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JonathonMA/time_fork.rb

Created April 10, 2015 11:21
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time_fork.rb
require 'fruity'
def bench(desc)
puts desc
Fruity.compare do
time_now { Time.now; nil }
time_now_utc { Time.now.utc; nil }
end
end
bench "prefork"
Process.fork do
bench "child"
end
Process.wait
bench "parent"
@JonathonMA
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OS X 10.10.2

prefork
Running each test 8192 times. Test will take about 1 second.
time_now is faster than time_now_utc by 4x ± 1.0
child
Running each test 4096 times. Test will take about 8 seconds.
time_now is faster than time_now_utc by 130x ± 10.0
parent
Running each test 8192 times. Test will take about 1 second.
time_now is faster than time_now_utc by 4x ± 1.0

@JonathonMA
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Docker image ruby:2.1.5-wheezy

prefork
Running each test 2048 times. Test will take about 1 second.
time_now is faster than time_now_utc by 2x ± 1.0
child
Running each test 2048 times. Test will take about 1 second.
time_now is faster than time_now_utc by 3x ± 0.1
parent
Running each test 2048 times. Test will take about 1 second.
time_now is faster than time_now_utc by 3x ± 0.1

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