What are the most common cache replacement algorithms?

What are the most common cache replacement algorithms?

The most widely used cache replacement algorithms include Least Recently Used (LRU), Least Frequently Used (LFU), LRU-Min [5], LRU-Threshold [5], Pitkow/Recker [447], SIZE [552], Lowest Latency First [564], Hyper-G [552], Greedy-Dual-Size (GDS) [102], Hybrid [564], Lowest Relative Value (LRV) [467], LNC-R-W3 [492].

Which replacement policy used by the cache memory?

The Least Frequent Recently Used (LFRU) cache replacement scheme combines the benefits of LFU and LRU schemes. LFRU is suitable for ‘in network’ cache applications, such as Information-centric networking (ICN), Content Delivery Networks (CDNs) and distributed networks in general.

What is a replacement policy use for?

An obvious page replacement policy is to replace the page that has not been used for the longest time, the least-recently used, LRU, policy. The rationale for this is that pages that have been referenced in the near past are likely to be referred to in the near future so it is desirable to keep them in main memory.

Why is LRU better?

LRU is, in general, more efficient, because there are generally memory items that are added once and never used again, and there are items that are added and used frequently. LRU is much more likely to keep the frequently-used items in memory. Depending on access patterns, FIFO can sometimes beat LRU.

How does Linux pick a victim Page for replacement?

Linux uses the unused portions of memory for file caching, and it cleans up the space when needed. My question is about how it picks a victim page for replacement?

How to check what scheduling algorithms does Linux kernel use?

If you just want to check what scheduler your linux system is using and which are available you can run the following command: The one between the [] is the one it’s using at the moment. The other ones are available. To change it: Be carefull to set it back to default though, unless you know what you are doing and want.

Which is variant of LRU for page replacement?

It includes a brief description of Linux page replacement. The “variant of LRU” is named as “the 2Q [two-queue] approach for database management”, a number of references are provided, and there is a diagram illustrating movement between the two queues and other state transitions.

How to find out more about the Linux kernel?

To find out more about the Linux kernel, you can download the kernel source code (or browse it online) and look in the Documentation directory. For example, the scheduler subdirectory might be helpful. You can also just look at the code itself, obviously.