Re: OT: question about sizing swap for solaris

Hi, Cary:
    The explanation sounds reasonable. But does solaris use this FIFO to
manage its VM? If not , more swap space should not cause hard pageout to
occur more easily, right?  Is there any unix that used this kind of VM
management ?

    To Dan Tow, your words said that if swap size is small, application will
hit "out of memory", while that whitepaper on sun.com says, more swap space
than needed can actually cause hard-pageout to occur more easily. There is
some difference between your opinion and the paper.
    And you said , from experience, you saw some application with a lot of
processes swapped out to disk, without performance impact on end user, is
that an oracle database server? I think that will badly impact on system
performance, according to my experience(Of course my experience is much less
than that of yours).

Regards
Zhu Chao.


----- Original Message ----- 
From: "Cary Millsap" <cary.millsap@xxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, May 03, 2004 10:14 PM
Subject: RE: OT: question about sizing swap for solaris


> Another thing to think about is Belady's Anomaly. Remember that from
> Operating Systems courses? It's a demonstration of how having more
> memory can result in /more/ page faults for systems that use a
> first-in-first-out memory management policy.
>
> http://cne.gmu.edu/modules/vm/yellow/anomaly.html
>
> >

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