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130 lines
3.2 KiB
Ruby
130 lines
3.2 KiB
Ruby
# Some based on : https://gist.github.com/277289
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#
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# This is a rudimentary script that allows us to
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# quickly determine if any gems are slowing down startup
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require 'benchmark'
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require 'fileutils'
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module RequireProfiler
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class << self
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attr_accessor :stats
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def profiling_enabled?
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@profiling_enabled
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end
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def profile
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start
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yield
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stop
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end
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def start(tmp_options={})
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@start_time = Time.now
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[ ::Kernel, (class << ::Kernel; self; end) ].each do |klass|
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klass.class_eval do
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def require_with_profiling(path, *args)
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RequireProfiler.measure(path, caller, :require) { require_without_profiling(path, *args) }
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end
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alias require_without_profiling require
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alias require require_with_profiling
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def load_with_profiling(path, *args)
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RequireProfiler.measure(path, caller, :load) { load_without_profiling(path, *args) }
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end
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alias load_without_profiling load
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alias load load_with_profiling
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end
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end
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# This is necessary so we don't clobber Bundler.require on Rails 3
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Kernel.class_eval { private :require, :load }
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@profiling_enabled = true
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end
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def stop
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@stop_time = Time.now
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[ ::Kernel, (class << ::Kernel; self; end) ].each do |klass|
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klass.class_eval do
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alias require require_without_profiling
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alias load load_without_profiling
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end
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end
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@profiling_enabled = false
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end
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def measure(path, full_backtrace, mechanism, &block)
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# Path may be a Pathname, convert to a String
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path = path.to_s
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@stack ||= []
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self.stats ||= {}
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stat = self.stats.fetch(path){|key| self.stats[key] = {calls: 0, time: 0, parent_time: 0} }
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@stack << stat
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time = Time.now
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begin
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output = yield # do the require or load here
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ensure
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delta = Time.now - time
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stat[:time] += delta
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stat[:calls] += 1
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@stack.pop
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@stack.each do |frame|
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frame[:parent_time] += delta
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end
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end
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output
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end
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def time_block
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start = Time.now
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yield
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Time.now - start
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end
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def gc_analyze
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ObjectSpace.garbage_collect
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gc_duration_start = time_block { ObjectSpace.garbage_collect }
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old_objs = ObjectSpace.count_objects
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yield
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ObjectSpace.garbage_collect
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gc_duration_finish = time_block { ObjectSpace.garbage_collect }
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new_objs = ObjectSpace.count_objects
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puts "New objects: #{(new_objs[:TOTAL] - new_objs[:FREE]) - (old_objs[:TOTAL] - old_objs[:FREE])}"
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puts "GC duration: #{gc_duration_finish}"
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puts "GC impact: #{gc_duration_finish - gc_duration_start}"
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end
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end
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end
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# RequireProfiler.gc_analyze do
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# # require 'mime-types'
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# require 'highline'
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# end
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# exit
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RequireProfiler.profile do
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Bundler.definition.dependencies.each do |dep|
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begin
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require dep.name unless dep.name =~ /timecop/
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rescue Exception
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# don't care
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end
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end
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end
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sorted = RequireProfiler.stats.to_a.sort{|a,b| b[1][:time] - b[1][:parent_time] <=> a[1][:time] - a[1][:parent_time]}
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sorted[0..120].each do |k, v|
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puts "#{k} : time #{v[:time] - v[:parent_time]} "
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end
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