perf: use memoryview in write() to avoid copies#954
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Merging this PR will degrade performance by 10.05%
Warning Please fix the performance issues or acknowledge them on CodSpeed. Performance Changes
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Use memoryview slicing in TLSinTLSStream.write() and SyncStream.write() so that each iteration of the send loop does a zero-copy view advance instead of copying the remaining buffer bytes. Most visible on large POST uploads where partial sends cause repeated re-copies of the tail. Ported from https://codeberg.org/httpxyz/httpcorexyz/pulls/4 Closes pydantic#912 Closes encode/httpcore#1029 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> Co-Authored-By: naarob <laforge@forge-sync.local>
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This was referenced May 17, 2026
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I'm experimenting some benchmark strategies. Sorry the noise. |
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Summary
Use memoryview slicing in TLSinTLSStream.write() and SyncStream.write() so that each iteration of the send loop does a zero-copy view advance instead of copying the remaining buffer bytes. Most visible on large POST uploads where partial sends cause repeated re-copies of the tail.
Ported from https://codeberg.org/httpxyz/httpcorexyz/pulls/4
Closes #912
Closes encode/httpcore#1029