зеркало из https://github.com/github/ruby.git
642 строки
16 KiB
Ruby
642 строки
16 KiB
Ruby
#
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# benchmark.rb
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#
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=begin
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= benchmark.rb
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== NAME
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((*benchmark.rb*)) - a benchmark utility
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== SYNOPSIS
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----------
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require "benchmark"
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include Benchmark
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----------
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== DESCRIPTION
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benchmark.rb provides some utilities to measure and report the
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times used and passed to execute.
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== SIMPLE EXAMPLE
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=== EXAMPLE 0
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To ((<measure>)) the times to make (({"a"*1_000_000})):
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----------
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puts measure{ "a"*1_000_000 }
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----------
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On my machine (FreeBSD 3.2 on P5100MHz) this reported as follows:
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----------
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1.166667 0.050000 1.216667 ( 0.571355)
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----------
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The above shows user time, system time, user+system, and really passed
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time. The unit of time is second.
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=== EXAMPLE 1
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To do some experiments sequentially, ((<bm>)) is useful:
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----------
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n = 50000
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bm do |x|
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x.report{for i in 1..n; a = "1"; end}
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x.report{n.times do ; a = "1"; end}
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x.report{1.upto(n) do ; a = "1"; end}
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end
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----------
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The result:
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----------
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user system total real
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1.033333 0.016667 1.016667 ( 0.492106)
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1.483333 0.000000 1.483333 ( 0.694605)
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1.516667 0.000000 1.516667 ( 0.711077)
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----------
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=== EXAMPLE 2
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To put a label in each ((<report>)):
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----------
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n = 50000
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bm(7) do |x|
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x.report("for:") {for i in 1..n; a = "1"; end}
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x.report("times:") {n.times do ; a = "1"; end}
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x.report("upto:") {1.upto(n) do ; a = "1"; end}
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end
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----------
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The option (({7})) specifies the offset of each report accoding to the
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longest label.
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This reports as follows:
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----------
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user system total real
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for: 1.050000 0.000000 1.050000 ( 0.503462)
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times: 1.533333 0.016667 1.550000 ( 0.735473)
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upto: 1.500000 0.016667 1.516667 ( 0.711239)
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----------
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=== EXAMPLE 3
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By the way, benchmarks might seem to depend on the order of items. It
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is caused by the cost of memory allocation and the garbage collection.
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To prevent this boresome, Benchmark::((<bmbm>)) is provided, e.g., to
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compare ways for sort array of strings:
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----------
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require "rbconfig"
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include Config
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def file
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open("%s/lib/ruby/%s.%s/tk.rb" %
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[CONFIG['prefix'],CONFIG['MAJOR'],CONFIG['MINOR']]).read
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end
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n = 10
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bmbm do |x|
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x.report("destructive!"){
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t = (file*n).to_a; t.each{|line| line.upcase!}; t.sort!
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}
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x.report("method chain"){
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t = (file*n).to_a.collect{|line| line.upcase}.sort
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}
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end
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----------
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This reports:
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----------
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Rehearsal ------------------------------------------------
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destructive! 2.664062 0.070312 2.734375 ( 2.783401)
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method chain 5.257812 0.156250 5.414062 ( 5.736088)
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--------------------------------------- total: 8.148438sec
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user system total real
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destructive! 2.359375 0.007812 2.367188 ( 2.381015)
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method chain 3.046875 0.023438 3.070312 ( 3.085816)
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----------
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=== EXAMPLE 4
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To report statistics of sequential experiments with unique label,
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((<benchmark>)) is available:
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----------
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n = 50000
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benchmark(" "*7 + CAPTION, 7, FMTSTR, ">total:", ">avg:") do |x|
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tf = x.report("for:") {for i in 1..n; a = "1"; end}
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tt = x.report("times:"){n.times do ; a = "1"; end}
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tu = x.report("upto:") {1.upto(n) do ; a = "1"; end}
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[tf+tt+tu, (tf+tt+tu)/3]
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end
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----------
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The result:
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----------
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user system total real
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for: 1.016667 0.016667 1.033333 ( 0.485749)
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times: 1.450000 0.016667 1.466667 ( 0.681367)
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upto: 1.533333 0.000000 1.533333 ( 0.722166)
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>total: 4.000000 0.033333 4.033333 ( 1.889282)
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>avg: 1.333333 0.011111 1.344444 ( 0.629761)
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----------
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== Benchmark module
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=== CONSTANT
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:CAPTION
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CAPTION is a caption string which is used in Benchmark::((<benchmark>)) and
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Benchmark::Report#((<report>)).
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:FMTSTR
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FMTSTR is a format string which is used in Benchmark::((<benchmark>)) and
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Benchmark::Report#((<report>)). See also Benchmark::Tms#((<format>)).
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:BENCHMARK_VERSION
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BENCHMARK_VERSION is version string which statnds for the last modification
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date (YYYY-MM-DD).
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=== INNER CLASS
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* ((<Benchmark::Job>))
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* ((<Benchmark::Report>))
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* ((<Benchmark::Tms>))
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=== MODULE FUNCTION
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==== benchmark
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----------
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benchmark([caption [, label_width [, fmtstr]]]) do |x| ... end
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benchmark([caption [, label_width [, fmtstr]]]) do array_of_Tms end
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benchmark([caption [, label_width [, fmtstr [, labels...]]]]) do
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...
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array_of_Tms
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end
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----------
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(({benchmark})) reports the times. In the first form the block variable x is
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treated as a ((<Benchmark::Report>)) object, which has ((<report>)) method.
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In the second form, each member of array_of_Tms is reported in the
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specified form if the member is a ((<Benchmark::Tms>)) object. The
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last form provides combined above two forms (See ((<EXAMPLE 3>))).
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The following lists the meaning of each option.
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:caption
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A string ((|caption|)) is printed once before execution of the given block.
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:label_width
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An integer ((|label_width|)) is used as an offset in each report.
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:fmtstr
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An string ((|fmtstr|)) is used to format each measurement.
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See ((<format>))
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:labels
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The rest parameters labels is used as prefix of the format to the
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value of block, that is array_of_Tms.
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==== bm
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----------
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bm([label_width [, labels ...]) do ... end
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----------
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(({bm})) is a simpler interface of ((<benchmark>)).
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(({bm})) acts as same as follows:
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benchmark(" "*label_width + CAPTION, label_width, FMTSTR, *labels) do
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...
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end
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==== bmbm
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----------
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bmbm([label_width]) do |x|
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x.item("label1") { .... }
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....
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end
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----------
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(({bmbm})) is yet another ((<benchmark>)). This utility function is
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provited to prevent a kind of job order dependency, which is caused
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by memory allocation and object creation. The usage is similar to
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((<bm>)) but has less options and does extra three things:
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(1) ((*Rehearsal*)): runs all items in the job ((<list>)) to allocate
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enough memory.
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(2) ((*GC*)): before each ((<measure>))ment, invokes (({GC.start})) to
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prevent the influence of previous job.
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(3) If given ((|label_width|)) is less than the maximal width of labels
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given as ((|item|))'s argument, the latter is used.
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Because (({bmbm})) is a 2-pass procedure, this is possible.
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(({bmbm})) returns an array which consists of Tms correspoding to each
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(({item})).
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==== measure
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----------
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measure([label]) do ... end
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----------
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measure returns the times used and passed to execute the given block as a
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Benchmark::Tms object.
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==== realtime
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----------
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realtime do ... end
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----------
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realtime returns the times passed to execute the given block.
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== Benchmark::Report
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=== CLASS METHOD
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==== Benchmark::Report::new(width)
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----------
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Benchmark::Report::new([width [, fmtstr]])
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----------
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Usually, one doesn't have to use this method directly,
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(({Benchmark::Report::new})) is called by ((<benchmark>)) or ((<bm>)).
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((|width|)) and ((|fmtstr|)) are the offset of ((|label|)) and
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format string responsively; Both of them are used in ((<format>)).
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=== METHOD
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==== report
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----------
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report(fmt, *args)
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----------
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This method reports label and time formated by ((|fmt|)). See
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((<format>)) of Benchmark::Tms for formatting rule.
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== Benchmark::Tms
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=== CLASS METHOD
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== Benchmark::Job
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=== CLASS METHOD
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==== Benchmark::Job::new
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----------
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Benchmark::Job::new(width)
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----------
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Usually, one doesn't have to use this method directly,
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(({Benchmark::Job::new})) is called by ((<bmbm>)).
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((|width|)) is a initial value for the offset ((|label|)) for formatting.
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((<bmbm>)) passes its argument ((|width|)) to this constructor.
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=== METHOD
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==== item
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----------
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item(((|lable|))){ .... }
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----------
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(({item})) registers a pair of (((|label|))) and given block as job ((<list>)).
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==== width
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Maximum length of labels in ((<list>)) plus one.
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==== list
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array of array which consists of label and jop proc.
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==== report
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alias to ((<item>)).
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==== Benchmark::Tms::new
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----------
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Benchmark::Tms::new([u [, s [, cu [, cs [, re [, l]]]]]])
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----------
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returns new Benchmark::Tms object which has
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((|u|)) as ((<utime>)),
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((|s|)) as ((<stime>)),
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((|cu|)) as ((<cutime>))
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((|cs|)) as ((<cstime>)),
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((|re|)) as ((<real>)) and
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((|l|)) as ((<label>)).
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The default value is assumed as 0.0 for ((|u|)), ((|s|)), ((|cu|)),
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((|cs|)) and ((|re|)). The default of ((|l|)) is null string ((({""}))).
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==== operator +
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----------
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tms1 + tms2
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----------
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returns a new Benchmark::Tms object as memberwise summation.
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This method and ((<(('operator /'))>)) is useful to take statistics.
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==== operator /
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----------
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tms / num
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----------
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returns a new Benchmark::Tms object as memberwise division by ((|num|)).
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This method and ((<operator +>)) is useful to take statistics.
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==== add
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----------
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add do ... end
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----------
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returns a new Benchmark::Tms object which is the result of additional
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execution which is given by block.
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==== add!
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----------
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add! do ... end
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----------
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do additional execution which is given by block.
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==== format
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----------
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format([fmtstr [, *args]])
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----------
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(({format})) returns formatted string of (({self})) according to a
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((|fmtstr|)) like (({Kernel::format})). In addition, (({format})) accepts
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some extentions as follows:
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:%u
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((<utime>)).
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:%y
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((<stime>)). (Mnemonic: y of ``s((*y*))stem'')
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:%U
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((<cutime>)).
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:%Y
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((<cstime>)).
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:%t
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((<total>)).
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:%r
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((<real>)).
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:%n
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((<label>)). (Mnemonic: n of ``((*n*))ame'')
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If fmtstr is not given ((<FMTSTR>)) is used as default value.
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==== utime
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returns user time.
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==== stime
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returns system time.
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==== cutime
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returns user time of children.
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==== cstime
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returns system time of children.
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==== total
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returns total time, that is
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((<utime>)) + ((<stime>)) + ((<cutime>)) + ((<cstime>)).
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==== real
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returns really passed time.
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==== label
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returns label.
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==== to_a
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returns a new array as follows
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[label, utime, stime, cutime, cstime, real]
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==== to_s
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same as (({format()})). See also ((<format>)).
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== HISTORY
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A benchmark.rb appeared in RAA January 1st 2000.
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== AUTHOR
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Gotoken (gotoken@notwork.org).
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=end
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module Benchmark
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BENCHMARK_VERSION = "2002-04-25"
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def Benchmark::times()
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Process::times()
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end
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def benchmark(caption = "", label_width = nil, fmtstr = nil, *labels)
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sync = STDOUT.sync
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STDOUT.sync = true
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label_width ||= 0
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fmtstr ||= FMTSTR
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raise ArgumentError, "no block" unless iterator?
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print caption
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results = yield(Report.new(label_width, fmtstr))
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Array === results and results.grep(Tms).each {|t|
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print((labels.shift || t.label || "").ljust(label_width),
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t.format(fmtstr))
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}
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STDOUT.sync = sync
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end
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def bm(label_width = 0, *labels)
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benchmark(" "*label_width + CAPTION, label_width, FMTSTR, *labels){|*x|yield(*x)}
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end
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def bmbm(width = 0)
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job = Job.new(width)
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yield(job)
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width = job.width
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sync = STDOUT.sync
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STDOUT.sync = true
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# rehearsal
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print "Rehearsal "
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puts '-'*(width+CAPTION.length - "Rehearsal ".length)
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list = []
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job.list.each{|label,item|
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print(label.ljust(width))
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res = Benchmark::measure(&item)
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print res.format()
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list.push res
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}
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sum = Tms.new; list.each{|i| sum += i}
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ets = sum.format("total: %tsec")
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printf("%s %s\n\n",
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"-"*(width+CAPTION.length-ets.length-1), ets)
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# take
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print ' '*width, CAPTION
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list = []
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ary = []
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job.list.each{|label,item|
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GC::start
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print label.ljust(width)
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res = Benchmark::measure(&item)
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print res.format()
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ary.push res
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list.push [label, res]
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}
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STDOUT.sync = sync
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ary
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end
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def measure(label = "")
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t0, r0 = Benchmark.times, Time.now
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yield
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t1, r1 = Benchmark.times, Time.now
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Benchmark::Tms.new(t1.utime - t0.utime,
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t1.stime - t0.stime,
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t1.cutime - t0.cutime,
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t1.cstime - t0.cstime,
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r1.to_f - r0.to_f,
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label)
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end
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def realtime(&blk)
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Benchmark::measure(&blk).real
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end
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class Job
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def initialize(width)
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@width = width
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@list = []
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end
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def item(label = "", &blk)
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raise ArgmentError, "no block" unless block_given?
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label.concat ' '
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w = label.length
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@width = w if @width < w
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@list.push [label, blk]
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self
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end
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alias report item
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attr_reader :list, :width
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end
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module_function :benchmark, :measure, :realtime, :bm, :bmbm
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class Report
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def initialize(width = 0, fmtstr = nil)
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@width, @fmtstr = width, fmtstr
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end
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def item(label = "", *fmt, &blk)
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print label.ljust(@width)
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res = Benchmark::measure(&blk)
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print res.format(@fmtstr, *fmt)
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res
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end
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alias report item
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end
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class Tms
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CAPTION = " user system total real\n"
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FMTSTR = "%10.6u %10.6y %10.6t %10.6r\n"
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attr_reader :utime, :stime, :cutime, :cstime, :real, :total, :label
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def initialize(u = 0.0, s = 0.0, cu = 0.0, cs = 0.0, real = 0.0, l = nil)
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@utime, @stime, @cutime, @cstime, @real, @label = u, s, cu, cs, real, l
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@total = @utime + @stime + @cutime + @cstime
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end
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def add(&blk)
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self + Benchmark::measure(&blk)
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end
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def add!
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t = Benchmark::measure(&blk)
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@utime = utime + t.utime
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@stime = stime + t.stime
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@cutime = cutime + t.cutime
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@cstime = cstime + t.cstime
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@real = real + t.real
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self
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end
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def +(x); memberwise(:+, x) end
|
|
def -(x); memberwise(:-, x) end
|
|
def *(x); memberwise(:*, x) end
|
|
def /(x); memberwise(:/, x) end
|
|
|
|
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
|
|
|
|
def to_s
|
|
format
|
|
end
|
|
|
|
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
|
|
|
|
CAPTION = Benchmark::Tms::CAPTION
|
|
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
|