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Microbenchmark showing the performance penalty of simply specifying a block capture i method arguments
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#!/usr/bin/env ruby | |
require 'benchmark' | |
N = 10_000_000 | |
def no_capture | |
end | |
def block_capture(&_block) | |
end | |
Benchmark.bmbm do |b| | |
b.report('nop') { N.times{ } } | |
b.report('no capture no block passed') { N.times{ no_capture } } | |
b.report('block capture no block passed') { N.times{ block_capture } } | |
b.report('no capture with block passed') { N.times{ no_capture {} } } | |
b.report('block capture with block passed') { N.times{ block_capture {} } } | |
end | |
__END__ | |
$ ./block_capture_penalty.rb | |
Rehearsal ------------------------------------------------------------------- | |
nop 0.430000 0.000000 0.430000 ( 0.433004) | |
no capture no block passed 0.690000 0.000000 0.690000 ( 0.696997) | |
block capture no block passed 0.850000 0.000000 0.850000 ( 0.845417) | |
no capture with block passed 0.760000 0.010000 0.770000 ( 0.762127) | |
block capture with block passed 5.230000 0.020000 5.250000 ( 5.268700) | |
---------------------------------------------------------- total: 7.990000sec | |
user system total real | |
nop 0.420000 0.000000 0.420000 ( 0.423946) | |
no capture no block passed 0.690000 0.000000 0.690000 ( 0.691389) | |
block capture no block passed 0.820000 0.000000 0.820000 ( 0.823047) | |
no capture with block passed 0.720000 0.000000 0.720000 ( 0.714247) | |
block capture with block passed 5.170000 0.020000 5.190000 ( 5.194559) | |
$ ruby -e 'def r(a,b); (a-0.42)/(b-0.42); end; puts r(0.820000,0.690000), r(5.170000,0.720000)' | |
1.4814814814814816 | |
15.833333333333334 | |
$ ruby -e 'puts RUBY_PLATFORM,RUBY_VERSION' | |
x86_64-darwin13 | |
2.2.0 |
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