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Benchmark
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Editing: cdesc-Benchmark.yaml
--- !ruby/object:RI::ClassDescription attributes: [] class_methods: [] comment: - !ruby/struct:SM::Flow::P body: The Benchmark module provides methods to measure and report the time used to execute Ruby code. - !ruby/object:SM::Flow::LIST contents: - !ruby/struct:SM::Flow::LI label: "*" body: "Measure the time to construct the string given by the expression <tt>"a"*1_000_000</tt>:" - !ruby/struct:SM::Flow::VERB body: " require 'benchmark'\n\n puts Benchmark.measure { "a"*1_000_000 }\n" - !ruby/struct:SM::Flow::P body: "On my machine (FreeBSD 3.2 on P5, 100MHz) this generates:" - !ruby/struct:SM::Flow::VERB body: " 1.166667 0.050000 1.216667 ( 0.571355)\n" - !ruby/struct:SM::Flow::P body: 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. - !ruby/struct:SM::Flow::LI label: "*" body: "Do some experiments sequentially using the #bm method:" - !ruby/struct:SM::Flow::VERB body: " require 'benchmark'\n\n n = 50000\n Benchmark.bm do |x|\n x.report { for i in 1..n; a = "1"; end }\n x.report { n.times do ; a = "1"; end }\n x.report { 1.upto(n) do ; a = "1"; end }\n end\n" - !ruby/struct:SM::Flow::P body: "The result:" - !ruby/struct:SM::Flow::VERB body: " user system total real\n 1.033333 0.016667 1.016667 ( 0.492106)\n 1.483333 0.000000 1.483333 ( 0.694605)\n 1.516667 0.000000 1.516667 ( 0.711077)\n" - !ruby/struct:SM::Flow::LI label: "*" body: "Continuing the previous example, put a label in each report:" - !ruby/struct:SM::Flow::VERB body: " require 'benchmark'\n\n n = 50000\n Benchmark.bm(7) do |x|\n x.report("for:") { for i in 1..n; a = "1"; end }\n x.report("times:") { n.times do ; a = "1"; end }\n x.report("upto:") { 1.upto(n) do ; a = "1"; end }\n end\n" type: :BULLET - !ruby/struct:SM::Flow::P body: "The result:" - !ruby/struct:SM::Flow::VERB body: " user system total real\n for: 1.050000 0.000000 1.050000 ( 0.503462)\n times: 1.533333 0.016667 1.550000 ( 0.735473)\n upto: 1.500000 0.016667 1.516667 ( 0.711239)\n" - !ruby/object:SM::Flow::LIST contents: - !ruby/struct:SM::Flow::LI label: "*" body: "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:" - !ruby/struct:SM::Flow::VERB body: " require 'benchmark'\n\n array = (1..1000000).map { rand }\n\n Benchmark.bmbm do |x|\n x.report("sort!") { array.dup.sort! }\n x.report("sort") { array.dup.sort }\n end\n" - !ruby/struct:SM::Flow::P body: "The result:" - !ruby/struct:SM::Flow::VERB body: " Rehearsal -----------------------------------------\n sort! 11.928000 0.010000 11.938000 ( 12.756000)\n sort 13.048000 0.020000 13.068000 ( 13.857000)\n ------------------------------- total: 25.006000sec\n\n user system total real\n sort! 12.959000 0.010000 12.969000 ( 13.793000)\n sort 12.007000 0.000000 12.007000 ( 12.791000)\n" - !ruby/struct:SM::Flow::LI label: "*" body: "Report statistics of sequential experiments with unique labels, using the #benchmark method:" - !ruby/struct:SM::Flow::VERB body: " require 'benchmark'\n\n n = 50000\n Benchmark.benchmark(" "*7 + CAPTION, 7, FMTSTR, ">total:", ">avg:") do |x|\n tf = x.report("for:") { for i in 1..n; a = "1"; end }\n tt = x.report("times:") { n.times do ; a = "1"; end }\n tu = x.report("upto:") { 1.upto(n) do ; a = "1"; end }\n [tf+tt+tu, (tf+tt+tu)/3]\n end\n" - !ruby/struct:SM::Flow::P body: "The result:" - !ruby/struct:SM::Flow::VERB body: " user system total real\n for: 1.016667 0.016667 1.033333 ( 0.485749)\n times: 1.450000 0.016667 1.466667 ( 0.681367)\n upto: 1.533333 0.000000 1.533333 ( 0.722166)\n >total: 4.000000 0.033333 4.033333 ( 1.889282)\n >avg: 1.333333 0.011111 1.344444 ( 0.629761)\n" type: :BULLET constants: - !ruby/object:RI::Constant comment: name: BENCHMARK_VERSION value: "\"2002-04-25\"" - !ruby/object:RI::Constant comment: - !ruby/struct:SM::Flow::P body: The default caption string (heading above the output times). name: CAPTION value: Benchmark::Tms::CAPTION - !ruby/object:RI::Constant comment: - !ruby/struct:SM::Flow::P body: The default format string used to display times. See also Benchmark::Tms#format. name: FMTSTR value: Benchmark::Tms::FMTSTR full_name: Benchmark includes: [] instance_methods: - !ruby/object:RI::MethodSummary name: benchmark - !ruby/object:RI::MethodSummary name: bm - !ruby/object:RI::MethodSummary name: bmbm - !ruby/object:RI::MethodSummary name: measure - !ruby/object:RI::MethodSummary name: realtime name: Benchmark superclass:
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