释放内存映射内存 [英] Release Memory Mapped Memory

问题描述

我是内存映射文件较大（〜200GB）为一个区域/视图和顺序写入数据。时不时地，我执行的boost ::进程间:: mapped_region ::冲洗（最后，当前，FALSE）。

I am memory mapping a large file (~200GB) into a single region/view and sequentially writing to it. Every now and then I perform a boost::interprocess::mapped_region::flush(last, current, false).

过了一会该过程使用了整个系统内存。其中，从我的理解，是正常的，因为它会被释放内存为其他处理请求的内存。

After a while the process uses up the entire system memory. Which, from what I understand, is normal as it will be releasing the memory as other process request memory.

这行之有效的Windows 8。然而，在Windows 7上运行它似乎并没有与驱动程序AJA视频卡发挥出色，并开始影响性能（IO丢弃数据包）。

This works well on Windows 8. However, running on Windows 7 it doesn't seem to play well with the drivers for AJA video cards and it starts affecting performance (dropping IO packets).

有没有什么办法可以强制Windows 7刷新存储到磁盘的部分（数据写入后，仅几秒钟有趣，记得我在整个文件写入顺序），以不能用了整个可用系统内存？

Is there any way I can force the Windows 7 to flush parts of the memory to disk (after the data is written it is only interesting for a few seconds, and remember I am writing sequentially through the entire file), as to not use up the entire available system memory?

推荐答案

法拉盛与复垦，IYAM无关。它只是确保脏页都写了（我想你还是需要一个磁盘同​​步，以确保它实际上/命中磁盘/）。

Flushing has nothing to with reclamation, IYAM. It just makes sure dirty pages are written out (I think you still need a disk sync to make sure it actually /hit the disk/).

所以，你正在寻找一种方式来取消映射。

So, you're looking for a way to unmap.

也许你可以使用像

• EmptyWorkingSet 驱逐尽可能多的网页尽可能


• SetProcessWorkingSetSize 以暂时减少允许的进程工作集。

当然，在一个更​​便携的时尚，你可能只是侥幸取消映射和重映射。如果访问的是纺纱硬盘和保持整个重映射的顺序，有可能不是一个性能损失（有可能是虽然，如果内核prefetched到的madvise例如，由于数据（）或Windows等价物）

Of course, in a more portable fashion, you might just get away with unmapping and remapping. If the access is to spinning HDD and remains sequential across remaps, there might not be a performance penalty (there might be though, if the kernel prefetched data e.g. due to madvise() or the windows equivalent thereof)

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