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| -rw-r--r-- | doc/faq.rst | 13 |
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diff --git a/doc/faq.rst b/doc/faq.rst index 78db591f..d7ae3641 100644 --- a/doc/faq.rst +++ b/doc/faq.rst @@ -50,6 +50,19 @@ If you are using the :ref:`API <api>`, you need to call coverage.start() before importing the modules that define your functions. +**Q: Coverage is much slower than I remember, what's going on?** + +Make sure you are using the C trace function. Coverage.py provides two +implementations of the trace function. The C implementation runs much faster. +To see what you are running, use ``coverage debug sys``. The output contains +details of the environment, including a line that says either ``tracer: CTracer`` +or ``tracer: PyTracer``. If it says ``PyTracer`` then you are using the +slow Python implementation. + +Try re-installing coverage.py to see what happened and if you get the CTracer +as you should. + + **Q: Does coverage.py work on Python 3.x?** Yes, Python 3 is fully supported. |