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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