Date: Tue, 23 Feb 2010 22:01:06 +0000 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: Is there a command to load all swap into the memory? Message-ID: <20100223220106.71af7f6f@gumby.homeunix.com> In-Reply-To: <20100223145928.A67451@starfire.mn.org> References: <4B84396F.3030305@rawbw.com> <20100223145928.A67451@starfire.mn.org>
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On Tue, 23 Feb 2010 14:59:28 -0600 John <john@starfire.mn.org> wrote: > On Tue, Feb 23, 2010 at 12:24:15PM -0800, Yuri wrote: > > I am asking out of curiosity. > > 'top' describes the memory state on my machine like this: > > Mem: 1085M Active, 196M Inact, 301M Wired, 36M Cache, 112M Buf, > > 1366M Free Swap: 16G Total, 757M Used, 16G Free, 4% Inuse > > > > There is enough space in memory to load back all swap. Is there a > > command to do that for all swap? > > This will speed up immediate system response in the future. > > Well, you have assumed that the furture demand on the system will > involve the pages which are swapped out. If that assumption is > false, bringing them back into memory now will dramatically slow > down system responsiveness in the future, because the scarce resoure > will be free memory pages, which was the reason they were swapped > out in the first place. And AFAIK pages that are read back into memory are retained in swap to avoid haing to page them out again.
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