colblk: check first timestamp before binary search #4015
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This commit improves the code in the cockroach key seeker to first check the latest timestamp (which will be the one we're looking for in a majority of cases). ``` name old time/op new time/op delta CockroachDataBlockIterShort/AlphaLen=8,Prefix=8,Shared=4,KeysPerPrefix=4,Logical=10,ValueLen=8/Next-10 11.4ns ± 4% 11.2ns ± 1% ~ (p=0.308 n=8+8) CockroachDataBlockIterShort/AlphaLen=8,Prefix=8,Shared=4,KeysPerPrefix=4,Logical=10,ValueLen=8/SeekGE-10 118ns ± 0% 118ns ± 0% +0.24% (p=0.023 n=8+8) CockroachDataBlockIterShort/AlphaLen=8,Prefix=8,Shared=4,KeysPerPrefix=4,Logical=10,ValueLen=8/SeekGELatest-10 109ns ± 0% 108ns ± 6% -1.29% (p=0.019 n=8+7) CockroachDataBlockIterShort/AlphaLen=8,Prefix=128,Shared=64,KeysPerPrefix=4,Logical=10,ValueLen=128/Next-10 10.6ns ± 0% 10.6ns ± 0% -0.64% (p=0.000 n=7+8) CockroachDataBlockIterShort/AlphaLen=8,Prefix=128,Shared=64,KeysPerPrefix=4,Logical=10,ValueLen=128/SeekGE-10 95.0ns ± 0% 92.2ns ± 0% -2.94% (p=0.000 n=8+8) CockroachDataBlockIterShort/AlphaLen=8,Prefix=128,Shared=64,KeysPerPrefix=4,Logical=10,ValueLen=128/SeekGELatest-10 88.2ns ± 0% 83.6ns ± 0% -5.23% (p=0.000 n=8+7) ````
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jbowens
approved these changes
Oct 8, 2024
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Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status:complete! all files reviewed, all discussions resolved (waiting on @RaduBerinde)
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TFTR! |
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This commit improves the code in the cockroach key seeker to first
check the latest timestamp (which will be the one we're looking for in
a majority of cases).