页帧
- 网络page frame
![页帧](../cache/1399427.jpg)
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页帧组成了主存,因此它是一个存储区域。
A page frame is a constituent of main memory , and hence it is a storage area .
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区分开页和页帧是很重要的,前者仅仅是一个数据块,它可以被存储在任何一个页帧中或者在硬盘上。
It is important to distinguish a page from a page frame ; the former is just a block of data , which may be stored in any page frame or on disk .
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分页部件认为所有的RAM都被分为固定大小的页帧(有时也叫物理页面)。
The paging unit thinks of all RAM as partitioned into fixed-length page frames ( sometimes referred to as physical pages ) .
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这种分页算法决定对当前位于RAM中的哪些虚拟内存页面的页帧进行回收,并放回到空闲列表中。
This paging algorithm determines which virtual memory pages currently in RAM ultimately have their page frames brought back to the free list .
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同样要注意,Windows允许进程间共享页帧,比如DLL分配的页帧,常常被多个应用程序同时使用。
It is also important to note that Windows allows page frames to be shared between processes , for example for DLLs , which are often used by several applications at once .
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VMM还维护一个称为空闲列表的对象,该对象定义为未分配的页帧。
VMM also maintains what is referred to as a free list , which is defined as unallocated page frames .
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可以使用VMM的页面置换算法来选择要重新分配页帧的虚拟内存页面。
The virtual memory pages whose page frames are to be reassigned are selected using the VMM 's page replacement algorithm .
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同时,VMM维护了一个未分配页帧的空闲列表,可以使用该列表来处理缺页的问题。
At the same time , VMM maintains a free list of unallocated page frames , which are used to satisfy page faults .
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让我们来介绍一下AIX5L中页帧方面一项重要的变化。
Let 's discuss one important change in AIX5L with respect to page frames .
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VMM提供了一种页面置换算法,该算法用于分配页帧,以及确定应该将当前RAM中的哪些虚拟内存页面的页帧置换回空闲列表。
The VMM has a page-replacement algorithm , which assigns the page frames and determines exactly which virtual-memory pages currently in RAM will have their page frames brought back to the free list .
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VMM常驻内存并在后台运行,尝试替换最近没有使用的页帧,其中使用到前面介绍的页面置换算法。
VMM is constantly lurking and working in the background trying to steal frames that have not been recently referenced , using the page replacement algorithm I discussed earlier .
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通常存在少量未分配页面(您可以自行配置),VMM可以使用这些页面来腾出空间并为其重新分配页帧。
There are usually a very small amount of unallocated pages ( which you configure ) that the VMM uses to free up space and reassign the page frames to .
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iVCE/M的性能主要取决于内存页帧存取过程中的网络通信开销,隐藏网络通信开销也是本文重点考虑的问题之一。
We consider the approach of hiding the network communication cost in this thesis .
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物理内存被划分成大小相同的页帧,页面分配器管理所有的页帧,负责分配和释放物理页面。
The page allocator , which is the manager of all the pages , allocates and frees physical pages .
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其余的页帧映射要靠虚拟内存系统的软件部分来实现。
It is the job of the virtual memory system to extend this into software , and to hold extra page-frame mappings .
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提交:程序可以访问的内存,得到了完全支持,就是说已经在分页文件中分配了页帧。
Committed : Memory that can be accessed by the program and is fully backed , which means that page frames have been allocated for it in the paging file .
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在对有大量内存的系统进行扫描时,因为页面置换算法始终寻找空闲帧,所以需要扫描的页帧数量非常大。
Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory , the number of frames to scan can be significant .
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内存节点不仅需要响应用户节点存取页帧的操作,还能自动分析用户节点在存取页帧过程中的模式,预测其后续操作,并主动把可能需要的页帧推向用户节点。
The memory node should not only respond the operation of memory page accessing of the user node , but also automatically analyze the pattern of the user node during their accessing , predict the sequential operation , and push the potential needed memory pages to the user node actively .
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全书所有文字说明均为中英文对照,共分13章,约260页,500帧照片,12开精装本。
The contents of this Album consists of 13 chapters with about 260 pages in 12 mo de luxe edition involving 500 photos with Chinese-English captions .
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这样允许同一页保存在一个页帧,在保存到磁盘后,重新冲磁盘装载到内存时可以放入另一个不同的页帧。
This allows the same page to be stored in a page frame , then saved to disk and later reloaded in a different page frame .
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物理存储页组织成大小相同的单位,通常称为页帧。
Physical storage is also organized into equal-sized units , most commonly known as page frames .
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操作系统有一种数据结构称为页表,将应用程序访问的虚拟页映射到主存中的实际页帧。
An operating-system data structure called the page table maps the virtual pages accessed by applications to real page frames in main memory .