TCPCopy - A TCP Stream Replay Tool


Although the real live flow is important for the test of Internet server applications, it is hard to simulate it as online environments are too complex. To support more realistic testing of Internet server applications, we develop a live flow reproduction tool - TCPCopy, which could generate the test workload that is similar to the production workload. Currently, TCPCopy has been widely used by companies in China.
TCPCopy has little influence on the production system except occupying additional CPU, memory and bandwidth. Moreover, the reproduced workload is similar to the production workload in request diversity, network latency and resource occupation.


  • Distributed stress testing
    • Use tcpcopy to copy real-world data to stress test your server software. Bugs that only can be produced in high-stress situations can be found
  • Live testing
    • Prove the new system is stable and find bugs that only occur in the real world
  • Regression testing
  • Performance comparison
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