Hard drive manufacturers are sneaky, and when the operating system tells them to flush, they often don’t actually flush. They just say, “Yeah, I flushed the data,” and make a note to themselves, “Y’know, I probably should flush the data at some point before anybody notices that I’ve been lying to them all this time.” This can lead to strange things like a subsequent Read operation taking a very long time. It’s not that the read itself was inherently slow. It’s just that the read happened to occur while the drive was busy “paying back its flush debt”, so it got stuck behind a physical flush operation.

debian

DashMachine

编辑/etc/fstab文件，在后面添加（username自己替换）:

是

threadId = blockIdx.x;
其中threadId的取值范围为0到N-1。对于这种情况，我们可以将其看作是一个列向量，列向量中的每一行对应一个线程块。列向量中每一行只有1个元素，对应一个线程。

2.使用M×N个线程块，每个线程块1个线程
由于线程块是2维的，故可以看做是一个M*N的2维矩阵，其线程号有两个维度，即：