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golang map delete 會釋放value嗎?

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喵喵時光機 2019-02-07 22:11:44

golang map delete 會釋放value嗎

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四季花海

TA貢獻1811條經(jīng)驗獲得超5個贊

不會釋放value，僅僅標記為不可用，但實際內(nèi)存還是在占用

1234567891011121314151617181920212223242526272829303132333435363738394041424344 package main import ( "log" "runtime") var intMap map[int]intvar cnt = 8192 func main() { printMemStats() initMap() runtime.GC() printMemStats() log.Println(len(intMap)) for i := 0; i < cnt; i++ { delete(intMap, i) } log.Println(len(intMap)) runtime.GC() printMemStats() intMap = nil runtime.GC() printMemStats()} func initMap() { intMap = make(map[int]int, cnt) for i := 0; i < cnt; i++ { intMap[i] = i }} func printMemStats() { var m runtime.MemStats runtime.ReadMemStats(&m) log.Printf("Alloc = %v TotalAlloc = %v Sys = %v NumGC = %v\n", m.Alloc/1024, m.TotalAlloc/1024, m.Sys/1024, m.NumGC)}