Vagrantfile. Set memory and CPU

In Linux to find number of CPU cores you can call nproc command.

This works on Mac & Linux:

config.vm.customize ["modifyvm", :id, "--cpus", `#{RbConfig::CONFIG['host_os'] =~ /darwin/ ? 'sysctl -n hw.ncpu' : 'nproc'}`.chomp]

@swrobel As far as I know, sysctl -n hw.ncpu shows the virtual CPU count, but vbox can only go as high as the physical cores, which is sysctl -n hw.physicalcpu_max :)

@patcon where are you reading that virtualbox only supports physical cores? I'm able to use all 4 logical cores on my Macbook...

what's wrong with the setting from vagrant documentation?

v.customize ["modifyvm", :id, "--cpuexecutioncap", "50"]

now you can use these shortcuts:
v.cpus = 4 v.memory = 2048

Like benjamine said, but a more complete example. This is valid for version 2 of Vagrantfile configuration:

config.vm.provider "virtualbox" do |vb|
    vb.memory = "2048"
    vb.cpus = "2"
end