[New-bugs-announce] [issue36670] test suite broken due to cpu usage feature on win 10/ german

[Lorenz Mende]

New submission from Lorenz Mende <lorenz.mende at gmail.com>:

The test suite fails with the first tests (I assume 1st call of getloadavg of WindowsLoadTracker).
Traceback (most recent call last):
  File "P:\Repos\CPython\cpython\lib\runpy.py", line 192, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "P:\Repos\CPython\cpython\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "P:\Repos\CPython\cpython\lib\test\__main__.py", line 2, in <module>
    main()
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 653, in main
    Regrtest().main(tests=tests, **kwargs)
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 586, in main
    self._main(tests, kwargs)
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 632, in _main
    self.run_tests()
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 515, in run_tests
    self.run_tests_sequential()
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 396, in run_tests_sequential
    self.display_progress(test_index, text)
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\main.py", line 150, in display_progress
    load_avg_1min = self.getloadavg()
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\win_utils.py", line 81, in getloadavg
    typeperf_output = self.read_output()
  File "P:\Repos\CPython\cpython\lib\test\libregrtest\win_utils.py", line 78, in read_output
    return response.decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x81 in position 67: invalid start byte
##########################################################
The windows 'typeperf "\System\Processor Queue Length" -si 1' command unluckily returns an string with an umlaut which leads to the Decode-Error. This comes up because the <counter> for the typeperf is location dependend. (In german the counter would read \System\Prozessor-Warteschlangenlänge)

I see two possible solutions to this issue.
1. Raising an exception earlier on creation of WindowsLoadTracker resulting in the same behaviour as if there is no typeperf available (german pythoneers would have a drawback with this)
2. Getting the typeperf counter correctly from registry (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Perflib\CurrentLanguage, described here https://social.technet.microsoft.com/Forums/de-DE/25bc6907-cf2c-4dc8-8687-974b799ba754/powershell-ausgabesprache-umstellen?forum=powershell_de)

environment:
Windows 10 x64, 1809, german
cpython @e16467af0bfcc9f399df251495ff2d2ad20a1669
commit of assumed root cause of https://bugs.python.org/issue34060

----------
components: Tests
messages: 340547
nosy: LorenzMende
priority: normal
severity: normal
status: open
title: test suite broken due to cpu usage feature on win 10/ german
type: crash
versions: Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36670>
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