how to find out what is causing huge dentry_cache usage?

Posted by Piavlo on Server Fault See other posts from Server Fault or by Piavlo
Published on 2011-04-27T22:16:48Z Indexed on 2014/06/02 21:31 UTC
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memory

Note that inode_cache & ext3_inode_cache slabs are very small compared to dentry_cache. What happens is that slowly and steadily the within a week dentry_cache grows from 1M to ~5-6G Then I need to run echo 2 > /proc/sys/vm/drop_caches && echo 0 > /proc/sys/vm/drop_caches This started to happening one day on all servers hosting some web code - the developers are saying that they have not changed anything related to filesystem access pattern around the time then the problem started.

The system is centos5 with 2.6.18 kernel so I don't have any instrumentation features available th newer kernels. Any I idea how I can debug the problem? maybe with systemtap? This is a ec2 instance - so not even sure that systemtap will work there.

Thanks Alex

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