From: PvpDJgHP via ruby-core <ruby-core@...>
Date: 2023-02-24T03:42:52+00:00
Subject: [ruby-core:112568] [Ruby master Bug#19461] Time.local performance tanks in forked process (on macOS only?)

Issue #19461 has been updated by PvpDJgHP (��� PvpDJgHP).





In Dec 2016, someone investigated a related question and posted here:



https://stackoverflow.com/questions/41353532/41371753#41371753



This person's findings may be helpful.



----------------------------------------

Bug #19461: Time.local performance tanks in forked process (on macOS only?)

https://bugs.ruby-lang.org/issues/19461#change-102017



* Author: ioquatix (Samuel Williams)

* Status: Open

* Priority: Normal

* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN

----------------------------------------

The following program demonstrates a performance regression in forked child processes when invoking `Time.local`:



```ruby

require 'benchmark'

require 'time'



def sir_local_alot

  result = Benchmark.measure do

    10_000.times do

      tm = ::Time.local(2023)

    end

  end

  $stderr.puts result

end



sir_local_alot



pid = fork do

  sir_local_alot

end



Process.wait(pid)

```



On Linux the performance is similar, but on macOS, the performance is over 100x worse on my M1 laptop.









-- 

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