Memory Consistency: Taking it to the Compiler

This lecture delves into memory consistency, distinguishing between coherence and consistency, and reviewing concepts like sequential consistency and processor consistency. It explores weak consistency, its implications in real CPUs like ARM, and the challenges of preventing re-ordering in programming. The instructor discusses the importance of language-level consistency, highlighting the need for end-to-end guarantees in memory ordering. The lecture also covers the implications of data race free programming, the Java Memory Model, and the C++11 Memory Model. Additionally, it explains the use of atomic variables, synchronization variables, and memory ordering in OpenMP. The session concludes with a summary emphasizing the significance of writing data race free programs.