David, It's expected that, especially when running basho_bench, your cluster will not use that much CPU. Riak is mostly I/O-bound, which is a good thing (vs. wasting CPU not delivering data to you). I would definitely expect network and disk (and possibly RAM) to be the primary limiting factors.
Sean Cribbs <[email protected]> Developer Advocate Basho Technologies, Inc. http://basho.com/ On Dec 8, 2010, at 12:36 PM, David Dawson wrote: > We are currently running a ring of 3 machines each machine with 12 cores, and > have noticed that we seem to only be using 60% of available CPU ( other 40% > is spent idle ) when running basho bench against the cluster. We have tried > changing the 'n_val' from 3 to 1 and also the backend from bitcask to ets, > and it seems to make no difference. Is this expected? > > Also are there any suggested tuning parameters that should be used when > running riak on machines with lots of cores? and if not what would you expect > the bottleneck to be in a cluster? ( cpu / disk io/ memory / network io ) > > Dave > > > > _______________________________________________ > riak-users mailing list > [email protected] > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com _______________________________________________ riak-users mailing list [email protected] http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
