Add LIT parameter priority

[CaseyCarter]

To control test process priority. Defaults to IDLE_PRIORITY_CLASS. Has no effect without pip install psutil.

[StephanTLavavej]

Thanks, this is awesome! 😻 Now test runs should interfere less with Microsoft Teams. 🐈‍⬛

I pushed a commit to print a note when psutil isn't installed. This looks like:

D:\GitHub\STL\out\x64>pip list
Package Version
------- -------
pip     24.2

D:\GitHub\STL\out\x64>python tests\utils\stl-lit\stl-lit.py %STL%\tests\std\tests\Dev11_0272959_make_signed --succinct
NOTE: Module "psutil" is not installed, so the priority setting "idle" has no effect.
-- Testing: 49 tests, 32 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..

Testing Time: 1.78s

Total Discovered Tests: 49
  Unsupported:  4 (8.16%)
  Passed     : 45 (91.84%)

D:\GitHub\STL\out\x64>python tests\utils\stl-lit\stl-lit.py %STL%\tests\std\tests\Dev11_0272959_make_signed --succinct -Dpriority=low
NOTE: Module "psutil" is not installed, so the priority setting "low" has no effect.
-- Testing: 49 tests, 32 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..

Testing Time: 1.78s

Total Discovered Tests: 49
  Unsupported:  4 (8.16%)
  Passed     : 45 (91.84%)

D:\GitHub\STL\out\x64>pip install psutil
Collecting psutil
  Downloading psutil-6.1.0-cp37-abi3-win_amd64.whl.metadata (23 kB)
Downloading psutil-6.1.0-cp37-abi3-win_amd64.whl (254 kB)
Installing collected packages: psutil
Successfully installed psutil-6.1.0

D:\GitHub\STL\out\x64>pip list
Package Version
------- -------
pip     24.2
psutil  6.1.0

D:\GitHub\STL\out\x64>python tests\utils\stl-lit\stl-lit.py %STL%\tests\std\tests\Dev11_0272959_make_signed --succinct
-- Testing: 49 tests, 32 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..

Testing Time: 1.81s

Total Discovered Tests: 49
  Unsupported:  4 (8.16%)
  Passed     : 45 (91.84%)

D:\GitHub\STL\out\x64>python tests\utils\stl-lit\stl-lit.py %STL%\tests\std\tests\Dev11_0272959_make_signed --succinct -Dpriority=low
-- Testing: 49 tests, 32 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..

Testing Time: 1.78s

Total Discovered Tests: 49
  Unsupported:  4 (8.16%)
  Passed     : 45 (91.84%)

[StephanTLavavej]

Relabeled as this affects local test runs, not repository automation. We actually no longer install psutil in the VM image, because our new security policies hate pip install and I don't know how to cromulently phrase it when preparing a non-corpnet image.

[CaseyCarter]

Thanks, this is awesome! 😻 Now test runs should interfere less with Microsoft Teams. 🐈‍⬛

Yeah, I had no doubt my motivation would be obvious to anyone who saw my slideshow in standup yesterday =)

I pushed a commit to print a note when psutil isn't installed.

I went back and forth on this a couple of times trying to avoid any visible message when the user didn't explicitly specify a value for the parameter. This turns out to be surprisingly complicated to do without adding a separate default to the set of acceptable values that LIT reports when you specify a value not in that set. Now it occurs to me that "default" (currently equivalent to "idle") wouldn't be terrible. I'll keep it in mind and we'll make a change if this message is too scary for new users.

[StephanTLavavej]

I think we do actually want a message when the default is used, since otherwise the unfriendly behavior is invisible. (What's missing is a way to suppress the message without installing psutil)

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[StephanTLavavej]

🐈‍⬛ 📹 📺