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19 sty 2018 · Generally speaking, when application starts, there are some startup process like loading environment variables or config files. In case of Python application, importing module takes most of startup time. For example, pipenv --version took about 800ms and import pipenv took 700ms.
Instead, I suspect this is due to the Python runtime initializing. The problem is that this application is started with a custom laucncher / taskbar application. The user will click the button to launch the app, see nothing appear to happen, and click elsewhere on another application.
Time-travel support is turned off when pyrewind is used as a REPL or used to execute a built-in module. recreate - this program takes a .rewind file as input and generates a SQLite-based history file as output with the .sqlite suffix.
PyTrace is a time travel recorder/analyzer for Python. It records code execution, variables and stack frames. Debugging has never been so easy.
In this small synthetic benchmark, PyPy is roughly 94 times as fast as Python! For more serious benchmarks, you can take a look at the PyPy Speed Center , where the developers run nightly benchmarks with different executables.
I've spent a while trying to improve IPython startup time (it's still pretty bad, but it's been worse), so I'm excited to see that Python 3.7 will make this easier to test. One trick I like to do is to simulate a cold start to get an idea of the worst case performance.
• Overview of module loading in Python • Improving startup performance • Prior art • Future work Agenda
