On Sep 24, 2007, at 11:53 AM, Greg Freemyer wrote:
On 9/24/07, Adil Mujeeb <mujeeb.adil@xxxxxxxxx> wrote:
<snip>
adil@test:~> ls -lh test
-rw-r--r-- 1 adil group 2.0G 2007-09-24 23:51 test
adil@test:~> du -h test
2.1G test <--------------------- why it is showing 2.1 GB
I could not understand this difference. Could anybody explain this
behavioour?
<snip>
ie. "ls" is reporting Gibibytes and "du" is reporting Gigabytes.
That does seem to be the case:
2147483648 / 1024^3 = 2.000
2147483648 / 1000^3 = 2.14748... Which rounds to 2.1.
It's unfortunate that ls in this case doesn't use the new unit's
abbreviation. It does its math so as to return Gibibytes but then
fails to use the "GiB" unit so the user knows it did that.
This whole issue really gets interesting when you start looking at
prices for data-center-class storage. You have big numbers for both
money and bytes. No one would think to say $1M is really $1,048,576
but programmers and users disagree on whether 1MB is 1,048,576 or
1,000,000 bytes.
Fun!
-Mike
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