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…7272) We tried this before with a dict and for all interned strings. That ran into problems due to interpreter isolation. However, exclusively using a per-interpreter cache caused some inconsistency that can eliminate the benefit of interning. Here we circle back to using a global cache, but only for statically allocated strings. We also use a more-basic _Py_hashtable_t for that global cache instead of a dict. Ideally we would only have the global cache, but the optional isolation of each interpreter's allocator means that a non-static string object must not outlive its interpreter. Thus we would have to store a copy of each such interned string in the global cache, tied to the main interpreter. (cherry-picked from commit b72947a)
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Misc/NEWS.d/next/Core and Builtins/2023-07-25-15-29-26.gh-issue-106931.kKU1le.rst
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
Statically allocated string objects are now interned globally instead of | ||
per-interpreter. This fixes a situation where such a string would only be | ||
interned in a single interpreter. Normal string objects are unaffected. |
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