Bug #13418: Improve Time#to_i performance

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN

[watson1978 (Shizuo Fujita)]

Time#to_i will be faster around 80%.

Before

       user     system      total        real
   2.840000   0.000000   2.840000 (  2.847238)

After

       user     system      total        real
   1.600000   0.000000   1.600000 (  1.598911)

Test code

require 'benchmark'

Benchmark.bmbm do |x|
  x.report do
    t = Time.now
    20000000.times do
      t.to_i
    end
  end

end

Patch

https://github.com/ruby/ruby/pull/1576

• Status changed from Open to Closed

Applied in changeset trunk|r58308.

---

time.c: Improve Time#to_i performance

Time#to_i will be faster around 80% (on 64-bit platforms).

• Before
  user system total real
  2.840000 0.000000 2.840000 ( 2.847238)

• After
  user system total real
  1.600000 0.000000 1.600000 ( 1.598911)

• Test code
  require 'benchmark'

Benchmark.bmbm do |x|
x.report do
t = Time.now
20000000.times do
t.to_i
end
end
end

• time.c (_div): new function avoid rb_funcall
  (div): replace with new _div function
  [ruby-core:80636] [Bug #13418]
  Thanks to Watson [e-mail] for the patch.

From: Watson [e-mail]