Date: Wed, 7 Feb 2018 18:31:13 +0000 From: Arthur Chance <freebsd@qeng-ho.org> To: Frank Leonhardt <frank2@fjl.co.uk>, Robert Huff <roberthuff@rcn.com> Cc: freebsd-questions@freebsd.org Subject: Re: Swap on SSD Message-ID: <f1f9b67e-4072-a41c-10ee-6f3d4d34fdce@qeng-ho.org> In-Reply-To: <eb12d261bb10958473f69133d4bb592b@roundcube.fjl.org.uk> References: <26877DEB-034F-422B-918F-2A0D1C381537@kreme.com> <bfd82845ece3604806329336c58610ed@roundcube.fjl.org.uk> <23160.43027.295357.808217@jerusalem.litteratus.org> <eb12d261bb10958473f69133d4bb592b@roundcube.fjl.org.uk>
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On 07/02/2018 15:01, Frank Leonhardt wrote: > On 2018-02-05 18:53, Robert Huff wrote: >> Frank Leonhardt writes: >> >>> FreeBSD doesn't actually swap these days; uses demand paging. >> >> Possible evidence to the contrary: >> On a system running: >> >> FreeBSD 12.0-CURRENT #0 r326723: Sat Dec 9 12:30:04 EST 2017 amd64 >> >> top shows: >> >> last pid: 57956; load averages: 2.02, 2.01, 1.95 up 57+19:09:04 >> 13:49:29 >> 132 processes: 3 running, 129 sleeping >> CPU: 38.7% user, 0.4% nice, 7.9% system, 0.0% interrupt, 53.0% idle >> Mem: 2264M Active, 2303M Inact, 1478M Laundry, 1525M Wired, 761M Buf, >> 115M Free >> Swap: 17G Total, 996M Used, 16G Free, 5% Inuse >> >> So ... is "Swap" an incorrect label, or is actual swapping >> going on? > > Yes, it's an incorrect label. Pretty much like referring to SSD storage as "disk" when it's all rectangular slabs. The historical name lingers on long after the technology becomes obsolete. -- An amusing coincidence: log2(58) = 5.858 (to 0.0003% accuracy).
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