Created by: RDCH106
What is this Python project?
Pyinstrument is a Python profiler. A profiler is a tool to help you 'optimize' your code - make it faster. It sounds obvious, but to get the biggest speed increase you should focus on the slowest part of your program. Pyinstrument helps you find it!
What's the difference between this Python project and similar ones?
Profiler with very good performance and low overhead, several output formats (text, json, html) and ability to profile a specific chunk of code.
Pyinstrument is a statistical profiler - it doesn't track every function call that your program makes. Instead, it's recording the call stack every 1ms.
That gives some advantages over other profilers. Firstly, statistical profilers are much lower-overhead than tracing profilers.
| Django template render × 4000 | Overhead | |
|---|---|---|
| Base |
████████████████ 0.33s |
|
| pyinstrument |
████████████████████ 0.43s |
30% |
| cProfile |
█████████████████████████████ 0.61s |
84% |
| profile |
██████████████████████████████████...██ 6.79s |
2057% |
But low overhead is also important because it can distort the results. When using a tracing profiler, code that makes a lot of Python function calls invokes the profiler a lot, making it slower. This distorts the results, and might lead you to optimise the wrong part of your program!
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