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gh-144960: Clarify GC threshold1 formula in set_threshold docs #145285

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gh-144960: Clarify GC threshold1 formula in set_threshold docs #145285

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9 changes: 5 additions & 4 deletions 9 Doc/library/gc.rst
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Expand Up @@ -139,10 +139,11 @@ The :mod:`!gc` module provides the following functions:
by 10% since the last collection and the net number of object allocations
has not exceeded 40 times *threshold0*, the collection is not run.

The fraction of the old generation that is collected is **inversely** proportional
to *threshold1*. The larger *threshold1* is, the slower objects in the old generation
are collected.
For the default value of 10, 1% of the old generation is scanned during each collection.
The fraction of the old generation that is scanned during each collection is
``1 / (10 * threshold1)``, making it **inversely** proportional to *threshold1*.
The larger *threshold1* is, the slower objects in the old generation are collected.
For the default value of 10, this means approximately 1% of the old generation is
scanned during each collection.

*threshold2* is ignored.

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