What is NV graphics card memory sharing system technology?

Shared memory, also known as graphics card video memory, refers to the large-capacity memory that can be accessed by different CPUs in a multiprocessor computer system. Since multiple CPUs need to access the memory quickly, the memory needs to be cached. As soon as any cached data is updated, the shared memory needs to be updated immediately because other processors may also want to access it, otherwise different processors may use different data.

Shared memory is a communication method between multiple processes under UNIX, which is usually used for multi-process communication of a program, in fact, multiple programs can also pass information through shared memory.

One of the obvious benefits of in-memory communication is that it is efficient, as the process can read and write directly to memory without requiring any copies of the data. For communication methods such as pipelines and message queues, data needs to be copied four times in kernel and user space, while shared memory only copies data twice, once from the input file to the shared memory area, and once from the shared memory area to the output file. In fact, when processes share memory, they don't always read and write a small amount of data and then unmap, and then re-establish the shared memory region when there is new communication.

Instead, the shared area remains shared until communication is complete, so that the data content remains in shared memory and is not written back to the file. Content in shared memory is often written back to the file when it is unmapped.

Graphics card shared memory is the part of memory used by the graphics card when the local video memory is insufficient, and dynamically calls the memory as the video memory. The memory size of the graphics card can be set in the BIOS.

Graphics card: Graphics card (video card, graphics card) is the full name of display interface card, also known as display card, is one of the most basic configuration and important accessories of the computer. As an important part of the computer host, the graphics card is a device for the computer to convert digital-to-analog signals, and undertakes the task of outputting and displaying graphics.

The graphics card is connected to the motherboard of the computer, which converts the digital signal of the computer into an analog signal for the display of the display, and the graphics card still has image processing capabilities, which can assist the CPU to work and improve the overall running speed. For people who are engaged in professional graphic design, graphics cards are very important. The leading manufacturers of graphics chips for civil and military graphics cards include AMD (Supermicro Semiconductor) and NVIDIA (Nvidia).

Today's TOP500 computers all contain graphics card computing cores. In scientific computing, graphics cards are referred to as display accelerator cards.

Memory: Memory is one of the most important components of a computer, it is the bridge to communicate with the CPU. The running of all programs in the computer takes place in memory, so the performance of the memory has a very large impact on the computer.

Memory, also known as internal memory, is used to temporarily store computing data in the CPU and exchange data with external memory such as hard disks. As long as the computer is running, the CPU will transfer the data that needs to be calculated to the memory for calculation, and when the operation is completed, the CPU will send the result out, and the operation of the memory also determines the stable operation of the computer. Memory is made up of parts such as memory chips, circuit boards, gold fingers, etc.

Allocate a portion of the memory to the graphics card as a display cache; The high-quality games of the graphics card must have a separate graphics card to run smoothly, and the computing speed of the integrated graphics card GPU itself is not enough; A good graphics card GPU is even faster than a CPU;

To play the game well, a discrete graphics card is required.

The games that can be played include all card games, chess and cards, and web games; The image quality requirements are not high, or can be adjusted to a low-level, "small and medium" game with a client.

The graphics card onboard video memory is fast but the cost is high, especially the low-end graphics card cannot be used too much, so now divide a part of the memory to the graphics card when needed, the memory is much cheaper than the video memory, but the memory speed is much slower, I haven't played the game you play, it looks like a racing game, it may not be a high demand for video memory. There is no problem playing QQ games, the others are very reluctant.

For graphics cards that share memory, the memory of the graphics card itself is not very high, but you can use the memory as video memory when you need it.

The problem is that the basic low-end graphics cards with shared memory functions are the core performance, and the core performance you can share up to 1G, and the performance is still garbage, not to mention the huge PCI-E bus to the North Bridge, and then to the memory and back again.

The size of the video memory helps to improve the resolution and anti-aliasing. However, the impact on graphics performance is not significant. Overall, there is an improvement in using sharing, but not much. However, if your memory is dual-channel, the boost will be even higher. (Increased bandwidth).