这是我在SO上的第一个问题，但我已经潜水很久了，所以如果我违反了任何规则或发布了垃圾问题，请原谅。
我正在尝试更好地理解线程，并决定测试MRI并查看其总体性能。
鉴于以下代码（和输出），为什么线程操作比非线程变体要慢得多？
代码
class Benchmarker
def self.go
puts '----------Benchmark Start----------'
start_t = Time.now
yield
end_t = Time.now
puts "Operation Took: #{end_t - start_t} seconds"
puts '----------Benchmark End------------'
end
end
# using mutex
puts 'Benchmark 1 (threaded, mutex):'
Benchmarker.go do
array = []
mutex = Mutex.new
5000.times.map do
Thread.new do
mutex.synchronize do
1000.times do
array << nil
end
end
end
end.each(&:join)
puts array.size
end
# using threads
puts 'Benchmark 2 (threaded, no mutex):'
Benchmarker.go do
array = []
5000.times.map do
Thread.new do
1000.times do
array << nil
end
end
end.each(&:join)
puts array.size
end
# no threads
puts 'Benchmark 3 (no threads):'
Benchmarker.go do
array = []
5000.times.map do
1000.times do
array << nil
end
end
puts array.size
end
输出
Benchmark 1 (threaded, mutex):
----------Benchmark Start----------
5000000
Operation Took: 3.373886 seconds
----------Benchmark End------------
Benchmark 2 (threaded, no mutex):
----------Benchmark Start----------
5000000
Operation Took: 5.040501 seconds
----------Benchmark End------------
Benchmark 3 (no threads):
----------Benchmark Start----------
5000000
Operation Took: 0.454665 seconds
----------Benchmark End------------
提前致谢。