unity3d：函数耗时记录，Profiler性能采样

立羽

发布于 2023-08-24 15:20:03

3220

发布于 2023-08-24 15:20:03

Time.time

在一帧内，Time.time只会赋值更新一次，所以一帧内获取不到时间差值。

void Start () {
        TestArrayAList();
    }

    void TestArrayAList()
    {
        int max = 100000000;
        int[] array;
        array = new int[max];
        List<int> list = new List<int>();
        float time = Time.time;

        for (int i = 0; i < max; i++)
        {
            array[i] = i;
        }
        Debug.Log(Time.time - time);

        time = Time.time;
        for (int i = 0; i < max; i++)
        {
            list.Add(i);
        }
        Debug.Log(Time.time - time);
        array = null;
    }

如上代码，输出为0

Stopwatch

void TestArrayAList()
    {
        int max = 100000000;
        int[] array;
        array = new int[max];
        List<int> list = new List<int>();
        float time = Time.time;
        Stopwatch stop = new Stopwatch();
        stop.Start();
        for (int i = 0; i < max; i++)
        {
            array[i] = i;
        }
        UnityEngine.Debug.Log(stop.ElapsedMilliseconds);
        stop.Reset();
        stop.Start();
        time = Time.time;
        for (int i = 0; i < max; i++)
        {
            list.Add(i);
        }
        UnityEngine.Debug.Log(stop.ElapsedMilliseconds);
        array = null;
    }

Profiler性能采样

void TestArrayAList()
    {
        int max = 10000; 
        int[] array;
        array = new int[max];
        List<int> list = new List<int>();
        float time = Time.time;
        Stopwatch stop = new Stopwatch();
        stop.Start();
        Profiler.BeginSample("TestArray");
        for (int i = 0; i < max; i++) 
        {
            array[i] = i;
        }
        Profiler.EndSample();
        UnityEngine.Debug.Log(stop.ElapsedMilliseconds);
        stop.Reset();
        stop.Start();
        time = Time.time;
        Profiler.BeginSample("TestList");
        for (int i = 0; i < max; i++)
        {
            list.Add(i);
        }
        Profiler.EndSample();
        UnityEngine.Debug.Log(stop.ElapsedMilliseconds);
        array = null;
    }

    // Update is called once per frame
    void Update () {
        TestArrayAList();

    }