VirtualBox performance

Mikhail Tsatsenko m.tsatsenko at
Fri Nov 14 19:06:24 UTC 2014

14.11.2014 4:33 пользователь "Peter Ross" <Peter.Ross at>
> Hi all,
> I am running VirtualBox on a new server (a Dell T620).
> Inside is Oracle Linux. I run a Java app and it is very slow to start.
In order to utilize multiple CPUs inside virtual machine you have to enable
io-apic setting.
> Memory should not be an issue. I have 32 GB and 8 GB for the VM.
> The server has 2 Xeon CPUs with 4 core each (hypertthreated so VBox sees
16 CPUs).
> I do not see any difference between using 1 CPU or 16 for the VM..
> Interestingly all the host CPUs are 60-70% in system calls when I run it
on 16 CPUs, according to top.
> I am tempted to experiment with CPU sets, btw.
> I wonder whether VirtualBox and multiple CPUs are a good mix at all..
> Do you have any recommendations how to speed up my VM and Java?
> Thank you
> Peter
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