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calculating and storing data
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What is the difference between cache vs cold cache vs hot cache vs warm cache vs cache hit vs cache miss?
Firstly, it sounds like you are asking for general definitions, rather than differential definitions, which is problematic when the definitions are differential and context specific. Cache miss: not in cache, must be loaded from the original source Cache hit: was loaded from cache (no implication of what "type" of cache was hit). cold cache: The slowest cache hit possible. The actual loading mechanism depends on the type of cache (CPU cache could refer to an L2 (or L3) hit, disk cache could refer to a RAM hit on the drive, web cache could refer to a drive cache hit) hot cache: The fastest cache hit possible. Depends on mechanism described (CPU could be L1 cache, disk could be OS cache hit, web cache could be RAM hit in cache device) Warm cache: Anything between, like L2 when L1 is hot and L3 is cold. It is a less precise term and often used to imply "hot" when the performance is closer to "cold."
How is the power of processors measured?
The power of processors (computers) are generally measured in MIPS, or Million Instructions Per Second. However, this is a subjective term because it depends on the instruction mix, cache hit/miss ratio, processor versus cache versus memory speed, and various other factors. Benchmark tests for processors are very complex, diverse, and relatively standardized so that useful comparisons can be made from them.
What is cache hit and cache miss?
Type your answer here... in cache memory when the CPU refer to the memory and find the word in cache it is said to be hit or produced....... if the word is not found in cache it is in main memory it counts as a miss
What is the size of L1 and L2 cache?
Usually the size of the L2 cache will be larger than the L1 cache so that if data hit in L 1 cache occurs, it can look for it in L 2 cache.. If data is not in both of the caches, then it goes to the main memory...
What is the objective of cache only memory architecture?
Cache memory is the high speed memories which are repeatedly requested by the Cache client (CPU). Whenever the requested data from the cpu is present in the cache, it directly supply the data and is known as cache hit(fast) and when the data is not accessible in cache then cache access the block of the main memory and feed to the CPU and it is termed as cache miss (slow).
Why it is possible to achieve a high hit rate with a relatively small amount of cache?
Well, cache hit rate isn't always determined by the size of the cache. If the cache is inefficient, or if the processor is clocked too far out of stability, the hit rate can decrease. Same as such in the inverse-- If you have cache functioning at near perfection and the processor is clocked properly, the cache hit rate will be reasonably high. High miss rates are most often caused by having too little cache, but the two above mentioned things have an impact too. A small cache isn't bad-- if it is enough. Processing aims for simple-instruction hit rate at least 97%. Misses beyond this have an increasingly heavy impact on performance. 3 misses out of 100 is a bit rough when you consider how many billions of cycles a second a processor goes through.
What is the relationship between a computer's CPU speed CPU cache and it's main bus speed with regard to the computer's performance?
For bulk memory-to-memory copy, the main bus bandwidth will dominate, and the other components must be able to keep up (to saturate the bus and the storage components behind it). For single-byte random reads, latency will dominate. We want read requests put on the main bus to be satisfied with low latency, but inevitably several CPU cycles will go past (stalls will happen) before the request is satisfied. A larger cache may be able to reduce the number of such requests, but the cache hit ratio is very very sensitive to the application workload, and in the worst case we will see a low cache hit ratio with extra latency while we suffer the expense of a large cache.
What is the data found in the cache is called?
The data found in the cache is called cache data. It typically consists of recently accessed or frequently used instructions or data that are stored in a smaller and faster memory area for quicker access by the processor.
What is the impact of cache miss on system performance?
A cache miss is where the processor requests a memory transfer, and that data is not in cache. This requires the bus interface unit to perform a slow access to memory, as opposed to a fast access to cache, or it requires the cache manager to make disk accesses, which can be millions of times slower than main memory. Depending on the cache level, a consistently high percentage of cache misses can impact performance significantly. This is most often seen in low physical memory machines, where the swap file hit-miss ratio is poor. The working set is the memory that is most recently used. Ideally, you want short-term working set to always be smaller than physical memory. Since working set is hard to measure, you can use commit charge, though that is not as accurate. You want commit charge for currently active applications plus kernel memory to be less than physical memory.
How do you trash the cache?
If you mean the DNS Resolver Cache, Windows XP Users can "clear" this cache by clicking on the "start" button, click, "run" and enter "cmd" in the box. a new window will appear with a black background. In this window, enter, "ipconfig/flushdns" (without the quotes) and hit Enter. You should get a prompt that states, "Successfully Flushed The DNS Resolver Cache". This should speed up your internet browsing a little bit.
Is cache memory a removable memory?
No, a cache memory is often used to store data that has been needed recently on grounds that it will be faster to access when/if it is needed again. When data that is requested is contained in the cache you have a cache hit, and when you have to retrieve it from the hard drive (or where ever its original storage was) again it is called a cache miss. Retrieving data from the hard drive is slower than retrieving it from the cache.
Can a direct mapped cache sometimes have a higher hit rate than a fully associative cache with an LRU replacement policy?
Yes. Now do your assignment yourself like everyone else.
