Date: Sat, 30 Jun 2001 22:28:29 -0500 From: Alfred Perlstein <bright@sneakerz.org> To: "Michael C . Wu" <keichii@peorth.iteration.net> Cc: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>, freebsd-smp@freebsd.org, freebsd-hackers@freebsd.org Subject: Re: Quick question: AIO / SMP / process-based threading Message-ID: <20010630222829.E84523@sneakerz.org> In-Reply-To: <20010630005749.A72545@peorth.iteration.net>; from keichii@iteration.net on Sat, Jun 30, 2001 at 12:57:49AM -0500 References: <Pine.LNX.4.20.0106300538250.19544-100000@www.everquick.net> <20010630005749.A72545@peorth.iteration.net>
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* Michael C . Wu <keichii@iteration.net> [010630 14:05] wrote: > On Sat, Jun 30, 2001 at 05:47:49AM +0000, E.B. Dreger scribbled: > | 1. Is AIO SMP-safe? > > AIO is not safe, SMP or not. > > | 2. If not, how could one force coherency? (Read and rewrite locked > | a word from each cache line?) Is it worth the effort, or should > | one not use AIO across process boundaries? > > Don't use it. Can you point to some specific PRs about this or crashdumps before (or at least while) taking pot shots at the AIO implementation? thanks, -- -Alfred Perlstein [alfred@freebsd.org] Ok, who wrote this damn function called '??'? And why do my programs keep crashing in it? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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