Arjan van de Ven wrote:
dbench is catching some attention. We just ran it with default
parameter. I don't think default parameter is the right one to use
on some of our configurations. For example, it shows +100% improvement
never ever consider dbench a serious benchmark; the thing is you can
make dbench a lot better very easy; just make the kernel run one thread
at a time until completion. dbench really gives very variable results,
but it is not really possible to say if +100% or -100% is an improvement
or a degredation for real life. So please just don't run it, or at least
don't interpret the results in a "higher is better" way.
As a disk IO performance benchmark you are absolutely right.
Some people like using it to test VM scalability and throughput
if it is being used on tmpfs. In that case the results are
generally more stable.
--
SUSE Labs, Novell Inc.
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