Minutes_2018_12_04

Numba Meeting: 2018-12-04

Attendees: Siu, Ehsan, Stuart, Stan

LLVM 7
- OSX + Win issue with numba cache test
- Seems to related to low core count
Caching questions
- multiprocess caching relies on atomic file move
- there're known limitation that cache expiration check doesn't check other files
- caching function that takes function with arguments
  - currently function-as-argument is just a syntactic sugar for using function-as-global

#3560 - Hide messages from deliberate malloc impl overflow test as they can be alarming
#3559 - RunTimeWarning is sometimes raised in vectorized function and should not
- may have to do with np.isnan, or other FP flags
#3557 - numpy.ndarray.copy() incorrect when operating on less common array layouts
#3555 - "RuntimeError: missing Environment" using print in second call to cached numba function
#3554 - Slicing array[:0] fails with parallel=True in 0.41
- PR #3558 fixes
#3553 - CUDA device->host transfer with non-contiguous arrays overwrites adjacent elements
- Fix by detecting situation and launching custom copy kernel
#3551 - Workqueue scheduler hangs on prange calling function containing prange
- how would runtime detection work? need to generate both versions? (Probably too hard)
- just try to inline function call inside prange body
#3550 - Host-to-device copy of broadcast arrays mangles data
#3548 - Performance regression from 0.38 to 0.41
#3546 - [Feature Discussion] Nested Reflected Types

#3561 - Fixing the boolean copy from data
#3558 - Fixes array analysis for inplace binary operators.
#3556 - [WIP] Support for np.trim_zeros
#3552 - Handle broadcast arrays correctly in host->device transfer.
#3549 - ParallelAccelerator caching improvements
- Siu needs to add skip tests
#3545 - Fix @njit description in 5 min guide
- Ready to merge
#3543 - Avoid implementation error being hidden by the try-except
- Ready to merge

#3538 - Avoid future C-level assertion error due to invalid visibility
- Ready to merge
#3516 - [WIP] Typeof dtype values
- Siu needs to re-review
#3519 - WIP: fix-3457 support of numpy repeat.
#3520 - Fix @stencil ignoring cval if out kwarg supplied.
- Discussion on going
#3468 - Add support for np.clip and ndarray.clip.
- depends on fix on @overload_method for kwargs
3437 - Changes to accommodate LLVM 7.0.x
3450 - [WIP] generated_jit for CUDA kernels
3392 - Launch and attach gdb directly from Numba.
- ready for review
3390 - typeinfer: use unknown_loc object instead of string literal
3162 - Support constant dtype string in nopython mode in functions like numpy.empty.
- Need to resolve #3195
3134 - [WIP] Cfunc x86 abi
- Needs re-review
3046 - Pairwise sum implementation.
#2999 - Support LowLevelCallable
#2942 - Fix linkage nature (declspec(dllexport)) of some test functions
#2894: [WIP] Implement jitclass default constructor arguments.
#2817: [WIP] Emit LLVM optimization remarks

Merged old PRs

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