我曾經(jīng)time.Now().UnixNano()計(jì)算代碼某些部分的執(zhí)行時(shí)間，但我發(fā)現(xiàn)了一件有趣的事情。有時(shí) IO 操作后經(jīng)過的時(shí)間為零！它出什么問題了？代碼在Go 1.11中運(yùn)行，并使用標(biāo)準(zhǔn)庫"time"。Redis 庫是"github.com/mediocregopher/radix.v2/redis". redis服務(wù)器版本是3.2。我在 Windows 上使用 VSCode 編輯器運(yùn)行它。isGatherTimeStat = falseif rand.Intn(100) < globalConfig.TimeStatProbability { // Here I set TimeStatProbability 100 isGatherTimeStat = true}if isGatherTimeStat { timestampNano = time.Now()}globalLogger.Info("time %d", time.Now().UnixNano())resp := t.redisConn.Cmd("llen", "log_system")globalLogger.Info("time %d", time.Now().UnixNano())if isGatherTimeStat { currentTimeStat.time = time.Since(timestampNano).Nanoseconds() currentTimeStat.name = "redis_llen" globalLogger.Info("redis_llen time sub == %d", currentTimeStat.time) select { case t.chTimeStat <- currentTimeStat: default: }}以下是一些日志：[INFO ][2019-07-31][14:47:53] time 1564555673269444200[INFO ][2019-07-31][14:47:53] time 1564555673269444200[INFO ][2019-07-31][14:47:53] redis_llen time sub == 0[INFO ][2019-07-31][14:47:58] time 1564555678267691700[INFO ][2019-07-31][14:47:58] time 1564555678270689300[INFO ][2019-07-31][14:47:58] redis_llen time sub == 2997600[INFO ][2019-07-31][14:48:03] time 1564555683268195600[INFO ][2019-07-31][14:48:03] time 1564555683268195600[INFO ][2019-07-31][14:48:03] redis_llen time sub == 0[INFO ][2019-07-31][14:48:08] time 1564555688267631100[INFO ][2019-07-31][14:48:08] time 1564555688267631100[INFO ][2019-07-31][14:48:08] redis_llen time sub == 0
為什么 time.Now().UnixNano() 在 IO 操作后返回相同的結(jié)果？
幕布斯7119047
2023-07-10 14:23:57
