Cache Optimization: Does It Matter? Should I Worry? Why?

As developers, we are quite familiar with the concept of “caching”. Operating systems, databases, file systems, even our own software creations all use some sort of cache. But what about CPU caches in modern processors? Are they any different?

This white paper is a must read if you have not considered how memory caches impact coding decisions.  It includes several cache optimization examples to help define realistic expectations regarding “CPU Cache Optimization”. Caching is done automatically regardless of how you program. However, the questions to ask yourself are:

  • How much faster could my program be if it were written in such a way that cache access is considered and optimized? 
  • How many fewer servers will I need?
  • And, is it really a million dollar IT budget question?

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