source: benchmark/readyQ/cycle.go @ 065de93

package main

import (
        "flag"
        "fmt"
        "sync/atomic"
        "time"
        "golang.org/x/text/language"
        "golang.org/x/text/message"
)

func partner(result chan uint64, mine chan int, next chan int) {
        count := uint64(0)
        for true {
                <- mine
                select {
                case next <- 0:
                default:
                }
                count += 1
                if  clock_mode && atomic.LoadInt32(&stop) == 1 { break }
                if !clock_mode && count >= stop_count { break }
        }

        atomic.AddInt64(&threads_left, -1);
        result <- count
}

func main() {
        var ring_size int

        ring_sizeOpt := flag.Int("r", 2, "The number of threads per cycles")

        bench_init()

        ring_size = *ring_sizeOpt

        tthreads := nthreads * ring_size
        threads_left = int64(tthreads)

        result := make(chan uint64)
        channels := make([]chan int, tthreads)
        for i := range channels {
                channels[i] = make(chan int, 1)
        }

        for i := 0; i < tthreads; i++ {
                pi := (i + nthreads) % tthreads
                go partner(result, channels[i], channels[pi])
        }
        fmt.Printf("Starting\n");

        atomic.StoreInt32(&stop, 0)
        start := time.Now()
        for i := 0; i < nthreads; i++ {
                channels[i] <- 0
        }
        wait(start, true);

        atomic.StoreInt32(&stop, 1)
        end := time.Now()
        duration := end.Sub(start)

        fmt.Printf("\nDone\n")

        global_counter := uint64(0)
        for i := 0; i < tthreads; i++ {
                select {
                case channels[i] <- 0:
                default:
                }
                global_counter += <- result
        }

        p := message.NewPrinter(language.English)
        p.Printf("Duration (ms)        : %d\n", duration.Milliseconds())
        p.Printf("Number of processors : %d\n", nprocs);
        p.Printf("Number of threads    : %d\n", tthreads);
        p.Printf("Cycle size (# thrds) : %d\n", ring_size);
        p.Printf("Total Operations(ops): %15d\n", global_counter)
        p.Printf("Ops per second       : %18.2f\n", float64(global_counter) / duration.Seconds())
        p.Printf("ns per ops           : %18.2f\n", float64(duration.Nanoseconds()) / float64(global_counter))
        p.Printf("Ops per threads      : %15d\n", global_counter / uint64(tthreads))
        p.Printf("Ops per procs        : %15d\n", global_counter / uint64(nprocs))
        p.Printf("Ops/sec/procs        : %18.2f\n", (float64(global_counter) / float64(nprocs)) / duration.Seconds())
        p.Printf("ns per ops/procs     : %18.2f\n", float64(duration.Nanoseconds()) / (float64(global_counter) / float64(nprocs)))

}