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The current implementation of LimitedStream is slow because .read() performs an extra copy into a buffer and .readline() performs two extra copies. The stream being wrapped is already typically a BytesIO object so this is unnecessary. This implementation has largely been untouched for 12 years and, inspired by a simpler implementation in werkzeug, it was possible to achieve the following performance improvement: LimitedStream.read() (single line): Mean +- std dev: [bench_limitedstream-main] 286 ns +- 6 ns -> [bench_limitedstream-patch] 227 ns +- 6 ns: 1.26x faster LimitedStream.readline() (single line): Mean +- std dev: [bench_limitedstream-main] 507 ns +- 11 ns -> [bench_limitedstream-patch] 232 ns +- 8 ns: 2.18x faster LimitedStream.read(8192) (single line): Mean +- std dev: [bench_limitedstream-main] 360 ns +- 8 ns -> [bench_limitedstream-patch] 297 ns +- 6 ns: 1.21x faster LimitedStream.readline(8192) (single line): Mean +- std dev: [bench_limitedstream-main] 602 ns +- 10 ns -> [bench_limitedstream-patch] 305 ns +- 10 ns: 1.98x faster LimitedStream.read() (multiple lines): Mean +- std dev: [bench_limitedstream-main] 290 ns +- 5 ns -> [bench_limitedstream-patch] 236 ns +- 6 ns: 1.23x faster LimitedStream.readline() (multiple lines): Mean +- std dev: [bench_limitedstream-main] 517 ns +- 19 ns -> [bench_limitedstream-patch] 239 ns +- 7 ns: 2.16x faster LimitedStream.read(8192) (multiple lines): Mean +- std dev: [bench_limitedstream-main] 363 ns +- 8 ns -> [bench_limitedstream-patch] 311 ns +- 11 ns: 1.17x faster LimitedStream.readline(8192) (multiple lines): Mean +- std dev: [bench_limitedstream-main] 601 ns +- 12 ns -> [bench_limitedstream-patch] 308 ns +- 7 ns: 1.95x faster Geometric mean: 1.59x faster |
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| .. | ||
| __init__.py | ||
| tests.py | ||
| urls.py | ||
| views.py | ||