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A comment on Ruby is too slow for programming competitions.

Re:Ruby is too slow for programming competitions by VeejayRampay on Sunday April 21, 2013 @02:07PM (#5585691)
Maybe the result would vary with JRuby or Rubinius (I'd be interested in benchmarks) because not only is Ruby itself not the fastest language, but its main implementation (MRI) is also not the best for speed.
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Re:Ruby is too slow for programming competitions by ClifReeder on Sunday April 21, 2013 @02:22PM (#5585756)
This is a good point that I didn't consider. Running the 'just iterate over the range version' of this code with jruby:

    [master] clifff@fair_and_square: ruby -v
    jruby 1.7.3 (1.9.3p385) 2013-02-21 dac429b on Java HotSpot(TM) 64-Bit Server VM 1.6.0_43-b01-447-11M4203 [darwin-x86_64]
    [master] clifff@fair_and_square: time ruby fair_and_square.rb C-large-1.in.bak

    real	6m39.105s
    user	6m37.762s
    sys	0m19.009s
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Re:Ruby is too slow for programming competitions by digger250 on Monday April 22, 2013 @09:03AM (#5589064)
When I run the benchmark in C-ruby (2.0.0) I get:

  real	2m35.450s
  user	2m35.257s
  sys	0m0.139s
On jruby with invokedynamic:

  time ruby -Xcompile.invokedynamic=true file2.rb C-large-1.in

  real	1m17.711s
  user	1m15.618s
  sys	0m0.830s
In jruby without invokedynamic time ruby file2.rb C-large-1.in

  real	1m37.856s
  user	1m39.260s
  sys	0m0.854s
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Re:Ruby is too slow for programming competitions by aghoreyshi on Sunday April 21, 2013 @02:27PM (#5585784)
What is sys time? The amount of time it's actually run on the processor?
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Re:Ruby is too slow for programming competitions by eatitraw on Sunday April 21, 2013 @02:34PM (#5585811)
No, it is the amount of time your program spent in system calls: http://stackoverflow.com/questions/556405/what-do-real-user-...
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Re:Ruby is too slow for programming competitions by jmah on Sunday April 21, 2013 @02:42PM (#5585845)
The amount of time spent in system calls (i.e. the kernel).
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