 15, 8:54 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Fri Aug 15, 9:03 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Fri Aug 15, 10:13 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Fri Aug 15, 10:19 am)
Re: pthread_create() slow for many threads; also time to r ..., Ulrich Drepper, (Fri Aug 15, 10:23 am)
Re: pthread_create() slow for many threads; also time to r ..., Ingo Molnar, (Fri Aug 15, 12:00 pm)