Issues

• Decompress/compress output buffer growth via _PyBytes_Resize causes avoidable copies and heap-layout-dependent performance

  pycompression/python-isal#256 · Filter by author Dreamsorcerer opened on Sep 7, 2026
  10

• macOS arm64 wheel ships only ISA-L base functions (no NEON/PMULL assembly), ~5x slower than the manylinux aarch64 wheel on the same CPU

  help wanted
  pycompression/python-isal#254 · Filter by author geoff-davis opened on Jul 16, 2026
  7

• arm64 is also a supported platform

  pycompression/python-isal#252 · Filter by author rhpvorderman opened on Jun 3, 2026

• Checkout the PyBytesWriter API instead of custom bytes resizing

  pycompression/python-isal#246 · Filter by author rhpvorderman opened on Dec 1, 2025
  1

• FAILED tests/test_igzip_threaded.py::test_flush on openEuler 22.03

  pycompression/python-isal#241 · Filter by author liuqinfei opened on Aug 22, 2025
  4

• Move to stable ABI?

  pycompression/python-isal#240 · Filter by author rhpvorderman opened on Aug 8, 2025

• Consider using ASAN-instrumented CPython build in CI

  help wanted
  pycompression/python-isal#237 · Filter by author ngoldbaum opened on Jul 18, 2025
  1

• Add support for the free-threaded build and upload cp313t wheels

  pycompression/python-isal#236 · Filter by author ngoldbaum opened on Jul 18, 2025
  2

• Add functions to (de)compress data blocks in one go

  pycompression/python-isal#221 · Filter by author rhpvorderman opened on Jan 10, 2025

• Allow multithreaded decompression of bgzip formats

  pycompression/python-isal#219 · Filter by author rhpvorderman opened on Dec 18, 2024

• Use more modern extension module features

  pycompression/python-isal#218 · Filter by author rhpvorderman opened on Nov 25, 2024