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require 'etc'
require 'rbconfig'
require 'concurrent/delay'
module Concurrent
module Utility
# @!visibility private
class ProcessorCounter
def initialize
@processor_count = Delay.new { compute_processor_count }
@physical_processor_count = Delay.new { compute_physical_processor_count }
end
# Number of processors seen by the OS and used for process scheduling. For
# performance reasons the calculated value will be memoized on the first
# call.
#
# When running under JRuby the Java runtime call
# `java.lang.Runtime.getRuntime.availableProcessors` will be used. According
# to the Java documentation this "value may change during a particular
# invocation of the virtual machine... [applications] should therefore
# occasionally poll this property." Subsequently the result will NOT be
# memoized under JRuby.
#
# Ruby's Etc.nprocessors will be used if available (MRI 2.2+).
#
# On Windows the Win32 API will be queried for the
# `NumberOfLogicalProcessors from Win32_Processor`. This will return the
# total number "logical processors for the current instance of the
# processor", which taked into account hyperthreading.
#
# * AIX: /usr/sbin/pmcycles (AIX 5+), /usr/sbin/lsdev
# * Alpha: /usr/bin/nproc (/proc/cpuinfo exists but cannot be used)
# * BSD: /sbin/sysctl
# * Cygwin: /proc/cpuinfo
# * Darwin: /usr/bin/hwprefs, /usr/sbin/sysctl
# * HP-UX: /usr/sbin/ioscan
# * IRIX: /usr/sbin/sysconf
# * Linux: /proc/cpuinfo
# * Minix 3+: /proc/cpuinfo
# * Solaris: /usr/sbin/psrinfo
# * Tru64 UNIX: /usr/sbin/psrinfo
# * UnixWare: /usr/sbin/psrinfo
#
# @return [Integer] number of processors seen by the OS or Java runtime
#
# @see https://github.com/grosser/parallel/blob/4fc8b89d08c7091fe0419ca8fba1ec3ce5a8d185/lib/parallel.rb
#
# @see http://docs.oracle.com/javase/6/docs/api/java/lang/Runtime.html#availableProcessors()
# @see http://msdn.microsoft.com/en-us/library/aa394373(v=vs.85).aspx
def processor_count
@processor_count.value
end
# Number of physical processor cores on the current system. For performance
# reasons the calculated value will be memoized on the first call.
#
# On Windows the Win32 API will be queried for the `NumberOfCores from
# Win32_Processor`. This will return the total number "of cores for the
# current instance of the processor." On Unix-like operating systems either
# the `hwprefs` or `sysctl` utility will be called in a subshell and the
# returned value will be used. In the rare case where none of these methods
# work or an exception is raised the function will simply return 1.
#
# @return [Integer] number physical processor cores on the current system
#
# @see https://github.com/grosser/parallel/blob/4fc8b89d08c7091fe0419ca8fba1ec3ce5a8d185/lib/parallel.rb
#
# @see http://msdn.microsoft.com/en-us/library/aa394373(v=vs.85).aspx
# @see http://www.unix.com/man-page/osx/1/HWPREFS/
# @see http://linux.die.net/man/8/sysctl
def physical_processor_count
@physical_processor_count.value
end
private
def compute_processor_count
if Concurrent.on_jruby?
java.lang.Runtime.getRuntime.availableProcessors
elsif Etc.respond_to?(:nprocessors) && (nprocessor = Etc.nprocessors rescue nil)
nprocessor
else
os_name = RbConfig::CONFIG["target_os"]
if os_name =~ /mingw|mswin/
require 'win32ole'
result = WIN32OLE.connect("winmgmts://").ExecQuery(
"select NumberOfLogicalProcessors from Win32_Processor")
result.to_enum.collect(&:NumberOfLogicalProcessors).reduce(:+)
elsif File.readable?("/proc/cpuinfo") && (cpuinfo_count = IO.read("/proc/cpuinfo").scan(/^processor/).size) > 0
cpuinfo_count
elsif File.executable?("/usr/bin/nproc")
IO.popen("/usr/bin/nproc --all", &:read).to_i
elsif File.executable?("/usr/bin/hwprefs")
IO.popen("/usr/bin/hwprefs thread_count", &:read).to_i
elsif File.executable?("/usr/sbin/psrinfo")
IO.popen("/usr/sbin/psrinfo", &:read).scan(/^.*on-*line/).size
elsif File.executable?("/usr/sbin/ioscan")
IO.popen("/usr/sbin/ioscan -kC processor", &:read).scan(/^.*processor/).size
elsif File.executable?("/usr/sbin/pmcycles")
IO.popen("/usr/sbin/pmcycles -m", &:read).count("\n")
elsif File.executable?("/usr/sbin/lsdev")
IO.popen("/usr/sbin/lsdev -Cc processor -S 1", &:read).count("\n")
elsif File.executable?("/usr/sbin/sysconf") and os_name =~ /irix/i
IO.popen("/usr/sbin/sysconf NPROC_ONLN", &:read).to_i
elsif File.executable?("/usr/sbin/sysctl")
IO.popen("/usr/sbin/sysctl -n hw.ncpu", &:read).to_i
elsif File.executable?("/sbin/sysctl")
IO.popen("/sbin/sysctl -n hw.ncpu", &:read).to_i
else
# TODO (pitr-ch 05-Nov-2016): warn about failures
1
end
end
rescue
return 1
end
def compute_physical_processor_count
ppc = case RbConfig::CONFIG["target_os"]
when /darwin1/
IO.popen("/usr/sbin/sysctl -n hw.physicalcpu", &:read).to_i
when /linux/
cores = {} # unique physical ID / core ID combinations
phy = 0
IO.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 if not 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
rescue
return 1
end
end
end
# create the default ProcessorCounter on load
@processor_counter = Utility::ProcessorCounter.new
singleton_class.send :attr_reader, :processor_counter
def self.processor_count
processor_counter.processor_count
end
def self.physical_processor_count
processor_counter.physical_processor_count
end
end
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