[Beowulf] file IO benchmark

[Joachim Worringen]

Eugen Leitl wrote:
> On Thu, Nov 24, 2005 at 02:49:08PM +0100, Joachim Worringen wrote:
> 
> 
>>>I've always liked Bonnie++ from fellow Melbournite Russel Coker:
>>>
>>>	http://www.coker.com.au/bonnie++/
>>
>>Well, the problem is that this is single-process, single-file benchmark, 
>>which is often very different from the I/O that a parallel application 
>>performs.
> 
> 
> Is iozone better in that regards? I find its output more difficult
> to parse, even if dumped as an Excel sheet and visualized.

I/O is a complex topic, and a single number rarely tells you enough if you want 
to analyze what's going on. For this purpose, IOzone is very powerful. But 
again, it does only run on a single node (although can fork processes/threads to 
perform concurrent operations). You could start it on multiple nodes, but then 
the I/O is not synhronized, which may or may not what you want to do.

For the purpose of the OP, IOzone is way to complex.

  Joachim

-- 
Joachim Worringen - NEC C&C research lab St.Augustin
fon +49-2241-9252.20 - fax .99 - http://www.ccrl-nece.de