Output in jupyter cells gets truncated

Issue Type: Bug

Python environment set up with: `conda -n numba47 -c numba python=3 numba jupyter

The output of very long jupyter output cells gets truncated at the beginning.

Code to reproduce, run the following in “Python Interactive”:

# %%
from numba import njit, jit
import numpy as np
from llvmlite import binding as llvm

llvm.set_option("", "--debug-only=loop-vectorize")


@njit(fastmath=True)
def foo(x):
    acc = 0
    for v in np.nditer(x):
        acc += v.item()
    return acc


a = np.ones((100,), dtype=np.float32)
foo(a)

print(foo.inspect_llvm(foo.signatures[0]))

# %%

The output should have 695 lines with 40279 characters:

LV: Checking a loop in "_ZN8__main__7foo$241E5ArrayIfLi1E1C7mutable7alignedE" from foo
LV: Loop hints: force=? width=0 unroll=0
LV: Found a loop: B20

<... snipped ...>

!7 = distinct !{!7, !"_ZN8__main__7foo$241E5ArrayIfLi1E1C7mutable7alignedE"}
!8 = distinct !{!8, !1}
!9 = distinct !{!9, !3, !1}

Output has “only” 371 lines with 20368 characters:

i8, i8* %29, i64 %sunkaddr81
  %sunkaddr83 = getelementptr i8, i8* %sunkaddr82, i64 112
  %30 = bitcast i8* %sunkaddr83 to <4 x float>*

<... snipped ...>

!7 = distinct !{!7, !"_ZN8__main__7foo$242E5ArrayIfLi1E1C7mutable7alignedE"}
!8 = distinct !{!8, !1}
!9 = distinct !{!9, !3, !1}

Note that it gets truncated at the beginning.

Also: I verified that jupyter used without vscode DOES show the complete output.

Extension version: 2019.11.50794 VS Code version: Code 1.41.1 (26076a4de974ead31f97692a0d32f90d735645c0, 2019-12-18T14:58:56.166Z) OS version: Windows_NT x64 10.0.17763

System Info

Item	Value
CPUs	Intel® Core™ i5-5300U CPU @ 2.30GHz (4 x 2295)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off surface_control: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	7.88GB (2.58GB free)
Process Argv
Screen Reader	no
VM	0%

[ARF1]

@IanMatthewHuff For what it’s worth, I think that fixing full output is not urgent IF users get a message that their output was truncated and how to “fix” it themselves in the settings.

[ARF1]

@IanMatthewHuff Thanks for taking the time to let me know.

Not sure if it is related but the output in the vscode integrated shell (cmd) also gets truncated, though at the end if I remember correctly. (Have not tried with powershell.)

I have been meaning to file a separate report but have not gotten around to it yet. Thought I would let you know just in case it helps…