javascript – ZeroMQ的预期表现是什么？

请求者：

# requester.coffee

zmq                       = require 'zmq'
context                   = new zmq.Context()
socket                    = zmq.socket 'req'

socket.bind 'tcp://127.0.0.1:5555',( error ) =>
  throw error if error?
  console.log 'requesTing writer bound to port 5555'
  seTinterval ( -> socket.send 'Helo world' ),1


response_count  = 0
t0              = new Date() / 1000

socket.on 'message',( message ) ->
  response_count += 1
  # x = message.toString 'utf-8'
  if response_count % 1000 is 0
    t1              = new Date() / 1000
    console.log "received #{ parseInt response_count / ( t1 - t0 ) + 0.5 } messages per second"
    response_count  = 0
    t0 = new Date() / 1000

答复者：

# responder.coffee

zmq                       = require 'zmq'
context                   = new zmq.Context()
socket                    = zmq.socket 'rep'

socket.connect 'tcp://127.0.0.1:5555'
console.log 'Responder bound to port 5555'
process.stdin.resume()

request_count   = 0
t0              = new Date() / 1000

socket.on 'message',( message ) ->
  request_count += 1
  # message = message.toString 'utf-8'
  # console.log message
  socket.send 'Helo BACk'
  if request_count % 1000 is 0
    t1              = new Date() / 1000
    console.log "received #{ parseInt request_count / ( t1 - t0 ) + 0.5 } messages per second"
    request_count  = 0
    t0 = new Date() / 1000

现在,当我在ubuntu(11.10,8GB,Intel Duo Core 3GHz,NodeJS 0.8.6)机器的单独终端窗口中运行它时,我得到以下输出：

received 135 messages per second
received 6369 messages per second
received 6849 messages per second
received 6944 messages per second
received 7042 messages per second
received 7143 messages per second
received 5952 messages per second
received 2967 messages per second
received 914 messages per second
received 912 messages per second
received 928 messages per second
received 919 messages per second
received 947 messages per second
received 906 messages per second
received 918 messages per second
received 929 messages per second
received 916 messages per second
received 917 messages per second
received 916 messages per second
received 928 messages per second

其中(1)看起来有点像在几秒钟后传输通道有一些饱和; (2)感觉不够快.根据this benchmark,我应该是每秒几十万个,而不是几千个消息,这是this discussion(“ZeroMQ：接收10,000个消息大约需要15毫秒”).

我也试图使用python 3编写的回复者,并得到完全相同的数字.此外,我写了一个替代的脚本,主进程将产生一个子进程,并通过stdout / stdin进行通信;我每秒获得大约750条消息(当我增加消息长度时,我看不到太多的差异),这与zeromq实验中的相同的一个ballpark.

这些数字是否预期？这里有什么限制因素？

解决方法

$coffee responder.coffee
Responder bound to port 5555
received 282 messages per second
received 333357 messages per second
received 249988 messages per second
received 333331 messages per second
received 250003 messages per second
received 333331 messages per second
received 333331 messages per second
received 333331 messages per second
...