Re: [Xen-users] Memory bound applications

[Taneli Leppä <taneli@xxxxxxxxxx>]

Hello,

Why not just set up the swap in the guests?

Mathias Waack wrote:
> we're using several test- and development-servers as virtual Xen-machines 
> running on one host. Unfortunately our main application needs much memory. 
> Its not a problem at a first view, because usually only very few instances 
> are running at the same time. But if I understand Xen correctly, its only 
> possible to distribute the physical memory of the machine, not the whole 
> virtual memory of dom0. Let me give an example to explain my problem: 
>
> The machine has 4GB of physical memory, the application needs about 1GB 
> (mainly used as a kind of shared cache between the instances). Now I would 
> like to have say 4 test and 4 development machines, thus using 8 doms. Would 
> be easy to give dom0 just 4+x GB swap, and distribute the resulting 8GB on 
> all machines. Yes I know, if all machines are running the whole system would 
> be very busy swapping, but I'm fairly sure this case will be happen very 
> seldom. But this seems to be not possible with Xen. It allows only to 
> distribute the physical memory about the machines and ensures, that the sum 
> of the domX-memory must not be larger than the available physical memory. In 
> my case I can only create 3 doms at the same time. 
>
> Is there something I'm missing? Any solution?
>
> Mathias
>
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--
  Taneli Leppä         | Crasman Co Ltd
  <taneli@xxxxxxxxxx>  | <http://www.crasman.fi/>

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