Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
What is the most efficient to share data between multiple cores. Sure you can use shared memory but that also comes at a cost. Say one core is continously writing to a variable and the other core has to continuously read from it. With the MESI cache coherence protocol, the writing core will cause the reading core to invalidate its cache every now and then. So in this scenario, what is the most efficient way of sharing data.
On a typical shared memory machine, the scenario that you describe is probably already the most efficient method that is possible:
Either way, the data must be sent from Core A to Core B. Cache coherency in modern processors will sometimes support direct cache-to-cache transfer without going all the way to memory.
What you want to avoid (whenever possible) is excessive locking of the shared resource. That will increase cache coherency traffic (and latency) in both directions.