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# frozen_string_literal: true
module Parallel
# TODO: inline this method into parallel.rb and kill physical_processor_count in next major release
module ProcessorCount
# Number of processors seen by the OS, used for process scheduling
def processor_count
require 'etc'
@processor_count ||= Integer(ENV['PARALLEL_PROCESSOR_COUNT'] || Etc.nprocessors)
end
# Number of physical processor cores on the current system.
def physical_processor_count
@physical_processor_count ||= begin
ppc =
case RbConfig::CONFIG["target_os"]
when /darwin[12]/
IO.popen("/usr/sbin/sysctl -n hw.physicalcpu").read.to_i
when /linux/
cores = {} # unique physical ID / core ID combinations
phy = 0
File.read("/proc/cpuinfo").scan(/^physical id.*|^core id.*/) do |ln|
if ln.start_with?("physical")
phy = ln[/\d+/]
elsif ln.start_with?("core")
cid = "#{phy}:#{ln[/\d+/]}"
cores[cid] = true unless cores[cid]
end
end
cores.count
when /mswin|mingw/
require 'win32ole'
result_set = WIN32OLE.connect("winmgmts://").ExecQuery(
"select NumberOfCores from Win32_Processor"
)
result_set.to_enum.collect(&:NumberOfCores).reduce(:+)
else
processor_count
end
# fall back to logical count if physical info is invalid
ppc > 0 ? ppc : processor_count
end
end
end
end
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