Date: Wed, 26 Aug 1998 01:55:00 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: mike@smith.net.au (Mike Smith) Cc: michaelh@cet.co.jp, gpalmer@FreeBSD.ORG, chuckr@glue.umd.edu, freebsd-current@FreeBSD.ORG Subject: Re: Threads across processors Message-ID: <199808260155.SAA00915@usr04.primenet.com> In-Reply-To: <199808251338.NAA02533@dingo.cdrom.com> from "Mike Smith" at Aug 25, 98 01:38:18 pm
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> > Our pipes are very fast. SYSV SHM's blunder is that it uses full blown > > system calls for synchronization. > > Yes. Anyone that thinks in terms of a context switch per transaction > between coprocesses is not designing properly. Using a shared mmap() > region and datastructures that don't require locking is another > cost-effective technique. A dirty little secret is that SYSV SHM in FreeBSD is much faster than mmap, because pages backed by anonymous pages instead of a vnode pager object do not have to be written through... Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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