[issue44282] IDLE: ColorDelegatorTest test_incremental_editing failures
Terry J. Reedy
report at bugs.python.org
Wed Jun 2 15:02:09 EDT 2021
Terry J. Reedy <tjreedy at udel.edu> added the comment:
The confusion is my fault: PR-26404 is where I first saw this failure, for the previously added tests, not where the test was added. I unlinked the erroneous message.
Running 12 duplicate tests in parallel on Windows on a 6 core (12 CPU) machine with
f:\dev\3x>python -m test -j12 -ugui -m test_incremental_editing test_idle test_idle test_idle test_idle test_idle test_idle test_idle test_idle test_idle test_idle test_idle test_idle
resulted in nearly all failing. Half or less failed with -j6, usually one with -j3, none without -j. Are the processess failing because of interaction with each other? Or from be switched with other processes?
Back with -j12: increasing the after delay in run_in_tk_mainloop from 1 to 5 cut the failures down to 0-4 in 12. Increasing further to 8 resulting in no failures. Note that human keystrokes are at least, say, 50 milliseconds (1/20 second) apart.
I am reluctant to add a delay that is mostly not needed, so i tried the uploaded 'adaptive' code to only add a long delay if needed. Uploaded. But when a tested failed once, it failed again even with the delay, and contrary to the results above.
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Added file: https://bugs.python.org/file50084/tkinter_testing_utils.py
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