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From Rob Coli <>
Subject Re: using too much RAM
Date Thu, 14 Oct 2010 19:07:35 GMT
On 10/14/10 10:59 AM, 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)

There is a log message at startup which will tell you the DiskAccessMode 
and IndexAccessMode in use. It looks like..

INFO 16:46:06,875 DiskAccessMode 'auto' determined to be mmap, 
indexAccessMode is mmap


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