Java extension performance comparison on JRuby 1.7.24 / 9.0.5.0 / 9.1.x.x

bench.rb

require 'java'
require 'benchmark'

TIMES = (ARGV[0] || 5).to_i

TIMES.times do
  Benchmark.bm(10) do |bm|
    bm.report('List') do
      list = java.util.ArrayList.new
      one = 1.to_java
      two = 2.to_java
      thr = 3.to_java
      1_000_000.times do
        list.clear

        list << one; list << two; list << thr

        list[2] = one
        list[0] = two
        list[1] = thr

        list.index(one)
        list.rindex(thr)
      end
    end
  end
end

result_default.out

#### 1.7.24
                 user     system      total        real
List         8.710000   1.400000  10.110000 (  7.017000)
                 user     system      total        real
List         6.920000   0.130000   7.050000 (  6.047000)
                 user     system      total        real
List         6.780000   0.060000   6.840000 (  5.830000)
                 user     system      total        real
List         6.250000   0.070000   6.320000 (  5.453000)
                 user     system      total        real
List         6.690000   0.130000   6.820000 (  5.718000)

#### 9.0.5.0 
                 user     system      total        real
List         6.990000   0.960000   7.950000 (  6.189472)
                 user     system      total        real
List         4.440000   0.170000   4.610000 (  4.554358)
                 user     system      total        real
List         4.200000   0.000000   4.200000 (  4.186065)
                 user     system      total        real
List         4.500000   0.010000   4.510000 (  4.482301)
                 user     system      total        real
List         4.690000   0.000000   4.690000 (  4.677239)

#### 9.1.x.x
                 user     system      total        real
List         2.910000   0.390000   3.300000 (  2.070244)
                 user     system      total        real
List         1.290000   0.030000   1.320000 (  1.276111)
                 user     system      total        real
List         1.290000   0.240000   1.530000 (  1.529822)
                 user     system      total        real
List         1.240000   0.280000   1.520000 (  1.473230)
                 user     system      total        real
List         1.170000   0.070000   1.240000 (  1.164659)

result_interp.out

#### 1.7.24
                 user     system      total        real
List        17.100000   1.170000  18.270000 ( 15.903000)
                 user     system      total        real
List        16.660000   0.010000  16.670000 ( 15.061000)
                 user     system      total        real
List        17.350000   0.010000  17.360000 ( 15.937000)
                 user     system      total        real
List        18.040000   0.000000  18.040000 ( 16.552000)
                 user     system      total        real
List        15.410000   0.000000  15.410000 ( 13.922000)

#### 9.0.5.0 
                 user     system      total        real
List        20.820000   0.840000  21.660000 ( 20.724984)
                 user     system      total        real
List        15.370000   0.300000  15.670000 ( 15.357027)
                 user     system      total        real
List        14.450000   0.250000  14.700000 ( 14.491476)
                 user     system      total        real
List        22.350000   0.060000  22.410000 ( 22.335163)
                 user     system      total        real
List        13.270000   0.000000  13.270000 ( 13.245202)

#### 9.1.x.x
                 user     system      total        real
List         5.180000   0.190000   5.370000 (  5.068730)
                 user     system      total        real
List         3.280000   0.530000   3.810000 (  3.705552)
                 user     system      total        real
List         3.190000   0.750000   3.940000 (  3.940179)
                 user     system      total        real
List         3.200000   0.050000   3.250000 (  3.195196)
                 user     system      total        real
List         3.160000   0.020000   3.180000 (  3.151076)