Windows 7中的RAM使用不合理

If you want the OS not to use your RAM, take it out of your machine and sit it on your desk. But so long as the RAM is in the machine, using it is free. If you're thinking "I want the RAM free now so I can use it later", you're being silly. You can use it now and use it later. There is no disadvantage to using the RAM. None at all.

Modern operating systems only make RAM free if they have no choice. This is because there are only two things that can happen. If the RAM is used soon, then they just have to make the RAM used again, wasting the effort they went through to make the RAM free -- it is easier to move RAM directly from one use to another. And if the RAM is not used soon, then the effort of making it free is again wasted. Making RAM free is a last resort used only if the OS has no other choice because it adds an extra step the OS will have to go through in order to use the RAM.

只有在极少数情况下需要RAM并且操作系统无法将RAM从一种用途转换为另一种用途（例如，在中断上下文中）时，才需要可用RAM。为此，仅需要非常少量的RAM，在现代计算机上通常为64MB左右。多余的可用RAM就是浪费。

考虑程序是否运行然后停止。该程序在RAM中。操作系统可以释放RAM或将程序保留在RAM中。如果程序很快再次运行，将其保留在RAM中将是一个巨大的胜利-避免了磁盘I / O。如果不需要将RAM用于其他目的，则将程序保留在RAM中的成本为零。因此，操作系统将程序保留在RAM中，直到需要其他RAM为止。在不需要可用RAM时将RAM释放是纯粹的失败主张。