Swap on SSD
freebsd at qeng-ho.org
Wed Feb 7 18:31:25 UTC 2018
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
>> 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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