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module Rake
# Based on a script at:
# http://stackoverflow.com/questions/891537/ruby-detect-number-of-cpus-installed
class CpuCounter # :nodoc: all
def self.count
new.count_with_default
end
def count_with_default(default=4)
count || default
rescue StandardError
default
end
begin
require 'etc'
rescue LoadError
else
if Etc.respond_to?(:nprocessors)
def count
return Etc.nprocessors
end
end
end
end
end
unless Rake::CpuCounter.method_defined?(:count)
Rake::CpuCounter.class_eval <<-'end;', __FILE__, __LINE__+1
require 'rbconfig'
# TODO: replace with IO.popen using array-style arguments in Rake 11
require 'open3'
def count
if defined?(Java::Java)
count_via_java_runtime
else
case RbConfig::CONFIG['host_os']
when /darwin9/
count_via_hwprefs_cpu_count
when /darwin/
count_via_hwprefs_thread_count || count_via_sysctl
when /linux/
count_via_cpuinfo
when /bsd/
count_via_sysctl
when /mswin|mingw/
count_via_win32
else
# Try everything
count_via_win32 ||
count_via_sysctl ||
count_via_hwprefs_thread_count ||
count_via_hwprefs_cpu_count ||
count_via_cpuinfo
end
end
end
def count_via_java_runtime
Java::Java.lang.Runtime.getRuntime.availableProcessors
rescue StandardError
nil
end
def count_via_win32
require 'win32ole'
wmi = WIN32OLE.connect("winmgmts://")
cpu = wmi.ExecQuery("select NumberOfCores from Win32_Processor") # TODO count hyper-threaded in this
cpu.to_enum.first.NumberOfCores
rescue StandardError, LoadError
nil
end
def count_via_cpuinfo
open('/proc/cpuinfo') { |f| f.readlines }.grep(/processor/).size
rescue StandardError
nil
end
def count_via_hwprefs_thread_count
run 'hwprefs', 'thread_count'
end
def count_via_hwprefs_cpu_count
run 'hwprefs', 'cpu_count'
end
def count_via_sysctl
run 'sysctl', '-n', 'hw.ncpu'
end
def run(command, *args)
cmd = resolve_command(command)
if cmd
Open3.popen3 cmd, *args do |inn, out, err,|
inn.close
err.read
out.read.to_i
end
else
nil
end
end
def resolve_command(command)
look_for_command("/usr/sbin", command) ||
look_for_command("/sbin", command) ||
in_path_command(command)
end
def look_for_command(dir, command)
path = File.join(dir, command)
File.exist?(path) ? path : nil
end
def in_path_command(command)
Open3.popen3 'which', command do |_, out,|
out.eof? ? nil : command
end
end
end;
end