From: Jeremy Evans <redmine@...>
Date: 2010-08-11T00:45:32+09:00
Subject: [ruby-core:31665] [Feature #3667] Speedup Date._parse and Date._strptime by using a Hash instead of a Date::Format::Bag

Issue #3667 has been updated by Jeremy Evans.


Tadayoshi Funaba,

Did you do any testing to see how the use of Struct affects performance?  In my testing, while your use of Struct provides a modest speedup over the previous code, it's nowhere near as much of a speedup as using a plain hash.

$ ruby -v
ruby 1.9.2dev (2010-07-11 revision 28618) [x86_64-openbsd4.7]


Date._parse:

$ time ruby date_parse.rb

real    0m1.222s
user    0m1.180s
sys     0m0.040s

$ time ruby -I date-struct date_parse.rb

real    0m1.152s
user    0m1.060s
sys     0m0.090s

$ time ruby -I date-hash date_parse.rb

real    0m0.805s
user    0m0.740s
sys     0m0.060s


Date._strptime:

$ time ruby date_strptime.rb

real    0m2.023s
user    0m1.990s
sys     0m0.030s

$ time ruby -I date-struct date_strptime.rb

real    0m1.974s
user    0m1.950s
sys     0m0.020s

$ time ruby -I date-hash date_strptime.rb

real    0m1.611s
user    0m1.580s
sys     0m0.030s


Please consider reverting your Struct commit (#28953) and committing my patch for a plain hash.

Thank you,
Jeremy Evans
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