Cache-Friendly vs. Cache-Unfriendly Code: What's the Difference and How to Write Efficient Code?

What 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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