[Beowulf] What kind of I/O benchmark ?

Joe Landman landman at scalableinformatics.com
Wed Mar 23 07:30:46 PST 2005

Velu Erwan wrote:

> Does other people are working on such kind of application oriented
> benchmark ?


> I was heard that some BLAST code could be used for such use, does some
> of you follow this way of validating/benchmarking clusters ?

Yes it can.  You will be throttled by the speed of mmap implementation 
if you are using NCBI BLAST, and you will spend most of the time paging 
if you don't segment your databases (nt in particular).  But you could 
use BLAST to benchmark the IO.  Not sure how useful it is though for 
what you want to measure.

What specifically are you trying to measure (in the context of which 
applications are you going to run)?  If you do large block sequential 
IO's you will want a very different benchmark test from small block 
random IOs and seeks.


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Joseph Landman, Ph.D
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