Class: Rack::Bug::MemoryPanel

Inherits:
Panel
  • Object
show all
Defined in:
lib/rack/bug/panels/memory_panel.rb

Instance Attribute Summary

Attributes inherited from Panel

#request

Instance Method Summary collapse

Methods inherited from Panel

#call, #initialize, #panel_app, #render

Methods included from Render

#compile, #compile!, #compiled_source, #method_name, #method_name_without_locals, #render_template, #signed_params

Constructor Details

This class inherits a constructor from Rack::Bug::Panel

Instance Method Details

#after(env, status, headers, body) ⇒ Object 



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# File 'lib/rack/bug/panels/memory_panel.rb', line 40

def after(env, status, headers, body)
  @total_memory = get_memory_usage
  @memory_increase = @total_memory - @original_memory
end

#before(env) ⇒ Object 



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# File 'lib/rack/bug/panels/memory_panel.rb', line 36

def before(env)
  @original_memory = get_memory_usage
end

#get_memory_usage ⇒ Object 



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# File 'lib/rack/bug/panels/memory_panel.rb', line 11

def get_memory_usage
  if defined? WIN32OLE
    wmi = WIN32OLE.connect("winmgmts:root/cimv2")
    mem = 0
    query = "select * from Win32_Process where ProcessID = #{$$}"
    wmi.ExecQuery(query).each do |wproc|
      mem = wproc.WorkingSetSize
    end
    mem.to_i / 1000
  elsif pages = ::File.read("/proc/self/statm") rescue nil
    pages.to_i * statm_page_size
  elsif proc_file = ::File.new("/proc/#{$$}/smaps") rescue nil
    proc_file.map do |line|
      size = line[/Size: *(\d+)/, 1] and size.to_i
    end.compact.sum
  else
    `ps -o vsz= -p #{$$}`.to_i
  end
end

#has_content? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rack/bug/panels/memory_panel.rb', line 49

def has_content?
  false
end

#heading ⇒ Object 



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# File 'lib/rack/bug/panels/memory_panel.rb', line 45

def heading
  "#{@memory_increase} KB Δ, #{@total_memory} KB total"
end

#statm_page_size ⇒ Object

try to get and cache memory page size. falls back to 4096.



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# File 'lib/rack/bug/panels/memory_panel.rb', line 32

def statm_page_size
  @statm_page_size ||= (`getconf PAGESIZE`.strip.to_i rescue 4096) / 1024
end