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Improved String#to_i performance for base <= 10 #2464

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merged 1 commit into from Jan 16, 2015
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@Who828 Who828 commented Jan 15, 2015

Addresses issue #2360 for base <= 10, both MRI and Rubyspecs test suites pass.

Running the benchmark provided without the patch

Calculating -------------------------------------
#to_i with an integer in a string
                       141.004k i/100ms
#to_i with a float in a string
                       157.672k i/100ms
#to_i with an empty string
                       172.789k i/100ms
#to_i with an integer and extra text
                       134.750k i/100ms
-------------------------------------------------
#to_i with an integer in a string
                         17.907M (±17.1%) i/s -     86.153M
#to_i with a float in a string
                         14.668M (±12.6%) i/s -     72.056M
#to_i with an empty string
                         32.909M (±24.9%) i/s -    153.437M
#to_i with an integer and extra text
                          7.122M (±11.9%) i/s -     34.900M

Running with the patch

Calculating -------------------------------------
#to_i with an integer in a string
                       124.910k i/100ms
#to_i with a float in a string
                       153.217k i/100ms
#to_i with an empty string
                       162.923k i/100ms
#to_i with an integer and extra text
                       151.294k i/100ms
-------------------------------------------------
#to_i with an integer in a string
                         18.690M (±14.5%) i/s -     90.810M
#to_i with a float in a string
                         14.590M (±14.2%) i/s -     71.093M
#to_i with an empty string
                         38.312M (±18.8%) i/s -    184.103M
#to_i with an integer and extra text
                         14.730M (±13.8%) i/s -     72.016M

headius added a commit that referenced this issue Jan 16, 2015
Improved String#to_i performance for base <= 10
@headius headius merged commit 7402c07 into jruby:master Jan 16, 2015
1 check passed
@headius headius added this to the JRuby 9.0.0.0-pre1 milestone May 4, 2015
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2 participants