Adding additional CPU fails without error

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Adding additional CPU fails without error

Postby Mitchellmitchellmitchell » 9. Aug 2019, 11:31

I have a headless Ubuntu host running a headless Ubuntu guest.

The guest was initially configured with 1 CPU. I tried to add CPU's using the following commands

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VBoxManage modifyvm "VM name" --cpuhotplug on
VBoxManage modifyvm "VM name" --cpus 4
VBoxManage modifyvm "VM name" --plugcpu 1
VBoxManage modifyvm "VM name" --plugcpu 2
VBoxManage modifyvm "VM name" --plugcpu 3

None of this returned any errors. Then, loggin into my host I see nothing has changed. top, htop and lshw all show only one cpu. I'm not sure what I'm doing wrong and how to debug this issue.
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Re: Adding additional CPU fails without error

Postby socratis » 14. Aug 2019, 12:20

Does your Ubuntu guest even support CPU hot-plugging? And which Ubuntu are we talking about, 8.04, 16.10, 19.04? You got to give some more details about the setup.
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