[NTLUG:Discuss] find: 1G < 1024M?

[./aal]

On Tue, Oct 19, 2010 at 5:57 PM, Wayne Walker
<wwalker at solid-constructs.com> wrote:

>> Any ideas why -1G is not working the way I'm expecting?
>
> My _guess_ is granularity.  -1G means "less than 1G".  somehow that
> means 0G which is 0 bytes.
>
> [wwalker at speedy ~] [] $ cd /dev/shm
> [wwalker at speedy shm] [] $ mkdir foo
> [wwalker at speedy shm] [] $ cd foo
> [wwalker at speedy shm] [] $ dd if=/dev/zero bs=1048576 of=1m count=1
> 1+0 records in
> 1+0 records out
> 1048576 bytes (1.0 MB) copied, 0.00148686 s, 705 MB/s
> [wwalker at speedy shm] [] $ dd if=/dev/zero bs=1048576 of=100m count=100
> 100+0 records in
> 100+0 records out
> 104857600 bytes (105 MB) copied, 0.0966602 s, 1.1 GB/s
> [wwalker at speedy shm] [] $ dd if=/dev/zero bs=1048576 of=1023m count=1023
> 1023+0 records in
> 1023+0 records out
> 1072693248 bytes (1.1 GB) copied, 1.16221 s, 923 MB/s
> [wwalker at speedy shm] [] $ dd if=/dev/zero bs=1048576 of=1025m count=1025
> 1025+0 records in
> 1025+0 records out
> 1074790400 bytes (1.1 GB) copied, 4.33152 s, 248 MB/s
> [wwalker at speedy foo] [] $ find . -size -1024M
> .
> ./1m
> ./1023m
> ./100m
> [wwalker at speedy foo] [] $ find . -size -1G
> [wwalker at speedy foo] [] $ touch 0b
> [wwalker at speedy foo] [] $ find . -size -1G
> ./0b
> [wwalker at speedy foo] [] $ ls -l
> total 2204904
> -rw-rw-r-- 1 wwalker wwalker          0 Oct 19 17:54 0b
> -rw-rw-r-- 1 wwalker wwalker  104857600 Oct 19 17:52 100m
> -rw-rw-r-- 1 wwalker wwalker 1072693248 Oct 19 17:53 1023m
> -rw-rw-r-- 1 wwalker wwalker 1074790400 Oct 19 17:53 1025m
> -rw-rw-r-- 1 wwalker wwalker    1048576 Oct 19 17:52 1m
> [wwalker at speedy foo] [] $ find . -size -1024M
> .
> ./0b
> ./1m
> ./1023m
> ./100m
> [wwalker at speedy foo] [] $ find . -size -1G
> ./0b
>


Nicely demo'd Waye


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