On 03/22/2011 12:11 PM, Patrick Bartek wrote: > --- On Tue, 3/22/11, Luc MAIGNAN <luc.maignan@xxxxxxxxxxxx> wrote: > >> I use VirtualBox on a RHEL5 with 24 cores (6 x4-cores >> processors). >> But it seems like only one or two processors are used. How >> can I >> configure VirtualBox and/or my virtual machine to allow it >> to use all >> processors ? > Does this not work: Start the VirtualBox interface, choose the virtual machine you want to work on, but don't start it; click on System in the Details list, choose Processor, set Processor(s) slider up to the number of virtual CPUs you want to use. > > >From the VirtualBox v. 3.1.6 manual: > > > 3.4.2 “Processor� tab > > On the “Processor� tab, you can set how many virtual CPU cores the guest operating systems should see. Starting with version 3.0, VirtualBox supports symmetrical multi-processing (SMP) and can present up to 32 virtual CPU cores to each virtual machine. > You should not, however, configure virtual machines to use more CPU cores than you have available physically. > > > > B It sounds as if the host is not allocating VM's to more than a few CPU's. Adding additional CPU's in the VB screen may or may not cause the host O.S. to work as planned. It may just allocate more VM virtual CPU's to the same physical CPU's. I'm thinking that there's a bug in the host O.S. kernel that's not allocating the VM's to all of the CPU's correctly. So "taskset" may be the only answer until he can get on a newer kernel. Kevin
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