[OpenIndiana-discuss] [developer] Re: Memory usage concern

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Mon Oct 22 15:34:17 UTC 2012

On Mon, 22 Oct 2012, David Halko wrote:
> I don't really understand how applications can be starved by ZFS unless ZFS
> can not give back the buffers (lots of constant full-table scans?) Has
> Illumos developers really confirmed such a ZFS bug, where it is not
> returning memory to the OS?

It does take a little time to give back the memory.  There are 
data-intensive usage scenarios where ARC is competing with 

Application use of mmap() can cause memory issues since mapped file 
data uses memory in both ARC and page cache (i.e. may double memory 

Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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