./parallel/py-threadpoolctl, Helpers to limit the number of threads used

[ Image CVSweb ] [ Image Homepage ] [ Image RSS ] [ Image Required by ]

Branch: CURRENT, Version: 3.7.0, Package name: py313-threadpoolctl-3.7.0, Maintainer: pkgsrc-users

Python helpers to limit the number of threads used in the threadpool-backed of
common native libraries used for scientific computing and data science (e.g.
BLAS and OpenMP).

Master sites:

Filesize: 31.212 KB

Version history: (Expand)

CVS history: (Expand)


   2026-09-23 15:11:47 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-threadpoolctl: updated to 3.7.0

3.7.0 (2026-09-15)

Fixed an intermittent OSError on Windows when DLLs are loaded or unloaded \ 
concurrently during library discovery (for example when importing conda-forge \ 
OpenCV). On Python 3.14+, discovery uses ctypes.util.dllist when available. If \ 
dllist raises OSError, threadpoolctl emits a RuntimeWarning instead of crashing \ 
so the failure can be reported upstream with a minimal reproducer. Older Pythons \ 
use a Toolhelp snapshot enumerator, with graceful per-module fallbacks.

Added the ability to check whether a limiting API affects just the current \ 
thread or the whole process. Mainly aimed at debugging and diagnostics, and \ 
somewhat unreliable, it is therefore enabled by default only for command-line \ 
usage.

Only warn about simultaneous libomp and libiomp usage on Linux, where the \ 
incompatibility is known to cause crashes.

Fixed a deadlock triggered by getting or setting MKL's number of threads from \ 
parallel threads when using MKL with libiomp (Intel threading) on Linux.

Going forward, setting the number of threads will only have a thread-local \ 
impact if feasible (for example, at minimum the underlying library must support \ 
this option, and many don't.)

For MKL, setting the number of threads is now thread-local, i.e. limiting the \ 
number of threads won't impact MKL's thread pool size when using MKL in other \ 
Python threads.

For OpenBLAS compiled with OpenMP on Linux and macOS, setting the number of \ 
threads is now thread-local, i.e. won't impact OpenBLAS thread pool size in \ 
other Python threads. On Windows behavior is likely process-wide, but this may \ 
depend on how OpenBLAS was compiled with OpenMP.

Fix OpenBLAS detection for conda package on Windows

Fixed a deadlock on Linux when using threadpoolctl from multiple threads.

Start using Python 3.14's built-in support for listing shared libraries.

On Linux, start using /proc/self/maps for listing shared libraries.

Avoid importing ctypes.util on Linux (and load libc with ctypes.CDLL(None)) so \ 
threadpool_info() does not create libffi closures that can abort after os.fork() \ 
on some libffi builds.

Dropped official support for Python 3.9.
   2026-08-12 23:47:29 by Thomas Klausner | Files touched by this commit (3) 
Log message:
py-threadpoolctl: fix build with flit_core 4.
   2025-03-13 16:09:25 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-threadpoolctl: updated to 3.6.0

3.6.0

Added support for libraries with a path longer than 260 on Windows. The \ 
supported path length is now 10 times higher but not unlimited for security \ 
reasons.

Dropped official support for Python 3.8.
   2025-02-23 20:33:50 by Thomas Klausner | Files touched by this commit (2) 
Log message:
py-threadpoolctl: adapt for flit_core 3.11.

Bump PKGREVISION.
   2024-04-30 08:54:18 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-threadpoolctl: updated to 3.5.0

3.5.0 (2024-04-29)

- Added support for the Scientific Python version of OpenBLAS
  (https://github.com/MacPython/openblas-libs), which exposes symbols with different
  names than the ones of the original OpenBLAS library.
  https://github.com/joblib/threadpoolctl/pull/175
   2024-03-23 08:22:53 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-threadpoolctl: updated to 3.4.0

3.4.0 (2024-03-20)
==================

- Added support for Python interpreters statically linked against libc or linked \ 
against
  alternative implementations of libc like musl (on Alpine Linux for instance).
  https://github.com/joblib/threadpoolctl/pull/171

- Added support for Pyodide
  https://github.com/joblib/threadpoolctl/pull/169
   2024-02-14 22:31:01 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-threadpoolctl: updated to 3.3.0

3.3.0 (2024-02-14)
==================

- Extended FlexiBLAS support to be able to switch backend at runtime.
  https://github.com/joblib/threadpoolctl/pull/163

- Added support for FlexiBLAS
  https://github.com/joblib/threadpoolctl/pull/156

- Fixed a bug where an unsupported library would be detected because it shares a \ 
common
  prefix with one of the supported libraries. Now the symbols are also checked to
  identify the supported libraries.
  https://github.com/joblib/threadpoolctl/pull/151
   2023-10-28 21:57:26 by Thomas Klausner | Files touched by this commit (516) | Package updated
Log message:
python/wheel.mk: simplify a lot, and switch to 'installer' for installation

This follows the recommended bootstrap method (flit_core, build, installer).

However, installer installs different files than pip, so update PLISTs
for all packages using wheel.mk and bump their PKGREVISIONs.