Cache writing strategies are methods used to manage how data is written to a cache and subsequently to the backing store. Here are some common cache writing strategies:
1. Write-Through
In the write-through strategy, data is written to both the cache and the backing store simultaneously. This ensures data consistency between the cache and the backing store but can introduce latency since every write operation involves two writes.
Advantages: Ensures data consistency, simple to implement.
Disadvantages: Higher write latency due to dual writes.
2. Write-Back
In the write-back strategy, data is initially written only to the cache. The write to the backing store is deferred until the cache line is evicted or replaced. This can improve write performance but introduces complexity in tracking which cache entries are "dirty" (modified but not yet written to the backing store).
Advantages: Improved write performance, reduced write operations to the backing store.
Disadvantages: Risk of data loss if the cache fails before the data is written to the backing store, more complex implementation.
3. Write-Around
In the write-around strategy, data is written directly to the backing store, bypassing the cache. The cache is only updated on subsequent read operations if the data is requested.
Advantages: Reduces cache pollution with data that may not be read soon.
Disadvantages: Can lead to higher read latency if the data is read shortly after being written....
