[infinispan-dev] default value for virtualNodes

[Dan Berindei]

On Fri, Jan 27, 2012 at 12:42 AM, Manik Surtani <manik at jboss.org> wrote:
>
> On 26 Jan 2012, at 22:37, Sanne Grinovero wrote:
>
>
> Yes, we should profile a session with vnodes enabled.
>
>
> Manik, we're using VNodes in our performance tests. The proposal is if
> we can provide a good default value, as the feature is currently
> disabled by default.
>
>
> I'm also concerned about the implications of enabling this by default, in
> terms of memory usage, etc.
>

Memory usage is definitely not a problem, each virtual node costs us
only 1*nodes extra ints and 1*nodes extra references in the "position
map" in AbstraceWheelConsistentHash.

Any CH performance drop should be compensated by the fact that work is
more evenly spread.

Cheers
Dan