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Python Code Profiling Libraries: py-spy, Scalene, memray & More

Profilers for finding Python performance and memory bottlenecks: built-in, sampling, line-level, memory and tracing tools.

20 topics•5 categories•Updated October 2026

Built-in Tools

4 entries

Included with Python.

01timeitTimes small snippets of code. 02cProfile and profileDeterministic profilers in the standard library. 03tracemallocTraces memory blocks allocated by Python. 04Python support for the Linux perf profilerHow to profile Python with Linux perf.

CPU & Sampling Profilers

6 entries

Find where time is spent.

05py-spySampling profiler that attaches to running processes; very active in October 2026. 06PyinstrumentLow-overhead statistical profiler. 07ScaleneCPU, GPU and memory profiler. 08YappiProfiler supporting threads and asyncio. 09AustinFrame-stack sampler for CPython. 10line_profilerLine-by-line timing.

Memory Profilers

2 entries

Find where memory goes.

11memrayMemory profiler from Bloomberg. 12memory_profilerLine-by-line memory usage; its last GitHub update was April 2024, so check maintenance before relying on it.

Tracing & Visualization

3 entries

Timelines, flame graphs and viewers.

13PalanteerVisual profiler and debugger; very active in October 2026. 14FunctionTraceGraphical Python profiler. 15SnakeVizBrowser viewer for cProfile output.

Related Pages

5 entries

Neighbouring pages on this site.

16PythonPython hub. 17Python IDEsPython IDEs. 18Static Code Analysis ToolsStatic analysis tools. 19Software TestingSoftware testing. 20Application Performance Monitoring ToolsAPM tools.

Frequently Asked Questions

How do I profile Python code?

Start with cProfile or a sampling profiler such as py-spy or Pyinstrument to find hot functions, then use line_profiler for detail and memray or tracemalloc for memory.

What is the difference between deterministic and sampling profilers?

Deterministic profilers such as cProfile record every call and add overhead, while sampling profilers such as py-spy check the stack periodically and are cheaper for production use.

Is memory_profiler still maintained?

Its last GitHub update was in April 2024, so consider memray or tracemalloc for new work.

How current is this page?

Links were checked in October 2026. Sites that block automated checks are kept and may need a manual click. Last-commit dates are from GitHub in October 2026 and show activity only; check each project's release notes before adopting it.