Which cache replacement algorithm is better?

Optimal Replacement: The best algorithm is called Bélády’s algorithm because it’ll always discard an item from the cache if it is no longer needed in future.

Which is better LRU or MRU?

Least Recently Used (LRU): This cache algorithm keeps recently used items near the top of cache. Most Recently Used (MRU): This cache algorithm removes the most recently used items first. A MRU algorithm is good in situations in which the older an item is, the more likely it is to be accessed.

Why is the optimal cache replacement policy important?

The performance of any high performance computing system is highly depending on the performance of its cache memory. A better replacement policy allows the important blocks to be placed nearer to the core. Hence reduces the overall execution latency and gives better computational efficiency.

What are the different replacement policies?

Classification/Types of Policies (Timing)

• Constant-Interval Replacement Policy (CIRP)
• Age-Based Replacement Policy (ABP)
• Time-Based Replacement Policy.
• Inspection Replacement Policy (IRP)
• Just-in-Time Replacement Policy (JITP)
• Modified-Age Replacement Policy (MARP)
• Block Replacement Policy (BRP)

What are the four types of replacement algorithm of cache memory?

Vakali describes four cache replacement algorithms HLRU, HSLRU, HMFU and HLFU. These four cache replacement algorithms are history-based variants of the LRU, Segmented LRU, Most Fre- quently Used (expels most frequently requested objects from the cache) and the LFU cache replacement algorithms.

Which replacement algorithm is best and why?

Optimal Page Replacement algorithm is the best page replacement algorithm as it gives the least number of page faults. It is also known as OPT, clairvoyant replacement algorithm, or Belady’s optimal page replacement policy.

Is LRU better than FIFO?

In practice, however, LRU is known to perform much better than FIFO. It is believed that the superiority of LRU can be attributed to locality of reference exhibited in request sequences. They conjectured that the competitive ratio of LRU on each access graph is less than or equal to the competitive ratio of FIFO.

What is optimal replacement policy?

Abstract. The optimal replacement policy is proposed for a new maintenance model of a repairable deteriorating system to minimize the average cost rate throughout the system life cycle. It is assumed that the system undergoes deterioration with an increasing trend of deterioration probability after each repair.