Module: HeapScope::Runtime::WindowsRSS

Defined in:
lib/heapscope/runtime/windows_rss.rb

Overview

Windows working-set size via PowerShell (no native gem required). Optionally uses stdlib Fiddle when already loaded / available without warnings noise.

Class Method Summary collapse

Class Method Details

.api ⇒ Object 



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# File 'lib/heapscope/runtime/windows_rss.rb', line 32

def api
  @api ||= build_api
end

.build_api ⇒ Object 



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# File 'lib/heapscope/runtime/windows_rss.rb', line 36

def build_api
  Module.new do
    extend Fiddle::Importer

    dlload "kernel32.dll", "psapi.dll"
    typealias "DWORD", "unsigned long"
    typealias "HANDLE", "void*"
    typealias "SIZE_T", "size_t"
    typealias "BOOL", "int"

    const_set(
      :Counters,
      struct([
               "DWORD cb",
               "DWORD PageFaultCount",
               "SIZE_T PeakWorkingSetSize",
               "SIZE_T WorkingSetSize",
               "SIZE_T QuotaPeakPagedPoolUsage",
               "SIZE_T QuotaPagedPoolUsage",
               "SIZE_T QuotaPeakNonPagedPoolUsage",
               "SIZE_T QuotaNonPagedPoolUsage",
               "SIZE_T PagefileUsage",
               "SIZE_T PeakPagefileUsage"
             ])
    )

    extern "HANDLE GetCurrentProcess()"
    extern "BOOL GetProcessMemoryInfo(HANDLE, void*, DWORD)"

    define_singleton_method(:working_set_bytes) do
      counters = const_get(:Counters).malloc
      counters.cb = const_get(:Counters).size
      ok = GetProcessMemoryInfo(GetCurrentProcess(), counters, counters.cb)
      ok.zero? ? nil : counters.WorkingSetSize
    end
  end
end

.fiddle_working_set_bytes ⇒ Object 



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# File 'lib/heapscope/runtime/windows_rss.rb', line 23

def fiddle_working_set_bytes
  return nil unless Object.const_defined?(:Fiddle)

  require "fiddle/import"
  api.working_set_bytes
rescue StandardError
  nil
end

.powershell_working_set_bytes ⇒ Object 



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# File 'lib/heapscope/runtime/windows_rss.rb', line 14

def powershell_working_set_bytes
  out = `powershell -NoProfile -Command "(Get-Process -Id #{Process.pid}).WorkingSet64"`.to_s.strip
  return nil if out.empty?

  Integer(out)
rescue StandardError
  nil
end

.working_set_bytes ⇒ Object 



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# File 'lib/heapscope/runtime/windows_rss.rb', line 10

def working_set_bytes
  powershell_working_set_bytes || fiddle_working_set_bytes
end