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Title: bpo-32403: Faster date and datetime constructors by pganssle · Pull Request #4993 · python/cpython · GitHub

Open Graph Title: bpo-32403: Faster date and datetime constructors by pganssle · Pull Request #4993 · python/cpython

X Title: bpo-32403: Faster date and datetime constructors by pganssle · Pull Request #4993 · python/cpython

Description: This fixes bpo-32403 and bpo-32404. The first one is a performance enhancement, the second is a bugfix. Using this script to benchmark the alternate constructors, I see significant improvements in speed across the board (note that since the subclasses don't take the fast path, they are a reasonable proxy for the speed from before this patch). You can see the results on my laptop (using the debug build, not the profiling optimized build) below: Running with N = 10000, k=20 | datetime | DateTimeSubclass ================================================================================= constructor | 1416.5 [1463.9 (±71) ns] | 1494.8 [1569.2 (±119) ns] fromordinal | 1081.5 [1117.2 (±24) ns] | 2180.7 [2357.3 (±279) ns] fromisoformat | 928.8 [962.5 (±34) ns] | 2834.8 [3179.7 (±281) ns] fromtimestamp | 1504.3 [1600.9 (±63) ns] | 3625.1 [3869.6 (±280) ns] utcfromtimestamp | 1178.6 [1281.2 (±172) ns] | 3242.6 [3445.0 (±205) ns] combine | 1060.1 [1111.0 (±73) ns] | 2808.7 [3013.0 (±236) ns] now | 1219.3 [1325.0 (±216) ns] | 3625.5 [3892.7 (±300) ns] today | 4868.5 [5261.0 (±565) ns] | 7189.5 [7663.0 (±436) ns] ================================================================================= | date | DateSubclass ================================================================================= constructor | 974.5 [1010.1 (±39) ns] | 1114.7 [1298.8 (±229) ns] fromordinal | 1059.7 [1109.4 (±59) ns] | 1923.1 [2258.8 (±375) ns] fromisoformat | 817.5 [905.1 (±123) ns] | 1734.1 [2160.8 (±542) ns] fromtimestamp | 1285.4 [1484.7 (±378) ns] | 2363.6 [3038.6 (±783) ns] today | 4551.7 [4976.6 (±584) ns] | 5828.9 [6883.9 (±934) ns] ================================================================================= For comparision, here is the same script run against master: Running with N = 10000, k=20 | datetime | DateTimeSubclass ================================================================================= constructor | 1335.9 [1350.3 (±24) ns] | 1406.0 [1426.9 (±15) ns] fromordinal | 1905.0 [1948.3 (±42) ns] | 2011.5 [2055.4 (±32) ns] fromisoformat | 918.1 [929.3 (±6) ns] | 2660.8 [2707.7 (±25) ns] fromtimestamp | 1570.1 [1611.8 (±28) ns] | 1732.1 [1766.3 (±30) ns] utcfromtimestamp | 1202.7 [1234.5 (±18) ns] | 1334.9 [1371.7 (±26) ns] combine | 2584.9 [2626.3 (±22) ns] | 2722.8 [2759.8 (±25) ns] now | 1317.2 [1338.2 (±9) ns] | 1509.7 [1563.7 (±24) ns] today | 5027.1 [5096.9 (±71) ns] | 5237.6 [5334.9 (±73) ns] ================================================================================= | date | DateSubclass ================================================================================= constructor | 912.8 [928.8 (±15) ns] | 996.4 [1003.9 (±7) ns] fromordinal | 1662.9 [1706.4 (±40) ns] | 1773.6 [1820.7 (±41) ns] fromisoformat | 818.5 [829.0 (±9) ns] | 1630.0 [1743.3 (±289) ns] fromtimestamp | 2155.2 [2213.4 (±41) ns] | 2321.9 [2486.9 (±590) ns] today | 5502.0 [5624.6 (±76) ns] | 5679.8 [5845.4 (±445) ns] ================================================================================= https://bugs.python.org/issue32403

Open Graph Description: This fixes bpo-32403 and bpo-32404. The first one is a performance enhancement, the second is a bugfix. Using this script to benchmark the alternate constructors, I see significant improvements in ...

X Description: This fixes bpo-32403 and bpo-32404. The first one is a performance enhancement, the second is a bugfix. Using this script to benchmark the alternate constructors, I see significant improvements in ...

Opengraph URL: https://github.com/python/cpython/pull/4993

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