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Currently, CPUs has multiple cores, and each core has its own cache(s). There are some method to make sure the cache consistency like snooping cache consistency protocol and directory based cache consistency protocol. I don't know what my real CPU uses to make sure cache consistency. It is Intel(R) COre(TM) i7-8550U CPU @1.8GHz. Thanks!

Hadi Brais
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jack chan
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    Intel has manuals for that. Which manuals have you downloaded and studied so far? – gnasher729 Jun 23 '18 at 15:28
  • Potential duplicate of [https://stackoverflow.com/questions/49983405/what-is-the-benefit-of-the-moesi-cache-coherency-protocol-over-mesi](https://stackoverflow.com/questions/49983405/what-is-the-benefit-of-the-moesi-cache-coherency-protocol-over-mesi). – Hadi Brais Jun 24 '18 at 03:00
  • Your [4c8t Coffee-Lake CPU](https://ark.intel.com/products/122589/Intel-Core-i7-8550U-Processor-8M-Cache-up-to-4_00-GHz) uses a variant of MESI (called MESIF) over a ring bus. – Peter Cordes Jun 24 '18 at 13:32
  • Thank you! I'm a beginner at hardware things. So thank you all! – jack chan Jun 25 '18 at 14:40

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