[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[Dong-hee Na]

Change by Dong-hee Na :


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nosy: +corona10

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19389
pull_request: https://github.com/python/cpython/pull/20085

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 3d17c045b4c3d09b72bbd95ed78af1ae6f0d98d2 by Victor Stinner in 
branch 'master':
bpo-40521: Add PyInterpreterState.unicode (GH-20081)
https://github.com/python/cpython/commit/3d17c045b4c3d09b72bbd95ed78af1ae6f0d98d2


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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:

I wrote a draft PR to make interned strings per-interpreter. It does crash 
because it requires to make method cache and _PyUnicode_FromId() (bpo-39465) 
compatible with subinterpreters.

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19386
pull_request: https://github.com/python/cpython/pull/20082

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19385
pull_request: https://github.com/python/cpython/pull/20081

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:


New changeset b7aa23d29fa48238dab3692d02e1f0a7e8a5af9c by Victor Stinner in 
branch 'master':
bpo-40521: Disable list free list in subinterpreters (GH-19959)
https://github.com/python/cpython/commit/b7aa23d29fa48238dab3692d02e1f0a7e8a5af9c


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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 89fc4a34cf7a01df9dd269d32d3706c68a72d130 by Victor Stinner in 
branch 'master':
bpo-40521: Disable method cache in subinterpreters (GH-19960)
https://github.com/python/cpython/commit/89fc4a34cf7a01df9dd269d32d3706c68a72d130


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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19276
pull_request: https://github.com/python/cpython/pull/19960

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19275
pull_request: https://github.com/python/cpython/pull/19959

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:


New changeset b4b53868d7d6cd13505321d3802fd00865b25e05 by Victor Stinner in 
branch 'master':
bpo-40521: Disable free lists in subinterpreters (GH-19937)
https://github.com/python/cpython/commit/b4b53868d7d6cd13505321d3802fd00865b25e05


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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 607b1027fec7b4a1602aab7df57795fbcec1c51b by Victor Stinner in 
branch 'master':
bpo-40521: Disable Unicode caches in isolated subinterpreters (GH-19933)
https://github.com/python/cpython/commit/607b1027fec7b4a1602aab7df57795fbcec1c51b


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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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pull_requests: +19252
pull_request: https://github.com/python/cpython/pull/19937

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

Change by STINNER Victor :


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keywords: +patch
pull_requests: +19248
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19933

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[issue40521] Make tuple, dict, frame free lists, unicode interned strings, unicode latin1 singletons per-interpreter

[STINNER Victor]

New submission from STINNER Victor :

tuple, dict and frame use free lists to optimize the creation of objects.

Unicode uses "interned" strings to reduce the Python memory footprint and 
speedup dictionary lookups.

Unicode also uses singletons for single letter Latin1 characters ([U+; 
U+00FF] range).

All these optimizations are incompatible with isolated subinterpreters, since 
caches are currently shared by all inteprepreters. These caches should be made 
per-intepreter. See bpo-40512 "Meta issue: per-interpreter GIL" for the 
rationale.

I already made small integer singletons per interpreter in bpo-38858:

* commit 5dcc06f6e0d7b5d6589085692b86c63e35e2325e
* commit 630c8df5cf126594f8c1c4579c1888ca80a29d59.

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components: Interpreter Core
messages: 368175
nosy: vstinner
priority: normal
severity: normal
status: open
title: Make tuple, dict, frame free lists, unicode interned strings, unicode 
latin1 singletons per-interpreter
versions: Python 3.9

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