DateTime.Now导致IO阻塞？ [英] DateTime.Now causes IO blocking?

问题描述

在新闻发布会上有人告诉我， DateTime.Now 导致IO阻塞，这东西我从来没有停下来考虑。如果是这样，为什么？

On a conference someone told me that DateTime.Now causes IO blocking, something that I have never stopped to consider. If it does, why?

推荐答案

没有人迄今已回答其中当前时间确实来自何处。我不是最新的最新的PC架构。但在几年前，所述实时时钟的是外侧的芯片的一部分CPU（南桥）。因此，要获得的时候，你不得不做一些I / O操作与芯片。 （这不是磁盘访问，但仍然是一个I / O操作。）

Nobody so far has answered where the current time is really coming from. I'm not up to date with the latest PC architecture. But a few years ago, the real-time clock was part of a chip outside of the CPU (south bridge). So to get the time, you had to do some I/O operations with that chip. (It's not disk access but still an I/O operation.)

此外，由于当前进程必须等待从时钟的答案，它的阻塞I / O。

And since the current process has to wait for the answer from the clock, it's blocking I/O.

这样的人在会议上是正确的。

So that person on the conference was right.

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