Minutes_2023_09_12

Numba Meeting: 2023-09-12

Attendees: Siu Kwan Lam, Guilherme, Da Li, Graham Markall, Stuart, Todd A. Anderson, Kaustubh, Brandon Willard FPOC (last week): Guilherme FPOC (incoming): Graham

NOTE: All communication is subject to the Numba Code of Conduct.

Please refer to this calendar for the next meeting date.

0. Discussion

• 0.58.0rc2 published
  • wheels and conda packages are ready
  • Will be announced on Discourse too
  • Main fix: the new deprecation warnings that couldn't be turned off / suppressed in RC1
    • PR #9152: Fix old_style error capturing deprecation warnings
  • Aiming to release final 0.58 next week
• Numpy 2.0 discussions:
  • Pin 0.58 final to use NumPy < 2.0 ?
  • How NumPy2.0 compliant does Numba has to be?
    • Discussion to take place on Discourse with the community in a few weeks' time.
    • Different options for compliance between 1.x / 2.x

New "Ready for Review" PRs

1. New Issues

• numba#9182 - RecursionError in parfor prelowering
• numba#9185 - Numba Dispatch error when Number of keyword args > 3 for nested numba calls
• *** numba#9186 - [Discuss] generates extra branches in LLVM IR 0.57.1
  • https://github.com/numba/numba/blob/release0.57/numba/core/codegen.py#L1192 - changing opt=0 to 1 in the cheap module pass manager helps? - can https://github.com/numba/numba/issues/8430 also help?
  • What is the performance difference? <5%, depends on the workload on Skylake
  • Could do with a reproducer of performance drop for analysis - maybe not the branches observed in the supplied reproducer
  • Setting NUMBA_OPT flag to max runs O3 passes twice that might help
• numba#9187 - TypeError when referencing value from typed dict get() with prange()
• *** numba#9188 - get_allocation_stats needs an init guard in 0.57.x, since new envvar NRT_STATS
  • Need a guard with a more informative message explaining how to enable the stats if requested.
  • A patch to implement this would be gratefully received
• numba#9192 - Fork safety test incorrectly using SemLocks from mixed multiprocessing contexts.
• numba#9193 - Tracking NumPy usage in various modules.

Closed Issues

• numba#9180 - numpy.std function not returning the correct results

2. New PRs

• numba#9189 - Align searchsorted behaviour with numpy
• numba#9190 - Fix issue with incompatible multiprocessing context in test.
• numba#9191 - Add a Numba power-on-self-test script and use in CI.

Closed PRs

• merged - numba#9181 - Remove extra decrefs in RNG
• merged - numba#9183 - Cherrypicks for 0.58.0rc2
• numba#9184 - Update changelog for 0.58.0rc2

3. Short-term Roadmap

gantt: https://github.com/numba/numba/issues/8971