Thanks for the link but that doesn't answer my question. I happen to know quite allot about tuning Linux/Solaris/*NIX. I'm trying to figure out the limits in cassandra, when it breaks, and why.

So, anyone know of or published benchmarks on messing with these values?

On Tue, Aug 3, 2010 at 7:08 PM, Jonathan Ellis <> wrote:
You need to find out where your bottleneck is, before you start trying
to mitigate it.  Some good first steps are at

On Tue, Aug 3, 2010 at 9:03 PM, Dathan Pattishall <> wrote:
> Do reads at high concurrency get a boost if I where to raise this value?
>   <ConcurrentReads>8</ConcurrentReads>
>   <ConcurrentWrites>32</ConcurrentWrites>
> Any benchmarks/reports showing a good sweet spot per CPU core?

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support