Here's an approach to satisfy both camps: set up a ramdisk in that
cheap memory, and swap to that. It's fast, and it keeps the kernel
happy. Disclaimer: I haven't tried this yet, although it's on my list
of things to do sometime just to see how it works...
-Al
Corin Hartland-Swann wrote:
>
> Hi there,
>
> On Mon, 4 Jun 2001, Luca Berra wrote:
> > On Mon, Jun 04, 2001 at 05:13:11AM +0100, Corin Hartland-Swann wrote:
> > > I have a different take on all this. If you're running a server which
> > > lots of RAM is there any point in swapping? Memory is so cheap nowadays
> > > that you can put the most obscene amount of RAM in anyway...
> >
> > uhm, you always need swap, so the kernel can swap out unused pages and free
> > memory for more useful things (e.g. buffer cache)
> >
> > i have 512Mb ram on my home system and i swap even without X
>
> Agreed - the kernel will always swap out a small amount of stuff. This is
> a sensible course of action, but in my experience it only adds up to a few
> megs (5 or so).
>
> My point is that the cost of 5M RAM is about $1.50, so you might as well
> do without swap if it's going to cause you any problems (like the above).
>
> What I really hate is the recommendations that you should always have
> twice as much swap as main memory. I recently tried out FreeBSD on a box
> with 4096M RAM. When I hit auto-allocate (or some such) it gave me 8192M
> swap! As soon as main programs head into swap thrashing ensues and your
> server goes to hell :(
>
> Regards,
>
> Corin
>
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