What it a memory cache What principles does it rely on to increase the performance?

Asked By: Serviliana Wyland | Last Updated: 16th April, 2020
Category: technology and computing data storage and warehousing
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Cache memory holds frequently used instructions/data which the processor may require next and it is faster access memory than RAM, since it is on the same chip as the processor. This reduces the need for frequent slower memory retrievals from main memory, which may otherwise keep the CPU waiting.

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In respect to this, what impact does word size have on performance?

A larger word length in a processor does not directly increase the performance of the system, but when dealing with larger (or higher precision) values is required, exponential performance gains can be realized.

Similarly, what are the benefits of cache memory? Advantages. Cache memory is faster than main memory. It consumes less access time as compared to main memory. It stores the program that can be executed within a short period of time.

Beside above, how line size affects the performance of cache memory?

When you increase the cache line size, you decrease the number of compulsory misses required to bring a large object into the cache. For example, it takes a minimum of 32 cache misses to bring a 1024 byte object into a cache with a 32 byte line size.

What is the working principle of cache memory?

Cache memory is an extremely fast memory type that acts as a buffer between RAM and the CPU. It holds frequently requested data and instructions so that they are immediately available to the CPU when needed. Cache memory is used to reduce the average time to access data from the Main memory.

36 Related Question Answers Found

What affects a CPU's performance?

The CPU's FSB speed determines the maximum speed at which it can transfer data to the rest of the system. Other factors affecting data transfer rates include the system clock speed, the motherboard chipset, and the RAM speed.

How can I improve CPU performance?

Here are seven ways you can improve computer speed and its overall performance.
  1. Uninstall unnecessary bloatware.
  2. Limit the programs at startup.
  3. Add more RAM to your PC.
  4. Check for spyware and viruses.
  5. Use Disk Cleanup and defragmentation.
  6. Consider a startup SSD.
  7. Take a look at your web browser.

What is meant by word size?

"Word size" refers to the number of bits processed by a computer's CPU in one go (these days, typically 32 bits or 64 bits). Data bus size, instruction size, address size are usually multiples of the word size.

What is word size in memory?

The hardware registers in a computer machine are word sized. The Word size also defines the largest possible memory address (each memory address points to a byte sized memory). A word is the size of the registers in the processor. This means processor instructions like, add, mul, etc are on word-sized inputs.

What do you mean by word length of a processor?


The word length of the processor in a computer refers to the maximum number of bits it can take as input. It is the number of bits processed by a computer CPU in a single pass. The computer further takes this input for process and gives the output. We have word length as 8. 16.

What do you mean by core?

the central, innermost, or most essential part of anything. Also called magnetic core. Electricity. the piece of iron, bundle of iron wires, or other ferrous material forming the central or inner portion in an electromagnet, induction coil, transformer, or the like.

How big is a word in x86?

There actually are simple The x86 family of CPUs started in 1978 with the 8086 processor. It defined a WORD as 16 bits (two bytes). A DWORD (double-word) was 32 bits (two words, or 4 bytes), and a QWORD (quad-word) was 64 bits (four words, or 8 bytes).

What are the effects of using a processor with more cores?

CPUs with multiple cores have more power to run multiple programs at the same time. However, doubling the number of cores will not simply double a computer's speed. CPU cores have to communicate with each other through channels and this uses up some of the extra speed.

Which parameter decides the size of the cache memory?

Within these hard limits, the factors that determine appropriate cache size include the number of users working on the machine, the size of the files with which they usually work, and (for a memory cache) the number of processes that usually run on the machine.

What is line size in cache?


The chunks of memory handled by the cache are called cache lines. The size of these chunks is called the cache line size. Common cache line sizes are 32, 64 and 128 bytes. A cache can only hold a limited number of lines, determined by the cache size.

What is cache size?

Cache Size is the amount of disk space the pCloud Drive will use to store locally information from the cloud. It should be at least the size of the files you usually work with in the cloud.

How do you calculate cache size?

Calculations
  1. Use the following information if you are told the cache is 4 MB or something similar.
  2. 1 KB = 210 bytes (1024 bytes)
  3. 1 MB = 210 KB (1024 bytes) = 210 * 210 bytes = 220 bytes (1048576 bytes)
  4. Block = log2 (BytesPerLine) = number of bits needed to represent the maximum number (remember to start using a '0' offset).

How do I see a cache block size?

Let's assume the system is byte addressable. Then each cache block contains 8 words*(4 bytes/word)=32=25 bytes, so the offset is 5 bits. The index for a direct mapped cache is the number of blocks in the cache (12 bits in this case, because 212=4096.) Then the tag is all the bits that are left, as you have indicated.

Which would be the best place to cache DNS data?

The answer is DNS cache. DNS cache would be the best place to cache DNS data. A DNS cache or a DNS resolver cache can be considered as a temporary database that is being maintained by a computer's operating system.

When a computer processor does not get a data item that it requires in the cache it is known as?


When a computer processor does not gets data item that it requires in cache, then the problem is known as cache miss. The problem of cache miss is the state when the data requested for processing cannot be found in the system specifically in the cache memory.

What every computer programmer should know about memory?

As we will see, processors are much faster and must wait to access memory, despite the use of CPU caches. If multiple hyper-threads, cores, or processors access memory at the same time, the wait times for memory access are even longer.

Figure 2.9: SDRAM Precharge and Activation.
w 2 CAS Latency (CL)
T T1 Command Rate

Which cache memory is faster?

Level 1 (L1) is the fastest type of cache memory since it is smallest in size and closest to the processor. Level 2 (L2) has a higher capacity but a slower speed and is situated on the processor chip.