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# Profile provides a way to Profile your Ruby application.
#
# Profiling your program is a way of determining which methods are called and
# how long each method takes to complete. This way you can detect which
# methods are possible bottlenecks.
#
# Profiling your program will slow down your execution time considerably,
# so activate it only when you need it. Don't confuse benchmarking with
# profiling.
#
# There are two ways to activate Profiling:
#
# == Command line
#
# Run your Ruby script with <code>-rprofile</code>:
#
# ruby -rprofile example.rb
#
# If you're profiling an executable in your <code>$PATH</code> you can use
# <code>ruby -S</code>:
#
# ruby -rprofile -S some_executable
#
# == From code
#
# Just require 'profile':
#
# require 'profile'
#
# def slow_method
# 5000.times do
# 9999999999999999*999999999
# end
# end
#
# def fast_method
# 5000.times do
# 9999999999999999+999999999
# end
# end
#
# slow_method
# fast_method
#
# The output in both cases is a report when the execution is over:
#
# ruby -rprofile example.rb
#
# % cumulative self self total
# time seconds seconds calls ms/call ms/call name
# 68.42 0.13 0.13 2 65.00 95.00 Integer#times
# 15.79 0.16 0.03 5000 0.01 0.01 Fixnum#*
# 15.79 0.19 0.03 5000 0.01 0.01 Fixnum#+
# 0.00 0.19 0.00 2 0.00 0.00 IO#set_encoding
# 0.00 0.19 0.00 1 0.00 100.00 Object#slow_method
# 0.00 0.19 0.00 2 0.00 0.00 Module#method_added
# 0.00 0.19 0.00 1 0.00 90.00 Object#fast_method
# 0.00 0.19 0.00 1 0.00 190.00 #toplevel
module Profiler__
# internal values
@@start = @@stack = @@map = @@array = nil
PROFILE_PROC = proc{|event, file, line, id, binding, klass|
case event
when "call", "c-call"
now = Process.times[0]
@@stack.push [now, 0.0]
when "return", "c-return"
now = Process.times[0]
key = [klass, id]
if tick = @@stack.pop
data = begin
@@map[key] ||= [0, 0.0, 0.0, key]
rescue NoMethodError
@@array.find{|i| i[3] == key} || (@@array << [0, 0.0, 0.0, key])[-1]
end
data[0] += 1
cost = now - tick[0]
data[1] += cost
data[2] += cost - tick[1]
@@stack[-1][1] += cost if @@stack[-1]
end
end
}
module_function
def start_profile
@@start = Process.times[0]
@@stack = []
@@map = {}
@@array = []
set_trace_func PROFILE_PROC
end
def stop_profile
set_trace_func nil
end
def print_profile(f)
stop_profile
total = Process.times[0] - @@start
if total == 0 then total = 0.01 end
data = @@map.values + @@array
data = data.sort_by{|x| -x[2]}
sum = 0
f.printf " %% cumulative self self total\n"
f.printf " time seconds seconds calls ms/call ms/call name\n"
for d in data
sum += d[2]
f.printf "%6.2f %8.2f %8.2f %8d ", d[2]/total*100, sum, d[2], d[0]
f.printf "%8.2f %8.2f %s\n", d[2]*1000/d[0], d[1]*1000/d[0], get_name(*d[3])
end
f.printf "%6.2f %8.2f %8.2f %8d ", 0.0, total, 0.0, 1 # ???
f.printf "%8.2f %8.2f %s\n", 0.0, total*1000, "#toplevel" # ???
end
def get_name(klass, id)
name = klass.to_s || ""
if klass.kind_of? Class
name += "#"
else
name += "."
end
name + id.id2name
rescue NoMethodError => e
name = e.message.slice(/#<.*?:0x[0-9a-f]+>/) || ""
name + "." + id.id2name
end
private :get_name
end
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