Parallel.For 的简单测试

    Parallel 是C#的一个并行类，近期正好用到，简单试验一下其性能配置。LZ电脑配置 CPU：i7-6700U,205GHZ。分别比较了Parallel.For和普通for的遍历耗时。代码如下

byte[] imageData = new byte[2048 * 2048 * 2];
byte[] imageDarkNoise = new byte[2048 * 2048 * 2];
for (int i = 0; i < imageData.Count(); i++)
{
	imageData[i] = 10;
	imageDarkNoise[i] = 1;
}
Stopwatch st = new Stopwatch();
st.Start();

//for (int j = 0; j < imageData.Count(); j = j + 2)
//{
//	int temp = imageData[j + 1] * 256 + imageData[j] - imageDarkNoise[j + 1] * 256 - imageDarkNoise[j];
//	if (temp < 0)
//		temp = 0;
//	imageData[j + 1] = (byte)(temp / 256);
//	imageData[j] = (byte)(temp % 256);
//}
Parallel.For(0, imageData.Count() / 2, (int j) =>
{
	int temp = imageData[2 * j + 1] * 256 + imageData[2 * j] - imageDarkNoise[2 * j + 1] * 256 - imageDarkNoise[2 * j];
	if (temp < 0)
		temp = 0;
	imageData[2 * j + 1] = (byte)(temp / 256);
	imageData[2 * j] = (byte)(temp % 256);
});
Utility.LogControl.UI(st.ElapsedMilliseconds.ToString());

结果：普通for:耗时150-170ms

Parallel.For ：耗时 40-50ms。性能提升还是很明显的