Date: Sun, 06 Dec 1998 09:19:45 -0800 From: Michael Galassi <nerd@xyz.com> To: "Gary Palmer" <gpalmer@FreeBSD.ORG> Cc: Marcel van Kervinck <marcelk@stack.nl>, smp@FreeBSD.ORG Subject: Re: Pthreads and SMP Message-ID: <199812061719.JAA51729@percy.xyz.com> In-Reply-To: Your message of "Sun, 06 Dec 1998 11:41:36 EST." <51430.912962496@gjp.erols.com>
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Marcel van Kervinck wrote: >> Perhaps I've missed something obvious But: it seems to me that a process >> that uses multiple threads doesn't spread them over more processors? >> I tried on a dual PII, running fbsd 3.0, and a program that simply did >> a few pthread_create() calls. Gary Palmer wrote: >Correct. No-one with enough skill to do the work necessary to get thread >migration supported has had the time... Unless I'm wearing serious blinders I fail to see this as a real problem. Unless you have only a tiny number of procs on the system it would seem like keeping related threads together would be a good thing. If you had multiple closely related threads on seperate procs and they decided to acctually access their shared data I'm guessing you would see a lot of cache thrashing. Best keep the threads together if you can move whole procs elsewhere to take up the slack. All this is, of course, IMHO. -michael To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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