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Impact of stack size on exceptions performance
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$ ruby -v | |
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin17] | |
$ ruby yield-vs-block.rb | |
Nested yield stack size: 402 | |
Forward block stack size: 202 | |
Warming up -------------------------------------- | |
baseline 82.138k i/100ms | |
nested-yield 16.030k i/100ms | |
forward-block 28.945k i/100ms | |
Calculating ------------------------------------- | |
baseline 816.998k (± 2.9%) i/s - 4.107M in 5.031495s | |
nested-yield 178.248k (± 4.4%) i/s - 897.680k in 5.046095s | |
forward-block 280.624k (± 4.5%) i/s - 1.418M in 5.064693s | |
Comparison: | |
baseline: 816998.1 i/s | |
forward-block: 280623.7 i/s - 2.91x (± 0.00) slower | |
nested-yield: 178247.6 i/s - 4.58x (± 0.00) slower |
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require 'benchmark/ips' | |
module Bench | |
extend self | |
DummyError = Class.new(StandardError) | |
STACK_SIZE = Integer(ENV.fetch("STACK_SIZE", 200)) | |
def nested_yield_0 | |
yield | |
end | |
def forward_block_0 | |
yield | |
end | |
(1..STACK_SIZE).each do |i| | |
class_eval(<<~RUBY, __FILE__, __LINE__ + 1) | |
def nested_yield_#{i} | |
nested_yield_#{i - 1} { yield } | |
end | |
def forward_block_#{i}(&block) | |
forward_block_#{i - 1}(&block) | |
end | |
RUBY | |
end | |
alias_method :nested_yield, :"nested_yield_#{STACK_SIZE}" | |
alias_method :forward_block, :"forward_block_#{STACK_SIZE}" | |
end | |
puts "Nested yield stack size: #{Bench.nested_yield { caller.size }}" | |
puts "Forward block stack size: #{Bench.forward_block { caller.size }}" | |
Benchmark.ips do |x| | |
x.report('baseline') do |times| | |
i = 0 | |
while i < times | |
begin | |
raise Bench::DummyError | |
rescue Bench::DummyError | |
end | |
i += 1 | |
end | |
end | |
x.report('nested-yield') do |times| | |
Bench.nested_yield do | |
i = 0 | |
while i < times | |
begin | |
raise Bench::DummyError | |
rescue Bench::DummyError | |
end | |
i += 1 | |
end | |
end | |
end | |
x.report('forward-block') do |times| | |
Bench.forward_block do | |
i = 0 | |
while i < times | |
begin | |
raise Bench::DummyError | |
rescue Bench::DummyError | |
end | |
i += 1 | |
end | |
end | |
end | |
x.compare! | |
end |
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