Using hard links in Dolphin

[Ben Boeckel]

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Patrick O'Callaghan wrote:

> On Thu, 2009-08-27 at 11:51 -0400, Ben Boeckel wrote:
>> [...] 
>> > Well sure, but I was hoping to avoid an extra copy stage. 
Why 
>> do you say
>> > that copying the files is as fast as linking them? We're 
>> talking about a
>> > couple of GB here. I agree that copying them to a local 
>> directory is not
>> > nearly as slow as the backup phase, but it also takes up 
>> temporary
>> > space. It's just inelegant :-)
>> If you use ext4, copy is just as fast as link (still 
allocates 
>> space, but it's copy-on-write, so it's effectively just a 
link). 
>> Only actually does the copy when the data is changed in 
either.
> 
> Where did you read that? I can find no reference to copy-on-
write in
> ext4. Delayed allocation yes, but that's another matter.
> 
> I did a small test:
> 
>         $ ls -l Test
>         -rw-rw-r-- 1 poc poc 1224693588 2009-08-15 22:14 Test
>         $ time ln Test T
>         
>         real    0m0.022s
>         user    0m0.001s
>         sys     0m0.001s
>         
>         $ rm T
>         $ time cp Test T
>         
>         real    1m1.432s
>         user    0m0.025s
>         sys     0m4.392s
>         $
> 
> i.e. the copy takes about 20MB/s real time (and I'm not even 
using
> drag-and-drop). This is on a USB external drive with ext4.
Maybe I was thinking of btrfs?

>> > Also, (OT) what's the difference between Play, Queue, Play 
>> Next and
>> > Queue Next in this menu?
>> Amarok? Never seen this menu myself :/ .
> 
> Try right-clicking on a media file.
Oh, all mine are in a folder sorted and tagged, none are 
floating around.

> poc

- --Ben
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