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Test.go
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Test.go
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package main
import (
"fmt"
"time"
)
func main() {
// 变量声明
var result, i uint64
// 单个协程执行累加操作
start := time.Now()
for i = 1; i <= 10000000000; i++ {
result += i
}
// 统计计算耗时
elapsed := time.Since(start)
fmt.Printf(" 执行消耗的时间为:", elapsed)
fmt.Println(", result:", result)
// 4 个协程共同执行累加操作
start = time.Now()
ch1 := calc(1, 2500000000)
ch2 := calc(2500000001, 5000000000)
ch3 := calc(5000000001, 7500000000)
ch4 := calc(7500000001, 10000000000)
// 汇总 4 个协程的累加结果
result = <-ch1 + <-ch2 + <-ch3 + <-ch4
// 统计计算耗时
elapsed = time.Since(start)
fmt.Printf(" 执行消耗的时间为:", elapsed)
fmt.Println(", result:", result)
}
// 在协程中异步执行累加操作,累加结果通过 channel 传递
func calc(from uint64, to uint64) <-chan uint64 {
// channel 用于协程间的通信
ch := make(chan uint64)
// 在协程中执行累加操作
go func() {
result := from
for i := from + 1; i <= to; i++ {
result += i
}
// 将结果写入 channel
ch <- result
}()
// 返回结果是用于通信的 channel
return ch
}