Message 294052 - Python tracker

Follow-up of the issue #30314. Copy of Serhiy Storchaka's msg294048:
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test_tools is so slow because it proceeds *all* Python files. This controlled by the "cpu" resource (only 10 random files are chosen if it is disabled).

Maybe disable the "cpu" resource on slow buildbots?
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Good point, I like the idea.

It seems like regrtest accepts -u all,-cpu option.