Method: LinuxStat::CPU.online

Defined in:
lib/linux_stat/cpu.rb

.online ⇒ Object

Returns the total number of CPU online in the sysetm.

It will read /proc/stat to get the info.

If the info isn’t available, it reads /sys/devices/system/cpu/onfline and performs various job to get one Ruby array.

If the information isn’t available, it will return an empty Array.



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# File 'lib/linux_stat/cpu.rb', line 134

def online
	@@online_file ||= '/sys/devices/system/cpu/online'.freeze
	@@online_readable ||= File.readable?(@@online_file)

	@@stat_file ||= '/proc/stat'.freeze

	ret = []

	if stat?
		IO.readlines(@@stat_file).map { |x|
			v = x.strip[/\Acpu\d*/] &.[](/\d/)
			ret << v.to_i if v
		}
	elsif @@online_readable
		IO.read(@@online_file).split(?,.freeze).each { |x|
			x.strip!
			c = x.split(?-.freeze).map(&:to_i)
			ret.concat(c.length == 2 ? Range.new(*c).to_a : c)
		}
	end

	ret
end