go /
go /
55c458e05f35d0d5d539107da07b744ad96f268e runtime: on bigger maps, start iterator at a random bucket.
This change brings the iter/delete pattern down to O(n lgn) from O(n^2).
Fixes #8412.
before:
BenchmarkMapPop100 50000 32498 ns/op
BenchmarkMapPop1000 500 3244851 ns/op
BenchmarkMapPop10000 5 270276855 ns/op
after:
BenchmarkMapPop100 100000 16169 ns/op
BenchmarkMapPop1000 5000 300416 ns/op
BenchmarkMapPop10000 300 5990814 ns/op
LGTM=iant
R=golang-codereviews, iant, khr
CC=golang-codereviews
https://golang.org/cl/141270043
2 files changed
