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【C#】关于Array.Copy 和 GC

news 2025/7/27 22:18:12

关于Array.Copy 和 GC

	//一个简单的 数组copy   什么情况下会触发GC呢[ReliabilityContract(Consistency.MayCorruptInstance, Cer.MayFail)]public static void Copy(Array sourceArray,long sourceIndex,Array destinationArray,long destinationIndex,long length);

当源和目标的类型不一致，由小转大，比如由byte 到 short ，int 都会触发GC ，我不知道内部机制如何，可能是拆装箱导致的，不确定，不过在实际开发中确实出现了这种问题，所以使用的时候类型要匹配

贴一段测试代码

   void Update(){var start = DateTime.Now;for (int i = 0; i < this.inputData.Length; i++){this.inputData[i] = -125;var a = Mathf.Abs(this.inputData[i]);a = Mathf.Clamp(a, 0, 1023);this.inputData[i] = (short)(a * 255 / 1023);}Debug.Log($"<color=#ff00ff>CPU cost : {(DateTime.Now - start).TotalMilliseconds}</color>");start = DateTime.Now;**byte[] outData = new byte[size];**this.ComputeData(ref outData); //GPUint[] outData2 = new int[this.size];Array.Copy(outData, 0, outData2, 0, outData.Length);Debug.Log($"<color=#ffff00>GPU cost : {(DateTime.Now - start).TotalMilliseconds}</color>");}private void ComputeData(ref int[] outPutBytes){//if (this.inputbuffer == null){inputbuffer = new ComputeBuffer(this.inputData.Length, 4); //定义缓冲区（参数：数组长度、每个数组元素占用字节数）}//if (this.outputbuffer == null){outputbuffer = new ComputeBuffer(this.outputData.Length, 4);}inputbuffer.SetData(this.inputData); //待计算数据加载入缓冲区this.shader.SetBuffer(this.k, "inputData", inputbuffer); //定义输入口this.shader.SetBuffer(this.k, "outputData", outputbuffer); //定义输出口this.shader.Dispatch(this.k, this.inputData.Length / 1024, 1, 1); //开始执行（参数：主函数下标、线程组的XYZ个数）outputbuffer.GetData(this.outputData); //缓冲区获得计算好的数据for (int i = 0; i < this.outputData.Length; i++){outPutBytes[i] = (byte)this.outputData[i];}inputbuffer.Dispose(); //清除缓存outputbuffer.Dispose();}