DragonFly users List (threaded) for 2008-07
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DragonFly users List (threaded) for 2008-07
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Re: Hammer performance


From: Jasse Jansson <jasse@xxxxxxxxxxxxx>
Date: Mon, 7 Jul 2008 17:08:24 +0200


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






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