RE: Virtual Memory

From: Tanel Poder <tanel.poder.003_at_mail.ee>
Date: Tue, 29 Aug 2006 23:31:54 +0800
Message-id: <00d001c6cb80$42e53d90$6501a8c0@windows01>

Btw, Solaris preallocates only virtual swap space for anonymous allocation, which can reside in RAM in case there is enough of free memory.

This means that you neccessarily don't see physical disk space allocated when your application allocates memory. That's also where the swap -s and swap -l inconsistency comes from...

Tanel.

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mark Brinsmead
Sent: Monday, August 28, 2006 09:16
To: kevinc_at_polyserve.com
Cc: oracle-l_at_freelists.org
Subject: Re: Virtual Memory

Yup. Database processes almost always got whacked... That was my experience, too.

Linux does not preallocate swap, huh? I had never noticed, I suppose because had never bothered to look. I imagine evidence is abundantly clear for anytbody who bothers to look closely enough at "top"... (Or a dozen other things.) I really need to stop relying so much on my sysadmins, I think.

*Sigh*. So the (painful) lessons of history must again be relearned... Somehow, this is not terribly shocking. ;-)

In the meantime, I guess I'll have to watch my Linux boxes more closely. ;-)

--

Cheers,
-- Mark Brinsmead

   Staff DBA,
   The Pythian Group
   http://www.pythian.com/blogs

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Received on Tue Aug 29 2006 - 10:31:54 CDT