On 2011-05-05 06:30, Hannes Schmidt wrote: > This was my first thought, too. We switched to mmap_index_only and > didn't see any change in behavior. Looking at the smaps file attached > to my original post, one can see that the mmapped index files take up > only a minuscule part of RSS.
I have not looked into smaps before. But it actually seems odd that that mmaped Index files are taking up so *little memory*. Are they only a few kb on disk? Is this a snapshot taken shortly after the process started or before the OOM killer is presumably about to come along. How long does it take to go from 1.1 G to 2.1 G resident? Either way, it would be worthwhile to set one node to standard io to make sure it's really not mmap causing the problem. Anyway, assuming it's not mmap, here are the other similar threads on the topic. Unfortunately none of them claim an obvious solution: http://www.mail-archive.com/user@cassandra.apache.org/msg09279.html http://www.mail-archive.com/user@cassandra.apache.org/msg08063.html http://www.mail-archive.com/user@cassandra.apache.org/msg12036.html http://mail.openjdk.java.net/pipermail/hotspot-dev/2011-April/004091.html
