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Interpolate '' instead of nil when multiple is false. #32302
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dillonwelch
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I think it'd be fine to use an inline ternary here to save adding an extra method, e.g: "#{sanitized_method_name}#{multiple ? '[]' : ''}" it's also shorter than the method call. |
"my string #{nil}" results in an additional '' string allocation, I'm guessing because the nil has to be converted to a string. "my string #{'[]' if multiple}" results in "my string #{nil}" if multiple is false. Doing "my string #{''}" does not result in an extra string allocation. I moved the if multiple logic into a method so I only had to make the change once. ```ruby begin require "bundler/inline" rescue LoadError => e $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler" raise e end gemfile(true) do source "https://rubygems.org" gem "benchmark-ips" gem "rails" end def allocate_count GC.disable before = ObjectSpace.count_objects yield after = ObjectSpace.count_objects after.each { |k,v| after[k] = v - before[k] } after[:T_HASH] -= 1 # probe effect - we created the before hash. GC.enable result = after.reject { |k,v| v == 0 } GC.start result end @html_options = {} def master_version(multiple=nil) "hi#{"[]" if multiple}" end def fast_version(multiple=nil) str = multiple ? "[]" : '' "hi#{str}" end def test puts "master_version" puts allocate_count { 1000.times { master_version } } puts "master_version with arg" puts allocate_count { 1000.times { master_version(' there') } } puts "fast_version" puts allocate_count { 1000.times { fast_version } } puts "fast_version with arg" puts allocate_count { 1000.times { fast_version(' there') } } Benchmark.ips do |x| x.report("master_version") { master_version } x.report("master_version with arg") { master_version(' there') } x.report("fast_version") { fast_version } x.report("fast_version with arg") { fast_version(' there') } x.compare! end end test ``` results: ```ruby master_version {:FREE=>-1981, :T_STRING=>2052} master_version with arg {:FREE=>-1001, :T_STRING=>1000} fast_version {:FREE=>-1001, :T_STRING=>1000} fast_version with arg {:FREE=>-1001, :T_STRING=>1000} Warming up -------------------------------------- master_version 138.851k i/100ms master_version with arg 164.029k i/100ms fast_version 165.737k i/100ms fast_version with arg 167.016k i/100ms Calculating ------------------------------------- master_version 2.464M (±14.7%) i/s - 11.941M in 5.023307s master_version with arg 3.754M (± 8.5%) i/s - 18.699M in 5.021354s fast_version 3.449M (±11.7%) i/s - 17.071M in 5.033312s fast_version with arg 3.636M (± 6.9%) i/s - 18.205M in 5.034792s Comparison: master_version with arg: 3753896.1 i/s fast_version with arg: 3636094.5 i/s - same-ish: difference falls within error fast_version: 3448766.2 i/s - same-ish: difference falls within error master_version: 2463857.3 i/s - 1.52x slower ```
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"my string #{nil}" results in an additional '' string allocation, I'm guessing because the nil has to be converted to a string. "my string #{'[]' if multiple}" results in "my string #{nil}" if multiple is false. Doing "my string #{''}" does not result in an extra string allocation. This code mainly seems to be executed during the first page load of an app. For my app, this saved 3698 allocations of "" - around 150 KB of savings. See rails#32302 Benchmarking results: ``` results: ```ruby master_version {:FREE=>-1981, :T_STRING=>2052} master_version with arg {:FREE=>-1001, :T_STRING=>1000} fast_version {:FREE=>-1001, :T_STRING=>1000} fast_version with arg {:FREE=>-1001, :T_STRING=>1000} Warming up -------------------------------------- master_version 138.851k i/100ms master_version with arg 164.029k i/100ms fast_version 165.737k i/100ms fast_version with arg 167.016k i/100ms Calculating ------------------------------------- master_version 2.464M (±14.7%) i/s - 11.941M in 5.023307s master_version with arg 3.754M (± 8.5%) i/s - 18.699M in 5.021354s fast_version 3.449M (±11.7%) i/s - 17.071M in 5.033312s fast_version with arg 3.636M (± 6.9%) i/s - 18.205M in 5.034792s Comparison: master_version with arg: 3753896.1 i/s fast_version with arg: 3636094.5 i/s - same-ish: difference falls within error fast_version: 3448766.2 i/s - same-ish: difference falls within error master_version: 2463857.3 i/s - 1.52x slower ``` Benchmarking code: ```ruby begin require "bundler/inline" rescue LoadError => e $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler" raise e end gemfile(true) do source "https://rubygems.org" gem "benchmark-ips" gem "rails" end def allocate_count GC.disable before = ObjectSpace.count_objects yield after = ObjectSpace.count_objects after.each { |k,v| after[k] = v - before[k] } after[:T_HASH] -= 1 # probe effect - we created the before hash. GC.enable result = after.reject { |k,v| v == 0 } GC.start result end @html_options = {} def master_version(multiple=nil) "hi#{"[]" if multiple}" end def fast_version(multiple=nil) str = multiple ? "[]" : '' "hi#{str}" end def test puts "master_version" puts allocate_count { 1000.times { master_version } } puts "master_version with arg" puts allocate_count { 1000.times { master_version(' there') } } puts "fast_version" puts allocate_count { 1000.times { fast_version } } puts "fast_version with arg" puts allocate_count { 1000.times { fast_version(' there') } } Benchmark.ips do |x| x.report("master_version") { master_version } x.report("master_version with arg") { master_version(' there') } x.report("fast_version") { fast_version } x.report("fast_version with arg") { fast_version(' there') } x.compare! end end test ```
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Summary
"my string #{nil}"
results in an additional''
string allocation, I'mguessing because the nil has to be converted to a string.
"my string #{'[]' if multiple}"
results in"my string #{nil}"
ifmultiple is false. Doing
"my string #{''}"
does not result in an extrastring allocation. I moved the if multiple logic into a method so I only
had to make the change once.
Other Information
Benchmarking:
results: