Module: MemoryProfiler

Defined in:
lib/memory-profiler.rb

Defined Under Namespace

Modules: ObjectSpaceAnalyser

Constant Summary collapse

DEFAULTS = 
{
	# general options
	:sort_by  => :current,
	:only     => [],
	:ignore   => [],
	:limit    => 20,
	:force_gc => false,
	# daemon options
	:delay    => 60,
	:filename => nil,
	# ObjectSpaceAnalyser options
	:string_debug  => false,
	:marshal_size => false,
}
@@daemon_thread =

:nodoc:

nil
@@daemon_sync =

:nodoc:

Sync.new
@@start_data =

:nodoc:

nil
@@start_sync =

:nodoc:

Sync.new

Class Method Summary collapse

Class Method Details

._delta(curr, prev, opt = {}) ⇒ Object 



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# File 'lib/memory-profiler.rb', line 225

def self._delta(curr, prev, opt={}) #:nodoc:
	opt = DEFAULTS.merge(opt)

	# determine the difference between current and previous
	delta = Hash.new(0)
	(curr.keys + prev.keys).each do |k|
		delta[k] = curr[k] - prev[k]
	end
	data = delta.map{|k,d| [k, curr[k].to_i, d]}

	# organise data according to given options
	case opt[:sort_by]
	when :none
		opt[:limit] = -1
	when :current
		data = data.sort_by{|k,c,d| -( c ) }
	when :delta
		data = data.sort_by{|k,c,d| -( d ) }
	when :absdelta
		data = data.sort_by{|k,c,d| -( d.abs ) }
	else
		warn "MemoryProfiler: invalid option :sort_by => #{opt[:sort_by].inspect}; using :none"
		opt[:limit] = -1
	end
	data = data[0,opt[:limit]] if opt[:limit] > 0 and opt[:limit] < data.length

	# return it
	data
end

.format(data) ⇒ Object

Formats data, such as that returned by #start , into a printable, readable string.



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# File 'lib/memory-profiler.rb', line 259

def self.format(data)
	" Curr. Delta Class\n" +
	" ----- ----- -----\n" +
	data.map{|k,c,d| sprintf(" %5d %+5d %s\n", c, d, k.name) }.join
end

.report(opt = {}) ⇒ Object

Generates an instantaneous report on the current Ruby ObjectSpace, saved to a text file at: /tmp/memory_profiler-<pid>-<time>.log

Returns the filename used.

See: #start for valid/default options, except that :sort_by may only have the value :current or :none when using #report



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# File 'lib/memory-profiler.rb', line 112

def self.report(opt = {})
	opt = DEFAULTS.merge(opt)
	GC.start if opt[:force_gc]

	data = ObjectSpaceAnalyser.analyse(opt)

	if opt[:sort_by] == :current
		data = data.to_a.sort_by{|k,v| -v }
		data = data[0,opt[:limit]] if opt[:limit] > 0 and opt[:limit] < data.length
	elsif opt[:sort_by] != :none
		warn "MemoryProfiler: invalid option :sort_by => #{opt[:sort_by].inspect}; using :none"
	end

	filename = opt[:filename] || "/tmp/memory_profiler-#{Process.pid}-#{Time.now.to_i}.log"
	File.open(filename, 'w') do |f|
		data.each {|k,c| f.printf( "%5d %s\n", c, k.name ) }
	end

	GC.start if opt[:force_gc]
	filename
end

.restart(opt = {}) ⇒ Object

Stops the current analysis, emits the results, and immediately starts a new analysis.

See: #stop, #start



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# File 'lib/memory-profiler.rb', line 217

def self.restart(opt = {})
	res = self.stop
	self.start(opt)
	res
end

.start(opt = {}, &block) ⇒ Object

If a block is given, executes it and returns a summary. Otherwise, starts the analyser, and waits for a call to #restart or #stop.

Returned data is an array of:

[  [Class, current_usage, usage_delta],  ...  ]

Options:

:sort_by       => :current  # how to order classes;  :current | :delta | :absdelta | :none

:only          => []        # list of only classes to scan;  if empty, scans all classes
:ignore        => []        # list of classes to exclude from reports (including sub-classes and modules, but not namespaces)
:limit         => 20        # how many of the top classes to report (less than 1 means 'all'); only matters if :sort_by is not :none

:force_gc      => true      # if true, forces a garbage collection before and after generating report

:string_debug  => false     # see ObjectSpaceAnalyser#analyse
:marshal_size => false     # see ObjectSpaceAnalyser#analyse



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# File 'lib/memory-profiler.rb', line 153

def self.start(opt = {}, &block)
	opt = DEFAULTS.merge(opt)
	if block_given?
		# get pre-block analysis of ObjectSpace
		GC.start if opt[:force_gc]
		prev = ObjectSpaceAnalyser.analyse(opt)
		GC.start if opt[:force_gc]

		yield

		# get post-block analysis of ObjectSpace
		GC.start if opt[:force_gc]
		curr = ObjectSpaceAnalyser.analyse(opt)

		# calculate the differences before and after execution
		data = self._delta(curr, prev, opt)

		# return it
		GC.start if opt[:force_gc]
		data
	else
		@@start_sync.synchronize(:EX) do
			raise 'already started' if @@start_data

			GC.start if opt[:force_gc]
			@@start_data = [ObjectSpaceAnalyser.analyse(opt), opt]
			GC.start if opt[:force_gc]
		end
		self
	end
end

.start_daemon(opt = {}) ⇒ Object

Begins an analysis thread that runs periodically, reporting to a text file at: /tmp/memory_profiler-<pid>.log

Returns the filename used.

Options:

:delay  => 60     # number of seconds between summaries
:filename => nil  # override the generated default

See: #start for other options



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# File 'lib/memory-profiler.rb', line 60

def self.start_daemon(opt = {})
	opt = DEFAULTS.merge(opt)
	filename = opt[:filename] || "/tmp/memory_profiler-#{Process.pid}.log"
	@@daemon_sync.synchronize(:EX) do
		raise 'daemon process already running' if @@daemon_thread
		@@daemon_thread = Thread.new do
			prev = Hash.new(0)
			file = File.open(filename, 'w')
			loop do
				begin
					GC.start if opt[:force_gc]
					curr = ObjectSpaceAnalyser.analyse(opt)
					data = self._delta(curr, prev, opt)

					file.puts '-'*80
					file.puts Time.now.to_s
					data.each {|k,c,d| file.printf( "%5d %+5d %s\n", c, d, k.name ) }

					prev = curr
					GC.start if opt[:force_gc]
				rescue ::Exception => err
					$stderr.puts "** MemoryProfiler daemon error: #{err}", err.backtrace.map{|b| "\t#{b}" }
				end
				sleep opt[:delay]
			end #loop
		end #Thread.new
	end
	filename
end

.stop ⇒ Object

Stops the current analysis and emits the results.

See: #start



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# File 'lib/memory-profiler.rb', line 190

def self.stop
	prev = nil
	opt  = nil
	@@start_sync.synchronize(:EX) do
		raise 'not started' unless @@start_data
		prev, opt = @@start_data
		@@start_data = nil
	end

	# get the current state of affairs
	GC.start if opt[:force_gc]
	curr = ObjectSpaceAnalyser.analyse(opt)

	# calculate the differences before and after execution
	data = self._delta(curr, prev, opt)

	# return it
	GC.start if opt[:force_gc]
	data
end

.stop_daemon ⇒ Object

Terminates the analysis thread started by #start_daemon



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# File 'lib/memory-profiler.rb', line 93

def self.stop_daemon
	@@daemon_sync.synchronize(:EX) do
		raise 'no daemon process running' unless @@daemon_thread
		@@daemon_thread.kill
		@@daemon_thread.join
		@@daemon_thread = nil
	end
	self
end