Hello Corin,
Corin Langosch:
> I love aufs but wonder if it's kernel page cache friendly.
I love her too, but sometimes she makes me really confused. :-)
> In my setup I have a shared folder with lot's of tools, libs, etc.
> installed. I now mount this read-only to several locations and start the
> tools from there. Does this result in reduced memory usage (as it would
> be the case if I started the same tool several times from the same path
> without using aufs)?
Essentially page cache for /home/shared exists only one in your system,
which means your "tool" and its libraries never consume memory twice.
But other caches are consumed by aufs.
For example, you know dcache (or dentry cache).
Since /home/merged1/tool and /home/merged2/tool are different logically,
they consume dcache individually.
On my system, kernel prints this at boot time.
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
> BTW: Is aufs really no longer maintained anymore like wikipedia
> (http://en.wikipedia.org/wiki/UnionFS) tells me? Which one is better in
> terms of longtime support?
aufs1 is not maintained, but aufs2 is.
See http://aufs.sf.net
J. R. Okajima
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