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

[Bob Friesenhahn]

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 
applications.

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 
requirement).

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