69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
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package main
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import "fmt"
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import "log"
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import "os"
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import "time"
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import "strconv"
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func assert_eq(a, b int64) {
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if a != b {
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log.Fatalf("assertion failed\nleft: %d, right: %d\n", a, b)
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}
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}
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func do_rec(ch chan int32, resch chan int64, n int32) {
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var sum int64
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var i int32
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for i = 0; i < n; i++ {
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sum += int64(<- ch)
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}
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fmt.Println(sum)
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resch <- sum
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}
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func do_send(ch chan int32, start, end int32) {
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for i := start; i < end; i++ {
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ch <- i
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}
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}
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func main() {
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if len(os.Args) != 5 {
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log.Fatalf("usage:\n\t%s <nsend> <nrec> <buflen> <nobj>\n", os.Args[0])
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}
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nsend, _ := strconv.Atoi(os.Args[1])
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nrec, _ := strconv.Atoi(os.Args[2])
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buflen, _ := strconv.Atoi(os.Args[3])
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nobj, _ := strconv.Atoi(os.Args[4])
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stopwatch := time.Now()
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ch := make(chan int32, buflen)
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resch := make(chan int64, 0)
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no := nobj
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for i := 0; i < nrec; i++ {
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n := no / (nrec - i)
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go do_rec(ch, resch, int32(n))
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no -= n
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}
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assert_eq(int64(no), 0)
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no = nobj
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for i := 0; i < nsend; i++ {
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n := no / (nsend - i)
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end := no
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no -= n
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go do_send(ch, int32(no), int32(end))
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}
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assert_eq(int64(no), 0)
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var sum int64
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for i := 0; i < nrec; i++ {
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sum += <-resch
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}
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elapsed := time.Now().Sub(stopwatch)
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rate := float64(nobj)/float64(elapsed.Nanoseconds())*1000.0
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duration := 1.0e-09 * float64(elapsed.Nanoseconds())
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fmt.Printf("%d objects in %g s (%.2f objs/µs)\n", nobj, duration, rate)
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expected_sum := int64(nobj)*int64(nobj-1)/2
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fmt.Printf("got: %d, expected: %d\n", sum, expected_sum)
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assert_eq(sum, expected_sum)
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}
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