Date: Mon, 3 Apr 95 11:22:17 MDT From: terry@cs.weber.edu (Terry Lambert) To: davidg@Root.COM Cc: jkh@violet.berkeley.edu, hackers@FreeBSD.org Subject: Re: any interest? Message-ID: <9504031722.AA07149@cs.weber.edu> In-Reply-To: <199504020638.WAA00228@corbin.Root.COM> from "David Greenman" at Apr 1, 95 10:38:16 pm
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> >The usual way under SunOS is 'mkfile 4m /some/file'. This way > >no disk blocks are allocated until they are actually needed. > >Here is a clone implementation of mkfile, done by Robert Claeson > >(prc@erbe.se). > > Swapfiles should be pre-allocated to maximize contiguousness. Not to metion keeping the machines head from exploding when your disk is full and you need to swap more than you have swapped previously. Remember that with an overcommit architecture, failure to acquire needed swap means some process dies, and it's not necessarily the process that caused you to run out; it's pretty much any process (that's actually doing something) at random. There's also no guarantee that a swap file isn't "special"... that is, that the system will be able to recover gracefully from suddenly finding out that it has less swap available than it thought it had. Terry Lambert terry@cs.weber.edu --- Any opinions in this posting are my own and not those of my present or previous employers.
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