What is the Full Form of LFU?
The Full Form of LFU is Least Frequently Used.
LFU is a cache algorithm utilised for a computer’s memory optimisation. Within the algorithm, the system maintains a track on the number of blocks referred to in the memory. If the cache memory is full and seeks more room, then an item with reference frequency that is pretty low is deleted. Meanwhile, three functions are executed by LFU, and they are listed below:
- Insert or set
- Pull up or retrieve
- Remove or delete
Applications of LFU
- Assign a counter to each block that reflects in the memory
- Every time that the block reappears, the counter is also added one by one
- Once the cache memory is filled, we need to insert a new block or new value
- Then delete the block that has the minimum counter value from the cache memory
- Once the block is eliminated from the cache memory, the counter for that block is initialised to zero
Features of LFU
- FIFO (that is the first in first out) method is applicable
- Minimum Heap can be employed to implement this algorithm in logarithmic time complexity
- Very systematic in the cases wherein the access pattern cache memory remains almost the same
LFU Benefits
- During data repetition, LFU is used to find an item
- A word in the mobile keyboard is suggested using LFU
- After some time, LFU goes on to suggest regularly used words
- In LFU old page along with frequency is checked for that page
LFU Limitations
- Because the count of new items set into the cache is less, they will be erased soon but are also used more often
- Belady’s anomaly can take place
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