Date: Tue, 22 Jul 2014 11:22:07 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: Polytropon <freebsd@edvax.de> Cc: Arthur Chance <freebsd@qeng-ho.org>, FreeBSD-Questions <freebsd-questions@freebsd.org> Subject: Re: How much swap space for a 32 GB RAM system? Message-ID: <alpine.BSF.2.11.1407221119110.80885@wonkity.com> In-Reply-To: <20140722191548.e3945a1e.freebsd@edvax.de> References: <53CE8BB8.7030303@qeng-ho.org> <20140722191548.e3945a1e.freebsd@edvax.de>
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On Tue, 22 Jul 2014, Polytropon wrote: > On Tue, 22 Jul 2014 17:05:12 +0100, Arthur Chance wrote: >> I'm getting a new machine with 32 GB of memory. The old "twice physical >> memory" sizing seems ridiculous, so how big should I make swap? Do I >> even need swap with this much memory? > > Need? Probably not, but you _never_ know... So preparing > a file-backed swap could be a nice solution: you do not > have to dedicate a fixed size partition for swap, and > depending on your disk setup (maybe SSD?) the speed (_if_ > it gets in use) will be good enough. In order to do this, > you use dd to create a sparse file, File yes, sparse file no. Bad Things(TM) may happen with a sparse file. > configure it as a > memory disk, and enable it with swapctl. In 10.x, this can be done in /etc/fstab.
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