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#!/usr/bin/env ruby
require 'fiber'
require 'benchmark'
class Ring
attr_reader :id
attr_accessor :attach
def initialize(id)
@id = id
#puts "Creating ring ... #{id}"
@fiber = Fiber.new do
pass_message
end
end
def |(other)
other.attach = self if !other.nil?
#puts "attaching #{@id} to #{other.id}" if !other.nil?
other
end
def resume
@fiber.resume
end
def pass_message
#puts "I'm fiber #{@id}"
while message = message_in
#puts "... #{@id} I received message #{message}"
# do something with message
message_out(message)
end
end
def message_in
#puts "Resuming #{@attach.id}" if !@attach.nil?
@attach.resume if !@attach.nil?
end
def message_out(message)
Fiber.yield(message)
end
end
class RingStart < Ring
attr_accessor :message
def initialize(n, m, message)
@m = m
@message = message
super(n)
end
def pass_message
loop { message_out(@message) }
end
end
def create_chain_r(i, chain)
# recursive version
return chain if i<=0
r = chain.nil? ? Ring.new(i) : chain | Ring.new(i)
create_chain(i-1, r)
end
def create_chain(n, chain)
# loop version
# needed to avoid stack overflow for high n
n.downto(0) {
chain = chain | Ring.new(n)
}
chain
end
def run_benchmark(n, m)
mess = :hello
ringu = nil
chain = nil
tm = Benchmark.measure {
ringu = RingStart.new(0, m, mess)
chain = create_chain(n, ringu)
}.format("%10.6r\n").gsub!(/\(|\)/, "")
puts "setup time for #{n} fibers: #{tm}"
tm = Benchmark.measure {
m.times { ringu.message = chain.resume }
}.format("%10.6r\n").gsub!(/\(|\)/, "")
puts "execution time for #{m} messages: #{tm}"
end
n = (ARGV[0] || 1000).to_i
m = (ARGV[1] || 10000).to_i
5.times do
run_benchmark(n, m)
end
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