| 词汇 | example_english_virtual-memory |
| 释义 | Examples of virtual memoryThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. The current context is the physical/real memory, the other contexts are the virtualmemory. This is a virtualmemory space spread across a worldwide network of computers, which allow their spare capacity to be used at idle times. It must also have been an immense source of frustration to have a virtualmemory system based on fairly unreliable floppy disks. It is also necessary to check for stack overflow; but since overflow is so rare, this can usually be done at no cost using an inaccessible virtualmemory page. Two-space garbage collection works well until the residency of the program approaches half the real memory available, at which point the virtualmemory system begins to thrash. The system level architecture was shared virtualmemory, which was physically distributed in the machine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Mass storage is treated as a large space pool similar to the way virtualmemory is managed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The 80386 added a 32-bit architecture and a paging translation unit, which made it much easier to implement operating systems that used virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Nowadays the use of virtualmemory appears to provide lots of memory, but at the cost of performance. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. From the software perspective, 64-bit computing means the use of code with 64-bit virtualmemory addresses. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Attackers requiring a function in a certain library must guess where that library is loaded in virtualmemory space to call it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most computer operating systems use the concept of virtualmemory, allowing utilization of more primary storage capacity than is physically available in the system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is mitigated to some degree by perfecting the virtualmemory system, but not all computer architectures have virtualmemory support. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There may be multiple page sizes supported; see virtualmemory for elaboration. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This configuration was distinctly suboptimal for any productive use on anything but single tasking dedicated workstations due to the heavy reliance on virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They refer to physical memory rather than virtualmemory, and are accessed by special-purpose instructions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is a constant scalar incurred due to the virtualmemory mirroring used. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The more complex, or disk-bound, data structures tend to increase time cost, in general making increasing use of virtualmemory or disk. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Many of the concepts involved, such as virtualmemory, remained unproven. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This concept of overlays from drum under user control became common until virtualmemory became available in later machines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Therefore, there will always be 40 processes swapped out written on virtualmemory on the hard disk. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each time an attempt to access stored data is made, virtualmemory data orders translate the virtual address to a "physical address". From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It allows system software to use features such as virtualmemory, paging and safe multi-tasking designed to increase an operating system's control over application software. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The sum of the allocated virtualmemory assigned to tasks typically exceeds the total of real memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Resumption is a prerequisite for doing page style virtualmemory when operands cross page boundaries. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory was used as a persistent object store and unusually, the processor instruction set supported recursion (hence the name). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There was no support for virtualmemory or demand paging. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In some systems, areas of virtualmemory are instead assigned ring numbers in hardware. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With large address spaces and virtualmemory techniques they tend to be placed more freely, but they still typically grow in opposite directions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Within the software systems, the debugger accessed the process's virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The numeric processor also incorporated memory management and consequently employed virtualmemory concepts. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With the development of virtualmemory, kernels that supported this feature were given the vm- prefix to differentiate them. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each user space process normally runs in its own virtualmemory space, and, unless explicitly allowed, can not access the memory of other processes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This domain may include a private address space and software abstractions such as process, virtualmemory, file-systems, etc. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On operating systems which read executable images on demand from the disk (see virtualmemory), compressed executables make this process less efficient. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In modern software based cryptographic modules, zeroisation is made considerably more complex by issues such as virtualmemory, compiler optimisations and use of flash memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With virtualmemory, a contiguous range of virtual addresses can be mapped to several non-contiguous blocks of physical memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Cache coloring is typically employed by low-level dynamic memory allocation code in the operating system, when mapping virtualmemory to physical memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Page coloring makes virtualmemory as deterministic as physical memory in regard to cache performance. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is done by keeping several page tables that cover a certain block of virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most modern operating systems that support virtualmemory also run each process in its own dedicated address space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hardware support was provided for virtualmemory, which was common for machines in its class, and for garbage collection, which was unique. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Lastly, the virtualmemory system in most modern operating systems reserves a block of logical memory around address 0 as unusable. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Segments may also be used to implement virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For example, a computer capable of virtualization needs virtualmemory hardware so that the memory of different simulated computers can be kept separated. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The garbage collector uses generations and the virtualmemory is divided into areas. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These blocks can be paged in as needed by the virtualmemory system, needing no further processing to be ready to use. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The memory mapping process is handled by the virtualmemory manager, which is the same subsystem responsible for dealing with the page file. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Pilot combined virtualmemory and file storage into one subsystem, and used the manager/kernel architecture for managing the system and its resources. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Using virtualmemory hardware, each page can reside in any location of the computer's physical memory, or be flagged as being protected. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is very similar to modern virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory requires the processor to translate virtual addresses generated by the program into physical addresses in main memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When allocating sequential pages in virtualmemory for processes, the kernel collects pages with different colors and map them to the virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The virtualmemory is the space seen from a process. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This can particularly happen where the computer uses virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. While not necessary, emulators and virtual machines can employ hardware support to increase performance of their virtualmemory implementations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The operating system manages virtual address spaces and the assignment of real memory to virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Each program thus appears to have sole access to the virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The operating system used virtualmemory to provide a large address space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They redesigned the 9700, added virtualmemory and renamed the processor the 90/70. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Read-only virtualmemory may be changed by privileged programs that turn memory protection off (usually for very limited periods of time). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If needed, primary memory can be stored in secondary memory, through a memory management technique called virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Protected memory systems almost always include virtualmemory as well. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This behavior can easily be compared with virtualmemory, although any effects are contingent upon the compiler. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This approach is similar to an operating system with virtualmemory, which keeps the most recently used information in physical memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is designed to have virtualmemory and memory protection when available. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, with todays memories, the use of virtualmemory is no longer necessary for many applications which will fit within the host memory space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In addition, the most privileged ring may be given special capabilities, (such as real memory addressing that bypasses the virtualmemory hardware). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Any mmap() call may or may not specify an offset in virtualmemory to allocate the mapping at. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, in a virtualmemory system, the operating system handles all paging operations: the programmer, for the most part, does not have to consider this. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Unlike virtualmemory, a system virtual machine entitled the user to write privileged instructions in their code. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In some respects, a system virtual machine can be considered a generalization of the concept of virtualmemory that historically preceded it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The page table must supply different virtualmemory mappings for the two processes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Before virtualmemory could be implemented in mainstream operating systems, many problems had to be addressed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory was therefore introduced not only to extend primary memory, but to make such an extension as easy as possible for programmers to use. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory allows a page that does not currently reside in main memory to be addressed and used. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Fixed head disks and drums were particularly effective as paging devices on the early virtualmemory systems. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Segmented virtualmemory is a further generalization of this mechanism to a large number of segments. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Instead, virtualmemory pages in both processes may refer to the same pages of physical memory until one of them writes to such a page: then it is copied. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Similarly, references to virtualmemory locations not present in main memory cause page faults, which again were handled by control program rather than reflected to the virtual machine. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In this case, multiple applications will display the wait cursor as they attempt to access memory that must be paged in until the hard disk and virtualmemory system recover. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A "page table" maps virtualmemory to physical memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory support allows the user to employ the hard disk as a temporary storage space if applications use more memory than exists in the system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. One of the classic developments in computing systems is virtualmemory, a combination of hardware and software that creates the illusion of private memory for each process. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory in the 8088 and 8086 was not supported by the processor hardware, and disk technology of the time would make it too slow and cumbersome to be practical. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This nullifies a significant advantage of virtualmemory, since a single process can not use more main memory than the amount of its virtual address space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Entropy is increased by either raising the amount of virtualmemory area space over which the randomization occurs or reducing the period over which the randomization occurs. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory makes it possible to have a linear virtualmemory address space and to use it to access blocks fragmented over physical memory address space. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This reduces the number of pages accessed by up to a factor of ten for big heaps when using virtualmemory, compared with the traditional implementation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An implementation of virtualmemory on a system using segmentation without paging requires that entire segments be swapped back and forth between main memory and secondary storage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Two concurrent programs might try to access the same virtualmemory address, but the virtualmemory system redirected these requests to different areas of physical memory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In systems that support virtualmemory, a process may be swapped out, that is, removed from main memory and placed on external storage by the scheduler. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Virtualmemory support was introduced in 1985. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This version of the operating system and hardware improved memory management (not true virtualmemory) and increased program size. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When the term virtual was first coined in the computational sense, it applied to things that were simulated by the computer, like virtualmemory. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It was also the first minicomputer to offer virtualmemory, offered as an option by 1969. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Windows 3.0 applications can run in protected mode, which gives them access to several megabytes of memory without the obligation to participate in the software virtualmemory scheme. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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