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How does the performance of PyPy and Jython compare?

• rguillebert 12y ago
  Jython is usually slower than CPython I believe, it has no GIL though.
  • rdtsc 12y ago
    Wonder if it can be faster under higher parallelism conditions. Multiple threads doing some CPU intensive work?
    • sitkack 12y ago
      Jython can utilize threads as well as Java can, so on many core machine Jython wins by a pretty large margin.
• pipeep 12y ago
  According to Jython's (a little dated) FAQ <https://wiki.python.org/jython/JythonFaq/GeneralInfo> https://wiki.python.org/jython/JythonFaq/GeneralInfo>, "Jython is approximately as fast as CPython--sometimes faster, sometimes slower. Because most JVMs--certainly the fastest ones--do long running, hot code will run faster over time." PyPy aims to be (and is in many cases) faster than CPython. The advantage with Jython isn't a performance one: it's the ability to call Java code directly.