Yes, on linux atleast, lsof would show you that. lsof -d mem -p <pid>. You can also look at /proc/<pid>/maps, again linux centric.
Sridhar On Thu, Oct 14, 2010 at 3:44 PM, B. Todd Burruss <bburr...@real.com> wrote: > 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 >> >> -- Sridhar
