


Cache-Friendly vs. Cache-Unfriendly Code: What's the Difference and How to Write Efficient Code?
Dec 29, 2024 am 08:28 AMWhat is the Difference Between "Cache Unfriendly Code" and "Cache Friendly" Code?
When data is accessed frequently, it is desirable to store it in a cache for faster access. However, if data is accessed in a way that conflicts with the way the cache works, performance can suffer.
Cache-unfriendly code accesses data in a way that does not take advantage of cache memory. This can happen when data is accessed in a non-sequential way, or when data is accessed from multiple threads simultaneously.
Cache-friendly code accesses data in a way that maximizes the use of cache memory. This means accessing data in a sequential way, and avoiding accessing data from multiple threads simultaneously.
How to Write Cache-efficient Code?
Here are some tips for writing cache-efficient code:
- Use appropriate C containers.
- Don't neglect the cache in data structure and algorithm design.
- Know and exploit the implicit structure of data.
- Avoid unpredictable branches.
- Avoid virtual functions.
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