Channel close latency

bench.cr

total_delay = Time::Span::ZERO
done = Channel(Time::Span).new

(ARGV[0]? || 1000).to_i.times do |i|
  ch = Channel(Int32).new

  501.times do |j|
    if j == 250
      spawn do
        delay = Time.measure do
          ch.close
        end

        done.send delay
      end
    else
      spawn do
        delay = Time.measure do
          ch.receive?
        end

        done.send delay
      end
    end
  end

  501.times do
    total_delay += done.receive
  end
end

puts total_delay