Module: TinyMem

Defined in:
lib/tiny_mem.rb

Overview

a tiny memory measurement tool for linux and macos, measuring resident set size (rss) (i.e. total memory allocated and still in use).

ex:

# track a single measurement
TinyMem.measure do
  Array.new(100_000) { 'hello' }
end

=> [70568,  72732, 2164]
    ^before ^after ^diff ... in kilobytes

Class Method Summary collapse

Class Method Details

._mem ⇒ Object 



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# File 'lib/tiny_mem.rb', line 22

def self._mem
  case RUBY_PLATFORM
  when /linux/
    begin
      line = File.read("/proc/#{Process.pid}/status").match(/VmRSS:\s+(\d+)\s*/)
      line ? line[1].to_i : 'unknown'
    rescue Errno::ENOENT
      'error'
    end
  when /darwin/
    `ps -o rss= -p #{Process.pid}`.to_i
  else
    "#{RUBY_PLATFORM} not supported"
  end
end

.measure ⇒ Object 



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# File 'lib/tiny_mem.rb', line 13

def self.measure
  pid = Process.pid
  before = _mem
  yield if block_given?
  after = _mem

  [before, after, after-before]
end