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iterator: optimize merged iterator (again) #421

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qianbin wants to merge 1 commit into syndtr:master from qianbin:optimize-merged-iter

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qianbin commented Aug 9, 2022

specialize index heap with int type
use heap fix instead of pop&push

benchmarks:

$ benchstat master.txt pr.txt 
name                       old time/op  new time/op  delta
MergedIterator/2_iters-8   8.97µs ± 0%  6.34µs ± 0%  -29.38%  (p=0.008 n=5+5)
MergedIterator/50_iters-8   732µs ± 0%   580µs ± 1%  -20.67%  (p=0.008 n=5+5)


          iterator: optimize merged iterator

31a63ab

* specialize index heap with int type
* use heap fix instead of pop&push

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