Scalene Releases

Latest: New visualizations, accuracy improvements, and bug fixes · 12 May 2026 - 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