123 lines
2.9 KiB
Ruby
123 lines
2.9 KiB
Ruby
# frozen_string_literal: true
|
|
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'
|
|
|
|
def count
|
|
if RUBY_PLATFORM == 'java'
|
|
count_via_java_runtime
|
|
else
|
|
case RbConfig::CONFIG['host_os']
|
|
when /linux/
|
|
count_via_cpuinfo
|
|
when /darwin|bsd/
|
|
count_via_sysctl
|
|
when /mswin|mingw/
|
|
count_via_win32
|
|
else
|
|
# Try everything
|
|
count_via_win32 ||
|
|
count_via_sysctl ||
|
|
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
|
|
# Get-CimInstance introduced in PowerShell 3 or earlier: https://learn.microsoft.com/en-us/previous-versions/powershell/module/cimcmdlets/get-ciminstance?view=powershell-3.0
|
|
result = run_win32(
|
|
'powershell -command "Get-CimInstance -ClassName Win32_Processor -Property NumberOfCores ' \
|
|
'| Select-Object -Property NumberOfCores"'
|
|
)
|
|
if !result || $?.exitstatus != 0
|
|
# fallback to deprecated wmic for older systems
|
|
result = run_win32("wmic cpu get NumberOfCores")
|
|
end
|
|
|
|
# powershell: "\nNumberOfCores\n-------------\n 4\n\n\n"
|
|
# wmic: "NumberOfCores \n\n4 \n\n\n\n"
|
|
result.scan(/\d+/).map(&:to_i).reduce(:+) if result
|
|
rescue StandardError
|
|
nil
|
|
end
|
|
|
|
def count_via_cpuinfo
|
|
open('/proc/cpuinfo') { |f| f.readlines }.grep(/processor/).size
|
|
rescue StandardError
|
|
nil
|
|
end
|
|
|
|
def count_via_sysctl
|
|
run 'sysctl', '-n', 'hw.ncpu'
|
|
end
|
|
|
|
def run(command, *args)
|
|
cmd = resolve_command(command)
|
|
if cmd
|
|
IO.popen [cmd, *args] do |io|
|
|
io.read.to_i
|
|
end
|
|
else
|
|
nil
|
|
end
|
|
end
|
|
|
|
def run_win32(command, *args)
|
|
IO.popen(command, &:read)
|
|
rescue Errno::ENOENT
|
|
nil
|
|
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)
|
|
IO.popen ['which', command] do |io|
|
|
io.eof? ? nil : command
|
|
end
|
|
end
|
|
end;
|
|
end
|