зеркало из https://github.com/github/ruby.git
573 строки
18 KiB
Ruby
573 строки
18 KiB
Ruby
=begin
|
|
#
|
|
# benchmark.rb - a performance benchmarking library
|
|
#
|
|
# $Id$
|
|
#
|
|
# Created by Gotoken (gotoken@notwork.org).
|
|
#
|
|
# Documentation by Gotoken (original RD), Lyle Johnson (RDoc conversion), and
|
|
# Gavin Sinclair (editing).
|
|
#
|
|
=end
|
|
|
|
# == Overview
|
|
#
|
|
# The Benchmark module provides methods for benchmarking Ruby code, giving
|
|
# detailed reports on the time taken for each task.
|
|
#
|
|
|
|
# The Benchmark module provides methods to measure and report the time
|
|
# used to execute Ruby code.
|
|
#
|
|
# * Measure the time to construct the string given by the expression
|
|
# <tt>"a"*1_000_000</tt>:
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# puts Benchmark.measure { "a"*1_000_000 }
|
|
#
|
|
# On my machine (FreeBSD 3.2 on P5, 100MHz) this generates:
|
|
#
|
|
# 1.166667 0.050000 1.216667 ( 0.571355)
|
|
#
|
|
# This report shows the user CPU time, system CPU time, the sum of
|
|
# the user and system CPU times, and the elapsed real time. The unit
|
|
# of time is seconds.
|
|
#
|
|
# * Do some experiments sequentially using the #bm method:
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# n = 50000
|
|
# Benchmark.bm do |x|
|
|
# x.report { for i in 1..n; a = "1"; end }
|
|
# x.report { n.times do ; a = "1"; end }
|
|
# x.report { 1.upto(n) do ; a = "1"; end }
|
|
# end
|
|
#
|
|
# The result:
|
|
#
|
|
# user system total real
|
|
# 1.033333 0.016667 1.016667 ( 0.492106)
|
|
# 1.483333 0.000000 1.483333 ( 0.694605)
|
|
# 1.516667 0.000000 1.516667 ( 0.711077)
|
|
#
|
|
# * Continuing the previous example, put a label in each report:
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# n = 50000
|
|
# Benchmark.bm(7) do |x|
|
|
# x.report("for:") { for i in 1..n; a = "1"; end }
|
|
# x.report("times:") { n.times do ; a = "1"; end }
|
|
# x.report("upto:") { 1.upto(n) do ; a = "1"; end }
|
|
# end
|
|
#
|
|
# The result:
|
|
#
|
|
# user system total real
|
|
# for: 1.050000 0.000000 1.050000 ( 0.503462)
|
|
# times: 1.533333 0.016667 1.550000 ( 0.735473)
|
|
# upto: 1.500000 0.016667 1.516667 ( 0.711239)
|
|
#
|
|
#
|
|
# * The times for some benchmarks depend on the order in which items
|
|
# are run. These differences are due to the cost of memory
|
|
# allocation and garbage collection. To avoid these discrepancies,
|
|
# the #bmbm method is provided. For example, to compare ways to
|
|
# sort an array of floats:
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# array = (1..1000000).map { rand }
|
|
#
|
|
# Benchmark.bmbm do |x|
|
|
# x.report("sort!") { array.dup.sort! }
|
|
# x.report("sort") { array.dup.sort }
|
|
# end
|
|
#
|
|
# The result:
|
|
#
|
|
# Rehearsal -----------------------------------------
|
|
# sort! 11.928000 0.010000 11.938000 ( 12.756000)
|
|
# sort 13.048000 0.020000 13.068000 ( 13.857000)
|
|
# ------------------------------- total: 25.006000sec
|
|
#
|
|
# user system total real
|
|
# sort! 12.959000 0.010000 12.969000 ( 13.793000)
|
|
# sort 12.007000 0.000000 12.007000 ( 12.791000)
|
|
#
|
|
#
|
|
# * Report statistics of sequential experiments with unique labels,
|
|
# using the #benchmark method:
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# n = 50000
|
|
# Benchmark.benchmark(" "*7 + CAPTION, 7, FMTSTR, ">total:", ">avg:") do |x|
|
|
# tf = x.report("for:") { for i in 1..n; a = "1"; end }
|
|
# tt = x.report("times:") { n.times do ; a = "1"; end }
|
|
# tu = x.report("upto:") { 1.upto(n) do ; a = "1"; end }
|
|
# [tf+tt+tu, (tf+tt+tu)/3]
|
|
# end
|
|
#
|
|
# The result:
|
|
#
|
|
# user system total real
|
|
# for: 1.016667 0.016667 1.033333 ( 0.485749)
|
|
# times: 1.450000 0.016667 1.466667 ( 0.681367)
|
|
# upto: 1.533333 0.000000 1.533333 ( 0.722166)
|
|
# >total: 4.000000 0.033333 4.033333 ( 1.889282)
|
|
# >avg: 1.333333 0.011111 1.344444 ( 0.629761)
|
|
|
|
module Benchmark
|
|
|
|
BENCHMARK_VERSION = "2002-04-25" #:nodoc"
|
|
|
|
def Benchmark::times() # :nodoc:
|
|
Process::times()
|
|
end
|
|
|
|
|
|
# Invokes the block with a <tt>Benchmark::Report</tt> object, which
|
|
# may be used to collect and report on the results of individual
|
|
# benchmark tests. Reserves <i>label_width</i> leading spaces for
|
|
# labels on each line. Prints _caption_ at the top of the
|
|
# report, and uses _fmt_ to format each line.
|
|
# If the block returns an array of
|
|
# <tt>Benchmark::Tms</tt> objects, these will be used to format
|
|
# additional lines of output. If _label_ parameters are
|
|
# given, these are used to label these extra lines.
|
|
#
|
|
# _Note_: Other methods provide a simpler interface to this one, and are
|
|
# suitable for nearly all benchmarking requirements. See the examples in
|
|
# Benchmark, and the #bm and #bmbm methods.
|
|
#
|
|
# Example:
|
|
#
|
|
# require 'benchmark'
|
|
# include Benchmark # we need the CAPTION and FMTSTR constants
|
|
#
|
|
# n = 50000
|
|
# Benchmark.benchmark(" "*7 + CAPTION, 7, FMTSTR, ">total:", ">avg:") do |x|
|
|
# tf = x.report("for:") { for i in 1..n; a = "1"; end }
|
|
# tt = x.report("times:") { n.times do ; a = "1"; end }
|
|
# tu = x.report("upto:") { 1.upto(n) do ; a = "1"; end }
|
|
# [tf+tt+tu, (tf+tt+tu)/3]
|
|
# end
|
|
#
|
|
# <i>Generates:</i>
|
|
#
|
|
# user system total real
|
|
# for: 1.016667 0.016667 1.033333 ( 0.485749)
|
|
# times: 1.450000 0.016667 1.466667 ( 0.681367)
|
|
# upto: 1.533333 0.000000 1.533333 ( 0.722166)
|
|
# >total: 4.000000 0.033333 4.033333 ( 1.889282)
|
|
# >avg: 1.333333 0.011111 1.344444 ( 0.629761)
|
|
#
|
|
|
|
def benchmark(caption = "", label_width = nil, fmtstr = nil, *labels) # :yield: report
|
|
sync = STDOUT.sync
|
|
STDOUT.sync = true
|
|
label_width ||= 0
|
|
fmtstr ||= FMTSTR
|
|
raise ArgumentError, "no block" unless iterator?
|
|
print caption
|
|
results = yield(Report.new(label_width, fmtstr))
|
|
Array === results and results.grep(Tms).each {|t|
|
|
print((labels.shift || t.label || "").ljust(label_width),
|
|
t.format(fmtstr))
|
|
}
|
|
STDOUT.sync = sync
|
|
end
|
|
|
|
|
|
# A simple interface to the #benchmark method, #bm is generates sequential reports
|
|
# with labels. The parameters have the same meaning as for #benchmark.
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# n = 50000
|
|
# Benchmark.bm(7) do |x|
|
|
# x.report("for:") { for i in 1..n; a = "1"; end }
|
|
# x.report("times:") { n.times do ; a = "1"; end }
|
|
# x.report("upto:") { 1.upto(n) do ; a = "1"; end }
|
|
# end
|
|
#
|
|
# <i>Generates:</i>
|
|
#
|
|
# user system total real
|
|
# for: 1.050000 0.000000 1.050000 ( 0.503462)
|
|
# times: 1.533333 0.016667 1.550000 ( 0.735473)
|
|
# upto: 1.500000 0.016667 1.516667 ( 0.711239)
|
|
#
|
|
|
|
def bm(label_width = 0, *labels, &blk) # :yield: report
|
|
benchmark(" "*label_width + CAPTION, label_width, FMTSTR, *labels, &blk)
|
|
end
|
|
|
|
|
|
# Sometimes benchmark results are skewed because code executed
|
|
# earlier encounters different garbage collection overheads than
|
|
# that run later. #bmbm attempts to minimize this effect by running
|
|
# the tests twice, the first time as a rehearsal in order to get the
|
|
# runtime environment stable, the second time for
|
|
# real. <tt>GC.start</tt> is executed before the start of each of
|
|
# the real timings; the cost of this is not included in the
|
|
# timings. In reality, though, there's only so much that #bmbm can
|
|
# do, and the results are not guaranteed to be isolated from garbage
|
|
# collection and other effects.
|
|
#
|
|
# Because #bmbm takes two passes through the tests, it can
|
|
# calculate the required label width.
|
|
#
|
|
# require 'benchmark'
|
|
#
|
|
# array = (1..1000000).map { rand }
|
|
#
|
|
# Benchmark.bmbm do |x|
|
|
# x.report("sort!") { array.dup.sort! }
|
|
# x.report("sort") { array.dup.sort }
|
|
# end
|
|
#
|
|
# <i>Generates:</i>
|
|
#
|
|
# Rehearsal -----------------------------------------
|
|
# sort! 11.928000 0.010000 11.938000 ( 12.756000)
|
|
# sort 13.048000 0.020000 13.068000 ( 13.857000)
|
|
# ------------------------------- total: 25.006000sec
|
|
#
|
|
# user system total real
|
|
# sort! 12.959000 0.010000 12.969000 ( 13.793000)
|
|
# sort 12.007000 0.000000 12.007000 ( 12.791000)
|
|
#
|
|
# #bmbm yields a Benchmark::Job object and returns an array of
|
|
# Benchmark::Tms objects.
|
|
#
|
|
def bmbm(width = 0, &blk) # :yield: job
|
|
job = Job.new(width)
|
|
yield(job)
|
|
width = job.width
|
|
sync = STDOUT.sync
|
|
STDOUT.sync = true
|
|
|
|
# rehearsal
|
|
print "Rehearsal "
|
|
puts '-'*(width+CAPTION.length - "Rehearsal ".length)
|
|
list = []
|
|
job.list.each{|label,item|
|
|
print(label.ljust(width))
|
|
res = Benchmark::measure(&item)
|
|
print res.format()
|
|
list.push res
|
|
}
|
|
sum = Tms.new; list.each{|i| sum += i}
|
|
ets = sum.format("total: %tsec")
|
|
printf("%s %s\n\n",
|
|
"-"*(width+CAPTION.length-ets.length-1), ets)
|
|
|
|
# take
|
|
print ' '*width, CAPTION
|
|
list = []
|
|
ary = []
|
|
job.list.each{|label,item|
|
|
GC::start
|
|
print label.ljust(width)
|
|
res = Benchmark::measure(&item)
|
|
print res.format()
|
|
ary.push res
|
|
list.push [label, res]
|
|
}
|
|
|
|
STDOUT.sync = sync
|
|
ary
|
|
end
|
|
|
|
#
|
|
# Returns the time used to execute the given block as a
|
|
# Benchmark::Tms object.
|
|
#
|
|
def measure(label = "") # :yield:
|
|
t0, r0 = Benchmark.times, Time.now
|
|
yield
|
|
t1, r1 = Benchmark.times, Time.now
|
|
Benchmark::Tms.new(t1.utime - t0.utime,
|
|
t1.stime - t0.stime,
|
|
t1.cutime - t0.cutime,
|
|
t1.cstime - t0.cstime,
|
|
r1.to_f - r0.to_f,
|
|
label)
|
|
end
|
|
|
|
#
|
|
# Returns the elapsed real time used to execute the given block.
|
|
#
|
|
def realtime(&blk) # :yield:
|
|
r0 = Time.now
|
|
yield
|
|
r1 = Time.now
|
|
r1.to_f - r0.to_f
|
|
end
|
|
|
|
|
|
|
|
#
|
|
# A Job is a sequence of labelled blocks to be processed by the
|
|
# Benchmark.bmbm method. It is of little direct interest to the user.
|
|
#
|
|
class Job # :nodoc:
|
|
#
|
|
# Returns an initialized Job instance.
|
|
# Usually, one doesn't call this method directly, as new
|
|
# Job objects are created by the #bmbm method.
|
|
# _width_ is a initial value for the label offset used in formatting;
|
|
# the #bmbm method passes its _width_ argument to this constructor.
|
|
#
|
|
def initialize(width)
|
|
@width = width
|
|
@list = []
|
|
end
|
|
|
|
#
|
|
# Registers the given label and block pair in the job list.
|
|
#
|
|
def item(label = "", &blk) # :yield:
|
|
raise ArgumentError, "no block" unless block_given?
|
|
label += ' '
|
|
w = label.length
|
|
@width = w if @width < w
|
|
@list.push [label, blk]
|
|
self
|
|
end
|
|
|
|
alias report item
|
|
|
|
# An array of 2-element arrays, consisting of label and block pairs.
|
|
attr_reader :list
|
|
|
|
# Length of the widest label in the #list, plus one.
|
|
attr_reader :width
|
|
end
|
|
|
|
module_function :benchmark, :measure, :realtime, :bm, :bmbm
|
|
|
|
|
|
|
|
#
|
|
# This class is used by the Benchmark.benchmark and Benchmark.bm methods.
|
|
# It is of little direct interest to the user.
|
|
#
|
|
class Report # :nodoc:
|
|
#
|
|
# Returns an initialized Report instance.
|
|
# Usually, one doesn't call this method directly, as new
|
|
# Report objects are created by the #benchmark and #bm methods.
|
|
# _width_ and _fmtstr_ are the label offset and
|
|
# format string used by Tms#format.
|
|
#
|
|
def initialize(width = 0, fmtstr = nil)
|
|
@width, @fmtstr = width, fmtstr
|
|
end
|
|
|
|
#
|
|
# Prints the _label_ and measured time for the block,
|
|
# formatted by _fmt_. See Tms#format for the
|
|
# formatting rules.
|
|
#
|
|
def item(label = "", *fmt, &blk) # :yield:
|
|
print label.ljust(@width)
|
|
res = Benchmark::measure(&blk)
|
|
print res.format(@fmtstr, *fmt)
|
|
res
|
|
end
|
|
|
|
alias report item
|
|
end
|
|
|
|
|
|
|
|
#
|
|
# A data object, representing the times associated with a benchmark
|
|
# measurement.
|
|
#
|
|
class Tms
|
|
CAPTION = " user system total real\n"
|
|
FMTSTR = "%10.6u %10.6y %10.6t %10.6r\n"
|
|
|
|
# User CPU time
|
|
attr_reader :utime
|
|
|
|
# System CPU time
|
|
attr_reader :stime
|
|
|
|
# User CPU time of children
|
|
attr_reader :cutime
|
|
|
|
# System CPU time of children
|
|
attr_reader :cstime
|
|
|
|
# Elapsed real time
|
|
attr_reader :real
|
|
|
|
# Total time, that is _utime_ + _stime_ + _cutime_ + _cstime_
|
|
attr_reader :total
|
|
|
|
# Label
|
|
attr_reader :label
|
|
|
|
#
|
|
# Returns an initialized Tms object which has
|
|
# _u_ as the user CPU time, _s_ as the system CPU time,
|
|
# _cu_ as the children's user CPU time, _cs_ as the children's
|
|
# system CPU time, _real_ as the elapsed real time and _l_
|
|
# as the label.
|
|
#
|
|
def initialize(u = 0.0, s = 0.0, cu = 0.0, cs = 0.0, real = 0.0, l = nil)
|
|
@utime, @stime, @cutime, @cstime, @real, @label = u, s, cu, cs, real, l
|
|
@total = @utime + @stime + @cutime + @cstime
|
|
end
|
|
|
|
#
|
|
# Returns a new Tms object whose times are the sum of the times for this
|
|
# Tms object, plus the time required to execute the code block (_blk_).
|
|
#
|
|
def add(&blk) # :yield:
|
|
self + Benchmark::measure(&blk)
|
|
end
|
|
|
|
#
|
|
# An in-place version of #add.
|
|
#
|
|
def add!
|
|
t = Benchmark::measure(&blk)
|
|
@utime = utime + t.utime
|
|
@stime = stime + t.stime
|
|
@cutime = cutime + t.cutime
|
|
@cstime = cstime + t.cstime
|
|
@real = real + t.real
|
|
self
|
|
end
|
|
|
|
#
|
|
# Returns a new Tms object obtained by memberwise summation
|
|
# of the individual times for this Tms object with those of the other
|
|
# Tms object.
|
|
# This method and #/() are useful for taking statistics.
|
|
#
|
|
def +(other); memberwise(:+, other) end
|
|
|
|
#
|
|
# Returns a new Tms object obtained by memberwise subtraction
|
|
# of the individual times for the other Tms object from those of this
|
|
# Tms object.
|
|
#
|
|
def -(other); memberwise(:-, other) end
|
|
|
|
#
|
|
# Returns a new Tms object obtained by memberwise multiplication
|
|
# of the individual times for this Tms object by _x_.
|
|
#
|
|
def *(x); memberwise(:*, x) end
|
|
|
|
#
|
|
# Returns a new Tms object obtained by memberwise division
|
|
# of the individual times for this Tms object by _x_.
|
|
# This method and #+() are useful for taking statistics.
|
|
#
|
|
def /(x); memberwise(:/, x) end
|
|
|
|
#
|
|
# Returns the contents of this Tms object as
|
|
# a formatted string, according to a format string
|
|
# like that passed to Kernel.format. In addition, #format
|
|
# accepts the following extensions:
|
|
#
|
|
# <tt>%u</tt>:: Replaced by the user CPU time, as reported by Tms#utime.
|
|
# <tt>%y</tt>:: Replaced by the system CPU time, as reported by #stime (Mnemonic: y of "s*y*stem")
|
|
# <tt>%U</tt>:: Replaced by the children's user CPU time, as reported by Tms#cutime
|
|
# <tt>%Y</tt>:: Replaced by the children's system CPU time, as reported by Tms#cstime
|
|
# <tt>%t</tt>:: Replaced by the total CPU time, as reported by Tms#total
|
|
# <tt>%r</tt>:: Replaced by the elapsed real time, as reported by Tms#real
|
|
# <tt>%n</tt>:: Replaced by the label string, as reported by Tms#label (Mnemonic: n of "*n*ame")
|
|
#
|
|
# If _fmtstr_ is not given, FMTSTR is used as default value, detailing the
|
|
# user, system and real elapsed time.
|
|
#
|
|
def format(arg0 = nil, *args)
|
|
fmtstr = (arg0 || FMTSTR).dup
|
|
fmtstr.gsub!(/(%[-+\.\d]*)n/){"#{$1}s" % label}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)u/){"#{$1}f" % utime}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)y/){"#{$1}f" % stime}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)U/){"#{$1}f" % cutime}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)Y/){"#{$1}f" % cstime}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)t/){"#{$1}f" % total}
|
|
fmtstr.gsub!(/(%[-+\.\d]*)r/){"(#{$1}f)" % real}
|
|
arg0 ? Kernel::format(fmtstr, *args) : fmtstr
|
|
end
|
|
|
|
#
|
|
# Same as #format.
|
|
#
|
|
def to_s
|
|
format
|
|
end
|
|
|
|
#
|
|
# Returns a new 6-element array, consisting of the
|
|
# label, user CPU time, system CPU time, children's
|
|
# user CPU time, children's system CPU time and elapsed
|
|
# real time.
|
|
#
|
|
def to_a
|
|
[@label, @utime, @stime, @cutime, @cstime, @real]
|
|
end
|
|
|
|
protected
|
|
def memberwise(op, x)
|
|
case x
|
|
when Benchmark::Tms
|
|
Benchmark::Tms.new(utime.__send__(op, x.utime),
|
|
stime.__send__(op, x.stime),
|
|
cutime.__send__(op, x.cutime),
|
|
cstime.__send__(op, x.cstime),
|
|
real.__send__(op, x.real)
|
|
)
|
|
else
|
|
Benchmark::Tms.new(utime.__send__(op, x),
|
|
stime.__send__(op, x),
|
|
cutime.__send__(op, x),
|
|
cstime.__send__(op, x),
|
|
real.__send__(op, x)
|
|
)
|
|
end
|
|
end
|
|
end
|
|
|
|
# The default caption string (heading above the output times).
|
|
CAPTION = Benchmark::Tms::CAPTION
|
|
|
|
# The default format string used to display times. See also Benchmark::Tms#format.
|
|
FMTSTR = Benchmark::Tms::FMTSTR
|
|
end
|
|
|
|
if __FILE__ == $0
|
|
include Benchmark
|
|
|
|
n = ARGV[0].to_i.nonzero? || 50000
|
|
puts %Q([#{n} times iterations of `a = "1"'])
|
|
benchmark(" " + CAPTION, 7, FMTSTR) do |x|
|
|
x.report("for:") {for i in 1..n; a = "1"; end} # Benchmark::measure
|
|
x.report("times:") {n.times do ; a = "1"; end}
|
|
x.report("upto:") {1.upto(n) do ; a = "1"; end}
|
|
end
|
|
|
|
benchmark do
|
|
[
|
|
measure{for i in 1..n; a = "1"; end}, # Benchmark::measure
|
|
measure{n.times do ; a = "1"; end},
|
|
measure{1.upto(n) do ; a = "1"; end}
|
|
]
|
|
end
|
|
end
|