Svar: [Orca-users] memory stats

Tommy Henriksen tommy_henriksen at
Tue Feb 24 13:21:52 PST 2004

Hi Eric,

I have read what you have found out regarding Solaris 8, - and file cached memory in I think Solaris internals. I don't know if someone else can clarify this.

You are right about the page scanner, if you have a memory shortage you will see the system scanning more agressivly for pages that have not been accessed recently. You should also be able to see the page residence time will decrease if you experience a memory shortage. Also , - you can see the page scanner sr with the solaris vmstat -p 2 2, - in case you want to verify online on your system.

Best regards /Tommy

>>> "Ziegenhorn, Eric" <eric.ziegenhorn at> 20:26:16 18-02-2004 >>>
I believe that the information on Orca's homepage at is somewhat
dated.  In particular, I believe it describes Solaris behavior for versions
6 and 7.  Solaris 8 introduced a new VM design that does not follow the
graph explanations.  My reference is primarily 

Solaris 8 reports free memory differently, and in a way that as I understand
it means free memory should not decrease over time.  Basically, the
difference from before is that Solaris 8 includes the in-memory file system
cache as free memory.  Also, it should be pointed out that Solaris 8 memory
page scan rates should be 0.  If it is higher than zero then you are in
trouble and should buy more memory.

This is what I have figured out.  If anyone can explain, discredit or verify
my conclusions, that would be appreciated.  I am currently trying to get a
better grasp for what our Orca measurements are what they are, and if they
are in a good range.
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