Extremely slow performance when dividing or multiplying a float by/to a fixnum
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Key: JRUBY-4693
URL: http://jira.codehaus.org/browse/JRUBY-4693
Project: JRuby
Issue Type: Bug
Environment: Mac OS X 10.6, MacBook Pro 2.53, 4GB
Reporter: Stevie Graham
Assignee: Thomas E Enebo
Priority: Minor
Fix For: JRuby 1.4
Multiplying by a reciprocal (float) is extremely slow. The difference in
performance between division and multiplication is far greater than on any
other vm.
e.g.
require 'benchmark'
Benchmark.bmbm do |x|
x.report("divide:") { 9999999.times { 999999999 / 8 } }
x.report("multiply:") { 9999999.times { 999999999 * 0.125 } }
end
Rehearsal ---------------------------------------------
divide: 1.960000 0.000000 1.960000 ( 1.783000)
multiply: 21.506000 0.000000 21.506000 ( 21.505000)
----------------------------------- total: 23.466000sec
user system total real
divide: 1.962000 0.000000 1.962000 ( 2.079000)
multiply: 23.535000 0.000000 23.535000 ( 23.535000)
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