On Sun, Feb 27, 2005 at 05:05:35PM -0600, Jason Clark wrote:
> I'll hammer it a bit harder and see if I can get it to release those last
> few pages into swap. Thanks.
Well, if you're trying to prove that it will actually swap, then a
simple C program of the form:
int main(int argc, char** argv) {
calloc(100,1024*1024);
sleep(100);
return 0;
}
Will attempt to allocate 100MB of RAM.
The second line of output from "free" will give you a much better
indication of how much RAM is available before it will start swapping.
Paul
> On Sun, 27 Feb 2005, Paul Warren wrote:
>
> > On Fri, Feb 25, 2005 at 05:06:46PM -0600, Jason Clark wrote:
> >> I have recently seen an increase in traffic to one of my sites that is
> >> hosted using UML. Previously, I had allocated 128Megs of RAM and 1 gig of
> >> swap to each UML, but I never got close to touching the swap file. It
> >> always remained at 0% usage. With the traffic spike, I have noticed
> >> that I will drop all the way down to 200k of free RAM on a guest uml,
> >> but the swapfile is still never touched.
> >
> > When you say 200k of free RAM, which figure are you reading? It is
> > normal for Linux to use up all available RAM under normal usage, as it
> > will retain a cache of disk pages. It will throw these away if there is
> > a real need for the RAM. For this reason, free will claim close to 100%
> > memory usage long before it actually hits swap.
> >
> > Paul
> >
>
>
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