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List Archive: gentoo-performance
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To: gentoo-performance@g.o
From: Gyujin Park <gpark@...>
Subject: RE: swap?
Date: Fri, 30 Jul 2004 18:39:37 -0600
My previous server OS choice was Red Hat, which did often change to swap. I
though Gentoo did it too.

Thanks,

Tom

On Fri Jul 30 13:22 , 'Florian Koenig' <k0255220@...> sent:

>> > Also, when I do
>> > 
>> > free
>> > 
>> > it shows no swap is used even though physical memory level is 98%.
>> 
>> free shows no swap used on my system either. and 90% or more physical
>> memory use is standard for the linux kernel.
>
>Exactly. In contrast to Windows NT/2000/XP, which tries to swap out as much
pages as possible, Linux tries to keep the memory mostly filled. Lots of the
memory gets used as cache and buffer so you might actually gain some performance.
>
>The difference between Windows and Linux stems from their different origins.
Linux/Unix was always meant to be a server system where the set of running
processes doesn't change that often. Therefore it tries to keep pages in memory
for as long as possible.
>
>Windows' approach to the problem is geared to desktop performance and so it
swaps out 'unused' pages as soon as possible to free memory and keep startup time
short for programs being loaded.
>
>The behaviour of Linux is actually hotly debated by the developers as you can
see on these two pages, which btw also include some hints on how to tune swapping:
>
>http://kerneltrap.org/node/view/3000
>http://kerneltrap.org/node/view/3202
>
>Have a nice weekend and kind regards
>floki
>
>
>--
>gentoo-performance@g.o mailing list
>


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-- Aaron Walker
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Updated Jun 17, 2009

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