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38
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1 package main
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2
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3 import (
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4 "fmt"
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5 "time"
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6 )
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7
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8 func main() {
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9 fmt.Println("- Channel Test with Fibonacci -")
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10 var t time.Time
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11 n, nfib := 0, 0
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12
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13 n, t = 25, time.Now()
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14 nfib = fib(n)
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15 fmt.Printf("n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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16
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17 n, t = 45, time.Now()
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18 nfib = fib(n)
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19 fmt.Printf("n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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20
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21 fmt.Println()
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22 fmt.Println("- Channel Test with Fibonacci #2 -")
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23 ch1 := make(chan int)
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24 ch2 := make(chan int)
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25
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26 n, t = 45, time.Now()
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27 go func(n int) {
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28 nfib := fib(n)
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29 fmt.Printf("goroutine: n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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30 ch1 <- nfib
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31 }(n)
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32
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33 n, t = 25, time.Now()
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34 go func(n int) {
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35 nfib := fib(n)
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36 fmt.Printf("goroutine: n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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37 ch2 <- nfib
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38 }(n)
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39
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40 n, t = 35, time.Now()
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41 nfib = fib(n)
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42 fmt.Printf(" - : n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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43
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44 <- ch1
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45 <- ch2
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46
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47 n, t = 5, time.Now()
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48 nfib = fib(n)
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49 fmt.Printf(" - : n=%d nfib=%d [%v]\n", n, nfib, time.Since(t))
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50
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51 fmt.Println("- End -")
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52 }
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53
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54 func fib(x int) int {
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55 if x < 2 {
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56 return x
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57 }
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58 return fib(x - 1) + fib(x - 2)
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59 }
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60
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