Minutes_2020_10_20

Numba Meeting: 2020-10-20

Attendees: Siu, Graham, Hameer, Todd, Val, Guilherme, Stu, Juan

0.52.0RC1 & 0.52.0RC2
- Quickly discovered several minor issues in RC1.
- Planned to release RC2 this week then we'll ask downstreams and users to test
- Early feedbacks:
  - conda package issue with TBB
- Main change in RC2 will be turning down the "pre-optimization" from O1 to O0 because LLVM is not very good at consuming it's O1 output; e.g aggressive loop-vectorization fail
Report benchmarks ASV
- Val presents performance improvements
- https://nbviewer.jupyter.org/github/numba/numba-examples/blob/70925bd8c00529837e7bef342ad4fbd5cb7b1e25/benchmarks/0.52.1rc1_oct2020/Benchmark%20Analysis.ipynb
Upcoming tasks/risks declared for 0.53.0
- next release planned after new year holiday
- Hameer: working on sort algorithms; improvements and algos---timsort, radixsort
- Siu: Getting line coverage and cProfile working. Snakeviz plot of e.g. some alg is possible (once PR merged).
- Graham: Make the CUDA dispatcher use the same dispatcher as the CPU (the C/C++ code side of it). Some changes needed to C/C++ dispatcher which could impact all targets.
- Stuart: Piping more information into the dispatch logic from function level to be able to do dispatch based on metadata.

#6355 - NamedTuple type and List
- Can probably be implemented, marking as feature request
#6356 - Enumerate decrefs too eagerly
- Fixed, closed
#6360 - Inconsistent result for Numba in Metropolis-Hastings Distribution Implementation w/ SciPy interp2d
- Stalled, perhaps setting the seed might help, unable to reproduce.
#6366 - "Numba requires at least version 0.31.0 of llvmlite."
- waiting on answer
#6370 - CUDA tests: There is no RNG seeding in test_atomics.py
- In progress
#6371 - 0.52.0RC1 issues
- Fixes for most things in progress
#6381 - np.shift_left and np.shift_right unsupported for np.uint64
- Tedious to implement
#6382 - Release global interpreter lock (GIL) in ahead-of-time-compiled code
- Will run into the issue of config system mismatch between decorator options and Flags()
#6383 - Moran's I error
- Probably fixed in newer Numba version
#6386 - Can't AOT String Keyed Dictionaries: undefined symbol: _numba_hashsecret_siphash_k1
- Compiles correctly and then doesn't load
#6387 - NumPy ndarray expression with broadcast is slower when not use local variable.
- Maybe fixable, if expressed as loops rather than ufuncs
#6388 - NamedTuple fails if type name doesn't match variable name
- This is how Python works
#6389 - graphviz/dot internal buffer truncation causes issues for inspect_cfg.
- Fix available, closed