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require 'benchmark'
SIMPLE_TIMES = 10_000_000
GROWTH_TIMES = 8_000
# prepare dummy objects
default_object = Class.new.new
default_object.instance_variable_set(:@foo,2)
disposable_objects = (0..10).map{Class.new.new}
simple_reader = proc do |o|
result = nil;
for i in (0..SIMPLE_TIMES)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
result = o.instance_variable_get(:@foo)
end
result
end
simple_writer = proc do |o|
for i in (0..SIMPLE_TIMES)
o.instance_variable_set(:@foo,0)
o.instance_variable_set(:@foo,1)
o.instance_variable_set(:@foo,2)
o.instance_variable_set(:@foo,3)
o.instance_variable_set(:@foo,4)
o.instance_variable_set(:@foo,5)
o.instance_variable_set(:@foo,6)
o.instance_variable_set(:@foo,7)
o.instance_variable_set(:@foo,8)
o.instance_variable_set(:@foo,9)
end
end
Benchmark.bmbm do |b|
b.report "baseline x#{SIMPLE_TIMES}" do
for i in (0..SIMPLE_TIMES)
1
end
end
b.report "single threaded reads x#{SIMPLE_TIMES}" do
simple_reader.call(default_object)
end
b.report "single threaded writes x#{SIMPLE_TIMES}" do
simple_writer.call(default_object)
end
b.report "two reader threads x#{SIMPLE_TIMES}" do
t1 = Thread.new{simple_reader.call(default_object)}
t2 = Thread.new{simple_reader.call(default_object)}
t1.join;t2.join
end
b.report "one reader, one writer x#{SIMPLE_TIMES}" do
t1 = Thread.new{simple_reader.call(default_object)}
t2 = Thread.new{simple_writer.call(default_object)}
t1.join;t2.join
end
b.report "single threaded growth x#{GROWTH_TIMES}" do
o = disposable_objects.pop
(0..GROWTH_TIMES).each{|i| o.instance_variable_set(:"@bar_#{i}",1)}
end
end
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