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ruby / usr / share / ri / 2.2.0 / system / Benchmark / cdesc-Benchmark.ri
U:RDoc::NormalModule[iI"Benchmark:EF@0o:RDoc::Markup::Document:@parts[o;;[o:RDoc::Markup::Paragraph;[I"JThe Benchmark module provides methods to measure and report the time ;TI"used to execute Ruby code.;To:RDoc::Markup::BlankLineo:RDoc::Markup::List:
@type:BULLET:@items[o:RDoc::Markup::ListItem:@label0;[
o;	;[I"FMeasure the time to construct the string given by the expression ;TI"$<code>"a"*1_000_000_000</code>:;T@o:RDoc::Markup::Verbatim;[I"require 'benchmark'
;TI"
;TI"2puts Benchmark.measure { "a"*1_000_000_000 }
;T:@format0o;	;[I"=On my machine (OSX 10.8.3 on i5 1.7 Ghz) this generates:;T@o;;[I"10.350000   0.400000   0.750000 (  0.835234)
;T;0o;	;[I"FThis report shows the user CPU time, system CPU time, the sum of ;TI"Hthe user and system CPU times, and the elapsed real time. The unit ;TI"of time is seconds.;T@o;;0;[o;	;[I";Do some experiments sequentially using the #bm method:;T@o;;[
I"require 'benchmark'
;TI"
;TI"n = 5000000
;TI"Benchmark.bm do |x|
;TI"0  x.report { for i in 1..n; a = "1"; end }
;TI"0  x.report { n.times do   ; a = "1"; end }
;TI"0  x.report { 1.upto(n) do ; a = "1"; end }
;TI"	end
;T;0o;	;[I"The result:;T@o;;[	I"0    user     system      total        real
;TI"11.010000   0.000000   1.010000 (  1.014479)
;TI"11.000000   0.000000   1.000000 (  0.998261)
;TI"10.980000   0.000000   0.980000 (  0.981335)
;T;0o;;0;[o;	;[I"AContinuing the previous example, put a label in each report:;T@o;;[
I"require 'benchmark'
;TI"
;TI"n = 5000000
;TI"Benchmark.bm(7) do |x|
;TI":  x.report("for:")   { for i in 1..n; a = "1"; end }
;TI":  x.report("times:") { n.times do   ; a = "1"; end }
;TI":  x.report("upto:")  { 1.upto(n) do ; a = "1"; end }
;TI"	end
;T;0o;	;[I"The result:;T@o;;[	I":              user     system      total        real
;TI";for:      1.010000   0.000000   1.010000 (  1.015688)
;TI";times:    1.000000   0.000000   1.000000 (  1.003611)
;TI";upto:     1.030000   0.000000   1.030000 (  1.028098)
;T;0o;;;
;[o;;0;[o;	;[
I"FThe times for some benchmarks depend on the order in which items ;TI"?are run.  These differences are due to the cost of memory ;TI"Fallocation and garbage collection. To avoid these discrepancies, ;TI"Dthe #bmbm method is provided.  For example, to compare ways to ;TI"sort an array of floats:;T@o;;[
I"require 'benchmark'
;TI"
;TI"'array = (1..1000000).map { rand }
;TI"
;TI"Benchmark.bmbm do |x|
;TI"-  x.report("sort!") { array.dup.sort! }
;TI"-  x.report("sort")  { array.dup.sort  }
;TI"	end
;T;0o;	;[I"The result:;T@o;;[
I"9Rehearsal -----------------------------------------
;TI"9sort!   1.490000   0.010000   1.500000 (  1.490520)
;TI"9sort    1.460000   0.000000   1.460000 (  1.463025)
;TI"9-------------------------------- total: 2.960000sec
;TI"
;TI"8            user     system      total        real
;TI"9sort!   1.460000   0.000000   1.460000 (  1.460465)
;TI"9sort    1.450000   0.010000   1.460000 (  1.448327)
;T;0o;;0;[o;	;[I"EReport statistics of sequential experiments with unique labels, ;TI"!using the #benchmark method:;T@o;;[I"require 'benchmark'
;TI"Jinclude Benchmark         # we need the CAPTION and FORMAT constants
;TI"
;TI"n = 5000000
;TI"HBenchmark.benchmark(CAPTION, 7, FORMAT, ">total:", ">avg:") do |x|
;TI"?  tf = x.report("for:")   { for i in 1..n; a = "1"; end }
;TI"?  tt = x.report("times:") { n.times do   ; a = "1"; end }
;TI"?  tu = x.report("upto:")  { 1.upto(n) do ; a = "1"; end }
;TI"   [tf+tt+tu, (tf+tt+tu)/3]
;TI"	end
;T;0o;	;[I"The result:;T@o;;[I"9             user     system      total        real
;TI";for:      0.950000   0.000000   0.950000 (  0.952039)
;TI";times:    0.980000   0.000000   0.980000 (  0.984938)
;TI";upto:     0.950000   0.000000   0.950000 (  0.946787)
;TI";>total:   2.880000   0.000000   2.880000 (  2.883764)
;TI":>avg:     0.960000   0.000000   0.960000 (  0.961255);T;0:
@fileI"lib/benchmark.rb;T:0@omit_headings_from_table_of_contents_below0;0;0[[U:RDoc::Constant[iI"CAPTION;FI"Benchmark::CAPTION;F00o;;[o;	;[I"AThe default caption string (heading above the output times).;T;@;0@@cRDoc::NormalModule0U;[iI"FORMAT;FI"Benchmark::FORMAT;F00o;;[o;	;[I"VThe default format string used to display times.  See also Benchmark::Tms#format.;T;@;0@@@0[[[I"
class;T[[:public[
[I"benchmark;FI"lib/benchmark.rb;T[I"bm;F@²[I"	bmbm;F@²[I"measure;F@²[I"
realtime;F@²[:protected[[:private[[I"
instance;T[[;[[;[[;[
[@±@²[@´@²[@¶@²[@¸@²[@º@²[[U:RDoc::Context::Section[i0o;;[;0;0[@@cRDoc::TopLevel
gitshiva / ruby deb

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