Re: Hammer performance

[Jasse Jansson <jasse@xxxxxxxxxxxxx>]

On Jul 7, 2008, at 11:20 AM, Michael Neumann wrote:

> Hi,
>
> Just compared writing a 1 GB large file with Hammer and got:
>
>   dragnas# dd if=/dev/zero of=test count=2000000
>   2000000+0 records in
>   2000000+0 records out
>   1024000000 bytes transferred in 26.880290 secs (38094827 bytes/sec)
>
> When I do the same (on the same hard disk) with UFS, I get around  
> twice
> the write performance:
>
>   dd if=/dev/zero of=test count=2000000
>   2000000+0 records in
>   2000000+0 records out
>   1024000000 bytes transferred in 12.816585 secs (79896477 bytes/sec)

Doesn't this use of the dd command create a sparse file ???
That might be the answer, but I'm just guessing.





Kaiser Jasse -- Authorized Stealth Oracle

The axioms of wisdom:
1. Go the SPARC way of life
2. You can't conquer the universe without the knowledge of FORTRAN
3. In the Unix realm, 10% of work fixes 90% of the problems