Date: Wed, 10 Feb 1999 16:36:15 -0500 (EST) From: "John S. Dyson" <dyson@iquest.net> To: tlambert@primenet.com (Terry Lambert) Cc: dg@root.com, dillon@apollo.backplane.com, tlambert@primenet.com, kuku@gilberto.physik.RWTH-Aachen.DE, hackers@FreeBSD.ORG Subject: Re: portability of shm, mmap, pipes and socket IPC Message-ID: <199902102136.QAA02545@y.dyson.net> In-Reply-To: <199902101724.KAA13526@usr07.primenet.com> from Terry Lambert at "Feb 10, 99 05:24:00 pm"
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Terry Lambert said: > > I guess if we are still examining Linux vs. FreeBSD programming, then > I should probably point out that SysV SHM is faster than non-anonymous > mmap'ed memory, because writes don't have to be written through to the > backing object. > The condition for paging out pages to SysV SHM are very similar to anonymous MMAPed regions. There is no effective difference. If you use file backed MMAPed regions, there are some time consuming sync operations though. -- John | Never try to teach a pig to sing, dyson@iquest.net | it makes one look stupid jdyson@nc.com | and it irritates the pig. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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