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When I was using Virtual Box in Windows 7, I could choose how many CPU cores to assign to the guest OS. Now I'm using Linux, and when I installed Virtual Box, I couldn't find that option. System Monitor shows that when the VM is busy only one CPU core goes to 100% while the rest are near 0%. How can I make Virtual Box in Linux use multiple CPU cores?
tony_sid
Posted 2010-07-28T11:08:16.950
Reputation: 11 651
0
I found the solution. It turns out I was using an older version of Virtual Box. I upgraded to a newer version and I get the options for multiple CPU cores.
tony_sid
Posted 2010-07-28T11:08:16.950
Reputation: 11 651
4
I can simply set that in the VMs settings - change its details, go to the "System" tab, click on "Processor" and slide the slider to the right - done.
Did you check if the Host OS can actually see the correct number of cores?
You might want to check /proc/cpuinfo for that.
Picture of the settings tab / slider on OS X:
phrozen77
Posted 2010-07-28T11:08:16.950
Reputation: 101
Yes, all four CPU cores are seen. The Linux version of Virtual Box does not look like that. That's how the Windows version looks. – tony_sid – 2010-07-28T11:36:51.750
Actually, that's OS X ;) (admittedly with the settings displayed for a XP Guest).
Glad it now seems to work with your updated version :) – phrozen77 – 2010-07-30T07:04:01.747
Yeah I have it on OSX too and that's what it looks like. The newest version pretty much has the same features across Windows, OSX, and Linux. – tony_sid – 2010-07-31T12:33:21.803
I think you need a 64-bit host OS and hardware virtualization to present multiple cores to the guest. Does your Linux installation meet those requirements? – coneslayer – 2010-07-28T11:25:39.700
I'm using a 64-bit Linux. Hardware virtualization is turned on. – tony_sid – 2010-07-28T11:28:07.933