Specify Number of Cores for a Guest

kromberg · Post by **kromberg** » 12. Feb 2009, 02:58

Is there any way to specify a number of core a guest can use? I have looked all over in the settings and have not found anything.

Keith

kromberg · Post by **kromberg** » 12. Feb 2009, 13:45

The machine that is hosting has 4 physical cores, two Opteron 270s. The guest system only has a single CPU present. I would like the guest to have access to 2 cores, but I just do not see how to grant that access.

Post by **TerryE** » 12. Feb 2009, 14:02

VBox currently only supports a single logical core VM. SMP is in the works but not here yet. Search the forum for other posts discussing this issue.

kromberg · Post by **kromberg** » 12. Feb 2009, 15:15

Thanks for the reply TerryE. Even though VirtualBox only supports a single core/CPU for the guest, I am extremely please with how well it works

Post by **TerryE** » 12. Feb 2009, 17:04

Unless you have a special micro-kernel (as VMware ESX has) it is very difficult to get good performance out of SMP VMs. In general it is better to split the load into multiple VMs -- for example in a LAMP application, move the MySQL D/B into its dedicated applicance and interconnect the LAP appliance with the LM appliance using internal networking.