text: #!/usr/bin/env python
  # -*- coding: UTF-8 -*-
  #
  # Copyright (c) 2020 ASMlover. All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions
  # are met:
  #
  #  * Redistributions of source code must retain the above copyright
  #    notice, this list ofconditions and the following disclaimer.
  #
  #  * Redistributions in binary form must reproduce the above copyright
  #    notice, this list of conditions and the following disclaimer in
  #    the documentation and/or other materialsprovided with the
  #    distribution.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  import asyncio
  import os
  import platform
  import sys
  import threading
  import time
  
  
  async def async_launch():
      def __do_launch():
          if platform.system() == 'Linux':
              cmd = r"./build/CoroServe ec"
          else:
              cmd = r".\build\Debug\CoroServe.exe ec"
          os.system(cmd)
      threading.Thread(target=__do_launch).start()
  
  async def main():
      try:
          count = int(sys.argv[1])
      except Exception as e:
          count = 1
  
      print(f"run {count} clients ...")
  
      beg_counter = time.perf_counter()
      await asyncio.gather(*[async_launch() for _ in range(count)])
      use_counter = time.perf_counter() - beg_counter
      print(f"run all clients use: {use_counter}")
  
  if __name__ == '__main__':
      try:
          asyncio.run(main())
      except KeyboardInterrupt:
          print("launch client quit")
      except Exception as e:
          print(e)
  