What's Changed
Headlines
- Adds call graphs ("flame graphs") spanning from Python to native code, organized by % of time
- Timeline view of call graphs ("flame chart"), including GIL, I/O, and GC activity
- Flame graph for memory allocations, attributing memory to call stacks
- Improved memory attribution (now tracked per-thread)
- Adds proper support for free-threaded Python
New feature work
- True free-threaded Python support: full memory + CPU profiling by @emeryberger in #1026
- Bucket native-thread allocations under (#857) by @emeryberger in #1031
- Native (C/C++) stack collection via signal-handler unwinding by @emeryberger in #1034
- Stitched Python+native stacks (combined_stacks) by @emeryberger in #1035
- GUI: combined_stacks viewer (top-N stitched Python+native stacks) by @emeryberger in #1037
- Timeline view for stitched Python+native stacks by @emeryberger in #1040
- Memory flame chart + sync per-sample stack capture by @emeryberger in #1042
- Shrink stack+timeline RAM, harden profiler self-exclusion by @emeryberger in #1043
- Shrink combined_stacks JSON and enforce schema validation by @emeryberger in #1044
- Timeline + memory-stacks polish: axes, gridlines, source-line tooltips by @emeryberger in #1045
- Minify the GUI bundle (-56% on disk) by @emeryberger in #1046
- GUI improvements: resizable charts, C++ demangling, stack filtering by @emeryberger in #1047
- Add per-thread native stack sampling for worker threads by @emeryberger in #1048
- Make --stacks the default; add --no-stacks opt-out by @emeryberger in #1050
- Drop C-side smear from per-line memory attribution and the flame view by @emeryberger in #1051
Bug fixes
- Fix root cause of resource tracker death in child processes (#1017) by @emeryberger in #1024
- Fix SIGSEGV on free-threaded Python with memory profiling by @emeryberger in #1025
- Fix memory profiling regressions by @emeryberger in #1027
- Fix CLI line number truncation for lines > 999 by @emeryberger in #1028
- Fix issue #1022: pytest-xdist + --profile-all on Linux dropped user samples by @emeryberger in #1055
- Clamp core_utilization to [0, 1] (fixes #1032) by @emeryberger in #1033
Full Changelog: v2.2.1...v2.3.0
Contributors
emeryberger