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Created on 2021-10-19 16:48 by nascheme, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Files | ||||
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| File name | Uploaded | Description | Edit | |
| pyperf-compare-addr-64.txt | nascheme, 2021-10-19 16:48 | |||
| Pull Requests | |||
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| URL | Status | Linked | Edit |
| PR 29062 | merged | nascheme, 2021-10-19 17:34 | |
| Messages (3) | |||
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| msg404317 - (view) | Author: Neil Schemenauer (nascheme) *  |
Date: 2021-10-19 16:48 | |
Given this feedback: https://github.com/python/cpython/pull/14474/files#r725488766 it is perhaps not so safe to assume that only the lower 48 bits of virtual addresses are significant. I had the idea that Go made similar assumptions but now I'm not sure it does. There is also a comment in this article about 5-level page tables in Linux: https://lwn.net/Articles/717293/ https://lwn.net/Articles/717300/ I.e. that Linux does not allocate virtual address space above 47-bit by default. Setting ADDRESS_BITS to 64 is safer and the performance impact seems small. The virtual memory size of a small Python process goes up a little. Resident set size doesn't significantly change. I think the pyperformance changes are just noise. The pyperformance attached file shows the 3.10 branch with ADDRESS_BITS set to 48 and to 64. |
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| msg404661 - (view) | Author: Łukasz Langa (lukasz.langa) * |
Date: 2021-10-21 21:05 | |
New changeset 0224b7180b280794b9fba62057b278ffb536c86f by Neil Schemenauer in branch 'main': bpo-45526: obmalloc radix use 64 addr bits (GH-29062) https://github.com/python/cpython/commit/0224b7180b280794b9fba62057b278ffb536c86f |
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| msg404662 - (view) | Author: Łukasz Langa (lukasz.langa) * |
Date: 2021-10-21 21:06 | |
Thanks, Neil! ✨ 🍰 ✨ |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:51 | admin | set | github: 89689 |
| 2021-10-21 21:06:33 | lukasz.langa | set | status: open -> closed type: enhancement messages: + msg404662 resolution: fixed stage: patch review -> resolved |
| 2021-10-21 21:05:55 | lukasz.langa | set | nosy:
+ lukasz.langa messages: + msg404661 |
| 2021-10-19 17:34:05 | nascheme | set | keywords:
+ patch pull_requests: + pull_request27329 |
| 2021-10-19 16:48:44 | nascheme | create | |