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| author | Guido van Rossum <guido@python.org> | 2024-04-04 15:03:27 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-04-04 15:03:27 (GMT) |
| commit | 060a96f1a9a901b01ed304aa82b886d248ca1cb6 (patch) | |
| tree | cb3e95ecac1f90440b7d3752c4aad015ea734bf0 /Python/vm-state.md | |
| parent | 63bbe77d9bb2be4db83ed09b96dd22f2a44ef55b (diff) | |
| download | cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.zip cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.tar.gz cpython-060a96f1a9a901b01ed304aa82b886d248ca1cb6.tar.bz2 | |
gh-116968: Reimplement Tier 2 counters (#117144)
Introduce a unified 16-bit backoff counter type (``_Py_BackoffCounter``),
shared between the Tier 1 adaptive specializer and the Tier 2 optimizer. The
API used for adaptive specialization counters is changed but the behavior is
(supposed to be) identical.
The behavior of the Tier 2 counters is changed:
- There are no longer dynamic thresholds (we never varied these).
- All counters now use the same exponential backoff.
- The counter for ``JUMP_BACKWARD`` starts counting down from 16.
- The ``temperature`` in side exits starts counting down from 64.
Diffstat (limited to 'Python/vm-state.md')
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