两个Uint64的意外加法行为

问题

在下面的代码中,我有几个Go例程,我面临的问题是“calculateMemoryUsage()”Go例程,其中的平均内存使用量将每半秒计算一次。不知什么原因,总数一直给我奇怪的值。这是打印日志:

Memory Usage: 162224
Average: 162224
Total: 162224
Iteration Count: 1

Memory Usage: 181200
Average: 171712
Total: 343424
Iteration Count: 2

Memory Usage: 187864
Average: 119858
Total: 359576
Iteration Count: 3

如图所示,从第三次迭代开始,平均值就变糟了,因为总数加起来不对。在调试之后,我看到内存使用情况读起来很好,但是总的来说似乎给了我一些问题。我怀疑是GC,但在这个问题中,LastGC值被设置为0,这意味着没有执行GC。如有任何建议,将不胜感激!:)

代码

func main() {
    db, err := sql.Open("mysql", "<credentials_removed>@@tcp(127.0.0.1:3306)/rts")

    err = db.Ping()
    if err != nil {
        panic(err.Error()) // proper error handling instead of panic in your app
    }

    showStocksChannel := make(chan bool)
    showBestPerformingChannel := make(chan bool)



    go calculateMemoryUsage()
    go showStocks(showStocksChannel, db)
    go changeStockPrices(showStocksChannel, showBestPerformingChannel, db)
    go displayBestPerformingStocks(showBestPerformingChannel, db)

    showStocksChannel <- true

    select{}
}
func calculateMemoryUsage() {
    var averageMemoryUsage uint64 = 0
    var iterations uint64 = 0
    var usage uint64 = 0
    var total uint64 = 0

    for iterations <= 200 {
        var memoryStats runtime.MemStats
        runtime.ReadMemStats(&memoryStats)

        iterations = iterations + 1

        usage = memoryStats.Alloc
        total = (averageMemoryUsage + usage)
        averageMemoryUsage = total / iterations

        fmt.Printf("\nMemory Usage: %v\nAverage: %v\nTotal: %v\nIteration Count: %v\n\n", usage, averageMemoryUsage, total, iterations)



        time.Sleep(time.Millisecond * 1000)
        //fmt.Printf("\nLast GC: %v\nNext GC: %v\n\n", memoryStats.LastGC, memoryStats.NextGC)


    }

    fmt.Printf("\nAverage Memory Usage: %v bytes\n\n", averageMemoryUsage)
}