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GeezerVison is showing github.com — Use bytearray.take_bytes to speed up asyncio.streams · Issue #141863 · python/cpython

Use bytearray.take_bytes to speed up asyncio.streams #141863

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Use bytearray.take_bytes to speed up asyncio.streams#141863
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performancePerformance or resource usagePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-asynciotype-featureA feature request or enhancementA feature request or enhancement

Description

@cmaloney
cmaloney
opened on Nov 23, 2025
Issue body actions

Feature or enhancement

Proposal:

Multiple codepaths in asyncio.streams operate on self._buffer (a bytearray) and then "take" (copy and delete bytes from original) when returning or passing them to other functions. That code pattern can be optimized with .take_bytes() added in gh-139871

Pyperformance:

tb_base.json
============

Performance version: 1.13.0
Python version: 3.15.0a2+ (64-bit) revision 227b9d326ec
Report on Linux-6.17.8-arch1-1-x86_64-with-glibc2.42
Number of logical CPUs: 32
Start date: 2025-11-22 16:18:13.127794
End date: 2025-11-22 16:18:41.207577

tb_asyncio.json
===============

Performance version: 1.13.0
Python version: 3.15.0a2+ (64-bit) revision 6982581e422
Report on Linux-6.17.8-arch1-1-x86_64-with-glibc2.42
Number of logical CPUs: 32
Start date: 2025-11-22 16:13:46.913998
End date: 2025-11-22 16:14:14.140152

### asyncio_tcp ###
Mean +- std dev: 169 ms +- 2 ms -> 143 ms +- 6 ms: 1.18x faster
Significant (t=18.89)

### asyncio_tcp_ssl ###
Mean +- std dev: 546 ms +- 8 ms -> 533 ms +- 6 ms: 1.02x faster
Significant (t=6.02)

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

  • gh-141863: Use bytearray.take_bytes in asyncio.streams #141864

Activity

  1. cmaloney
    added
    type-featureA feature request or enhancementA feature request or enhancement
    on Nov 23, 2025
  2. cmaloney
    added a commit that references this issue on Nov 23, 2025

    pythongh-141863: Use bytearray.take_bytes in asyncio.streams

    0b150fc
  3. StanFromIreland
    added
    performancePerformance or resource usagePerformance or resource usage
    topic-asyncio
    stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
    on Nov 23, 2025
  4. github-project-automation
    added this to asyncioon Nov 23, 2025
  5. github-project-automation
    moved this to Todo in asyncioon Nov 23, 2025
  6. kumaraditya303
    added a commit that references this issue on Nov 24, 2025

    gh-141863: use `bytearray.take_bytes` in asyncio streams for better p…

    b484c32
  7. kumaraditya303
    closed this as completedon Nov 24, 2025
  8. github-project-automation
    moved this from Todo to Done in asyncioon Nov 24, 2025
  9. StanFromIreland
    added a commit that references this issue on Dec 6, 2025

    pythongh-141863: use `bytearray.take_bytes` in asyncio streams for be…

    962fd05
  10. ashm-dev
    added a commit that references this issue on Dec 8, 2025

    pythongh-141863: use `bytearray.take_bytes` in asyncio streams for be…

    1fd61d5
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    performancePerformance or resource usagePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-asynciotype-featureA feature request or enhancementA feature request or enhancement

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