[Beowulf] file IO benchmark

Joe Landman landman at scalableinformatics.com
Thu Nov 24 10:36:54 EST 2005


Hi Toon:

   A little more than a year ago we use io-bench from HPCC which I did a 
quick MPI port with.  We were showing 1.8-2.1 GB/s sustained to a 
Panasas disk (http://www.panasas.com) system from a cluster.  We also 
used the oocore (see http://www.nsf.gov/div/index.jsp?org=OCI).  Again, 
using the Panasas disk, we were about 5x the speed of the nearest SAN 
solutions on 32 nodes, and more than an order of magnitude faster at 128 
nodes.

   If you want a copy of my rather naive MPI port of io-bench, let me 
see if we can redistribute it.  If you want oocore, surf over to 
http://www.nsf.gov/publications/pub_summ.jsp?ods_key=nsf0605 or grab it 
from http://www.nsf.gov/pubs/2006/nsf0605/oocore.tar.gz

   BTW:  I cannot say enough good things about the Panasas file system. 
  If you want raw speed to your cluster, there aren't too many things 
out there that can give it a run for the money.

Joe

Toon Knapen wrote:
> John Hearns wrote:
>> On Thu, 2005-11-24 at 10:49 +0100, Toon Knapen wrote:
>>
>>
>>> The problem is that our parallel direct out-of-core solver thus needs to
>>> store tmp data on disk. We already encountered problems when people are
>>> using one global NFS mounted filesystem for storing the tmp data of all
>>> nodes in the parallel run. 
>> For temporary data you should strongly encourage your users to write to
>> scratch areas locally on the nodes.
>> Or if you are writing the software, configure your software to do that,
>> maybe using an environment variable.
> 
> We allow users to specify the scratch-directory to make it point to a
> local disk but this does not guarantee us that it will effectively point
> to a local disk (or performant SAN). I don't see how an env.var. could
> solve that?
> 
> t
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