我如何找到多线程应用程序的执行时间 [英] how can I find execution time of multi threaded application

问题描述

执行以下代码后，我将时间设为0，因为时间计算存在于主线程中，并且正在计算durationTime值，然后执行threadPool.

After execution of below code I am getting time as 0 , because time calculation is present in main thread and it is calculating durationTime value and then executing threadPool.

我想查找执行线程所花费的总时间.

I wants to find total time taken while executing threads.

public static void main(String[] args) {
        long startTime = System.nanoTime(); 
        int numberThread=10;
        String apiToBeCall="abcApi";

        Runnable r1=new SFSrmMainClass(apiToBeCall);

        ExecutorService threadPool=Executors.newFixedThreadPool(numberThread);
        for (int i=0;i<numberThread;i++)
        {

            threadPool.execute(r1);
        }
        threadPool.shutdown();

        long endTime = System.nanoTime();
         long durationTime = (endTime - startTime); 
        System.out.println("time for "+apiToBeCall +" is having thread="+numberThread +" is "+durationTime/1000000000);
    }

推荐答案

使用

Use awaitTermination after calling shutdown(), which blocks the main thread until all threads finished.

示例:

static long measureTasks(final int nThreads, final Runnable... tasks) 
    throws InterruptedException
{
    final ExecutorService pool = Executors.newFixedThreadPool(nThreads);
    final long startTime = System.nanoTime();

    for (Runnable task : tasks)
        pool.execute(task);

    pool.shutdown();
    pool.awaitTermination(10, TimeUnit.SECONDS);

    return System.nanoTime() - startTime;
}

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