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From Jonathan Ellis <>
Subject Re: using too much RAM
Date Thu, 14 Oct 2010 18:06:51 GMT
what does it report when you do allow mmap'd i/o to be used?  (which
you should always do anyway if you care about performance.)

On Thu, Oct 14, 2010 at 12:59 PM, B. Todd Burruss <> wrote:
>  0.7.0-beta2
> top is reporting my cassandra process as using 11g.  i have set
> "disk_access_mode: standard" and Xmx8G (verified via JMX)
> i have only noticed using more RAM than Xmx when using mmap i/o.  this leads
> me to believe that disk_access_mode was not set properly, even though it is
> in the config.  is there a way to verify this via JMX?  (or some other way)
> or any other ideas?

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

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