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require 'java'
require 'benchmark'
import java.lang.Math
Benchmark.bm(45) {|bm|
# Math.abs computation cost is negligible for these tests
(ARGV[0] || 5).to_i.times {
bm.report("Control") {
m = Math
value = 1
10_000_000.times { m; value }
}
bm.report("Math.abs with byte-ranged Fixnum") {
m = Math
value = 1
10_000_000.times { m.abs(value) }
}
bm.report("Math.abs with short-ranged Fixnum") {
m = Math
value = 1 << 8
10_000_000.times { m.abs(value) }
}
bm.report("Math.abs with int-ranged Fixnum") {
m = Math
value = 1 << 16
10_000_000.times { m.abs(value) }
}
bm.report("Math.abs with long-ranged Fixnum") {
m = Math
value = 1 << 32
10_000_000.times { m.abs(value) }
}
bm.report("Math.abs with float-ranged Float") {
m = Math
value = 2.0
10_000_000.times { m.abs(value) }
}
bm.report("Math.abs with double-ranged Float") {
m = Math
value = 2.0 ** 128
10_000_000.times { m.abs(value) }
}
bm.report("Contended Math.abs with double-ranged Float") {
m = Math
value = 2.0 ** 128
10.times.map {|i| Thread.new { 1_000_000.times { m.abs(value) } } }.each(&:join)
}
}
}
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