shared-memory - definition. What is shared-memory
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%ما هو (من)٪ 1 - تعريف

XShm; MIT SHM; MIT Shared Memory Extension

Shared memory         
  • MMU]] of the CPU and the [[IOMMU]] of the GPU have an identical pageable virtual address space.
MEMORY THAT MAY BE SIMULTANEOUSLY ACCESSED BY MULTIPLE PROGRAMS WITH AN INTENT TO PROVIDE COMMUNICATION AMONG THEM OR AVOID REDUNDANT COPIES
Shared memory (interprocess communication); SHM (computer science); SHM (computing); Shared Memory; Universal Memory Architecture; Dev/shm; Shared memory programming; Shared Memory Architecture; Shared-memory architecture; Globally shared memory; Shared-memory; Shared-memory multiprocessor; Shared memory system; /dev/shm; Shared code; Shared data; Shared code segment; Shared data segment; Shared memory architecture
In computer science, shared memory is memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them or avoid redundant copies. Shared memory is an efficient means of passing data between programs.
shared memory         
  • MMU]] of the CPU and the [[IOMMU]] of the GPU have an identical pageable virtual address space.
MEMORY THAT MAY BE SIMULTANEOUSLY ACCESSED BY MULTIPLE PROGRAMS WITH AN INTENT TO PROVIDE COMMUNICATION AMONG THEM OR AVOID REDUNDANT COPIES
Shared memory (interprocess communication); SHM (computer science); SHM (computing); Shared Memory; Universal Memory Architecture; Dev/shm; Shared memory programming; Shared Memory Architecture; Shared-memory architecture; Globally shared memory; Shared-memory; Shared-memory multiprocessor; Shared memory system; /dev/shm; Shared code; Shared data; Shared code segment; Shared data segment; Shared memory architecture
1. Memory in a parallel computer, usually RAM, which can be accessed by more than one processor, usually via a shared bus or network. It usually takes longer for a processor to access shared memory than to access its own private memory because of contention for the processor-to-memory connections and because of other overheads associated with ensuring synchronised access. Computers using shared memory usually have some kind of local cache on each processor to reduce the number of accesses to shared memory. This requires a {cache consistency} protocol to ensure that one processor's cached copy of a shared memory location is invalidated when another processor writes to that location. The alternative to shared memory is message passing where all memory is private to some particular processor and processors communicate by sending messages down special links. This is usually slower than shared memory but it avoids the problems of contention for memory and can be implemented more cheaply. 2. Memory which can be access by more than one process in a multitasking operating system with memory protection. Some Unix variants, e.g. SunOS provide this kind of shared memory. Unix manual pages: shmop(2), shmctl(2), shmget(2). (1994-10-20)
Shared universe         
  • Fawcett]] "universe".
FICTIONAL UNIVERSE IN WHICH WORKS WRITTEN BY MULTIPLE WRITERS ARE SET
Shared world; Shared fictional universe; Combined universe; Shared Universe; List of shared universes; Cinematic universe; Shared uiniverse; Film universe; Television universe
A shared universe or shared world is a fictional universe from a set of creative works where more than one writer (or other artist) independently contributes a work that can stand alone but fits into the joint development of the storyline, characters, or world of the overall project. It is common in genres like science fiction.

ويكيبيديا

MIT-SHM

The MIT Shared Memory Extension or MIT-SHM or XShm is an X Window System extension for exchange of image data between client and server using shared memory (usually /dev/shm). The mechanism only works when both pieces are on the same computer.

The basic capability provided is that of shared memory XImages. This is essentially a version of the ximage interface where the actual image data is stored in a SysV shared memory segment, and thus need not be transferred across the socket to the X server. For large images, use of this facility can result in some real performance increases.

Additionally, some implementations provide shared memory pixmaps. These are two-dimensional arrays of pixels in a format specified by the X server, where the image data is stored in the shared memory segment. Through use of shared memory pixmaps, it is possible to change the contents of these pixmaps without using any Xlib routines at all. Shared memory pixmaps can only be supported when the X server can use regular virtual memory for pixmap data; if the pixmaps are stored in the on-board memory of graphics hardware, an application will not be able to share them with the server.

In the 1.15 release of the X.org server the MIT-SHM extension gains two additional requests: 'X_ShmAttachFd' and 'X_ShmCreateSegment', to be able to pass shared memory through file descriptors from client to server and from server to client, reducing the number of copy operations further.

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