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From Benjamin>
Subject Re: ec2 tests
Date Fri, 18 Jun 2010 17:42:41 GMT
On Fri, Jun 18, 2010 at 8:00 AM, Olivier Mallassi <> wrote:
> I use the default conf settings (Xmx 1G, concurrentwrite 32...) except for
> commitlog and DataFileDirectory : I have a raid0 EBS for commit log and
> another raid0 EBS for data.
> I can't get through 7500 write/sec (when launching 4 in the same
> time).
> Moreover I can see some pending tasks in the
> org.cassandra.db.ColumnFamilyStores.Keyspace1.Standard1 MBean
> Any ideas on the bottleneck?

Your instance has 7.5G of RAM, but you are limiting Cassandra to 1G.
Increase -Xmx to 4G for a start.  You are likely to get significantly
better performance with the ephemeral drive, as well.  I suggest
testing with commitlog on the ephemeral drive for comparison.


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