not enough memory to start domain "xyz"

[evo]

Hey!

I got the message that i don't have enough memory to start a domain.
How can i understand, what exactly the problem is?
Is it a RAM problem on the dom, or in the domain itself, or on the whole
system?

By the way, how can i check up how much RAM i have in the whole laptop?
(I forgot it :D )

Thanks!
regards
evo

[Johannes Graumann]

On Sat, 2019-02-16 at 11:08 +0100, evo wrote:
> Hey!
>
> I got the message that i don't have enough memory to start a domain.
> How can i understand, what exactly the problem is?
> Is it a RAM problem on the dom, or in the domain itself, or on the
> whole
> system?

Others must answer this.

>
> By the way, how can i check up how much RAM i have in the whole
> laptop?
> (I forgot it :D )

'free -m' on the CLI does the trick.

Joh

[evo]

thanks.
i knew about free -m, but i don't know where should i type it, to get
the whole RAM on the machine. What is CLI? :)

[Johannes Graumann]

'Command line interface'. Open a Shell on dom0 and type in that
command.

[Hugo Costa]

It's a RAM problem. The way I usually do it (limited to 8gb on my machine) is I open the vms that need more resources first (in my case, win vms), otherwise you get that.

[evo]

oh, but this can not be true, it shows me 2562 of total memory :D

[Mike Keehan]

Use xentop in dom0 to see where all your memory is being used.

[John Goold]

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On 2/16/19 11:56 AM, evo wrote:
> By the way, how can i check up how much RAM i have in the whole
> laptop? (I forgot it :D )

Surely if you go into BIOS set-up during power-up, you can see how
much RAM the computer has.

- --
John
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[Zrubi]

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On 2/16/19 11:08 AM, evo wrote:
> I got the message that i don't have enough memory to start a
> domain. How can i understand, what exactly the problem is?

The problem is that you have no more free RAM to start that new domain.
- - check your total memory.
- - check the assigned memory of the domain you want to start.
Then consider decrease it.

About how many domain are you able to start at the same time, You are
always limited by your RAM.

The default allocated memory for the domains are too optimistic. Means
if you have low memory (8G or less) you will be limited to a very few
number of domains to start.

> By the way, how can i check up how much RAM i have in the whole
> laptop? (I forgot it :D )

Open a terminal in dom0, then:
xl info

"total memory" will tell you the amount of RAM your machine has.


- --
Zrubi
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[evo]

thanks!
xl info does the job, so i have 16GB RAM, it should be ok to start the
domains i have there. I put them all together and they have about 9GB.
If i decrease the domain RAM, i can start it. But i don't understand
where the bottle neck is. Where are about 5GB RAM??

[Zrubi]

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On 2/17/19 11:00 AM, evo wrote:
> thanks! xl info does the job, so i have 16GB RAM, it should be ok
> to start the domains i have there. I put them all together and they
> have about 9GB. If i decrease the domain RAM, i can start it. But i
> don't understand where the bottle neck is. Where are about 5GB
> RAM??

- - There is a RAM reservation for dom0 itself,
- - and some overhead too.
- - and there are some fragmentation related issue as well.

As we discussed this before several times, it is wise to tune the
memory reservations depending on your available RAM, experience, and
application needs.

Search the archives for suggestions and examples.

- --
Zrubi
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