Scalene v2.2.1 Bug Fixes sys.monitoring tool ID conflict with PyTorch (#1015, #1019): Fixed SIGSEGV crash when using Scalene with PyTorch Lightning on Python 3.12+. When PROFILER_ID is already claimed by another tool, Scalene now falls back to alternative tool IDs (3 or 4), or gracefully uses the legacy PyEval_SetTrace tracer. TensorFlow 2.21+ compatibility (#1018): Fixed compatibility with TensorFlow 2.21+ where trace.enabled changed from a callable to a bool. Scalene now applies a compatibility fix at profiler start time. Multiprocessing resource tracker (#1017): Fixed BrokenPipeError on NixOS with Python 3.13/3.14 when the resource tracker subprocess dies during semaphore creation. Scalene now falls back from spawn/forkserver to fork context. Subprocess profiling (#1013): Fixed profiling failing when Python interpreter flags (like -B or -u) precede -c or -m in subprocess invocations. Windows timer thread shutdown (#1012): Fixed fatal gilstate_tss_set error on Windows when the timer thread shuts down. Windows --on/--off support (#1010): Added support for --on and --off flags on Windows using Named Events. __future__ flags in exec/eval (#1008): Fixed __future__ compiler flags not being propagated in exec/eval/compile replacements. Windows multiprocessing (#1005, #998): Fixed spawn-mode multiprocessing Pool support on Windows, including pickle corruption and memoryview cleanup issues. New Features Async-aware profiling (#1006): Added async-aware profiling support using sys.monitoring on Python 3.12+. C23 allocator support (#1011): Added support for C23 free_sized and free_aligned_sized functions in SampleHeap. Other Changes Improved shell script portability for NixOS/Guix using #!/usr/bin/env bash Code formatting updates via Black Full Changelog: https://github.com/plasma-umass/scalene/compare/v2.1.4...v2.2.1

If you use or refer to Scalene, please cite it as below.