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From "B. Todd Burruss" <>
Subject Re: using too much RAM
Date Thu, 14 Oct 2010 19:44:06 GMT
  thx, it does say that in the log, but that is probably just a 
reflection of whatever is read from cassandra.yaml.

i am wondering if some unix tool can tell me if my process is mmap'ing 
files.  maybe lsof?

On 10/14/2010 12:07 PM, Rob Coli wrote:
> 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
> =Rob

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