--- Ed W <lists@wildgooses.com> wrote:
> >> With KVM you can overcommit, as with others I believe, ie for you
> 8GB
> >> machine
> >> you can have 4 VMs with 4GB each; physical RAM will get used
> >> according to
> >> each VM's usage.
> >>
> >
> >
> > Sorry I don't follow. If 4 VMs (not KVM/QEMU) with 4G each then I
> need
> > 16G RAM at least.
> >
>
>
> Only if they all use 4G at the same time
>
> It's common for a machine to be largely idle, so for example you may
> find that the working set is only 100MB despite nominally using 4G.
> This makes it possible to page out most of the instance and require a
>
> lot less ram. You are suddenly stuffed big time though if all your
> machines suddenly come alive and need their ram back...
>
> I think overcommit can be handled slightly more neatly with vservers
> because effectively it's just a bunch of processes which are running
> in
> one operating system with a bit of a partition between them.
Noted and thanks
B.R.
Stephen L
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