These are the rules which specify what different concurrent read/write memory accesses from different threads/processes can or cannot see.
Notable such set of rules include:
- C++ memory model. These are also reflected on the semantics of memory of the corresponding instruction set architecture
- SQL transaction isolation level
That's what usually fucks up parallel programs.
- superuser.com/questions/133082/what-is-the-difference-between-hyper-threading-and-multiple-cores/995858#995858
- stackoverflow.com/questions/680684/what-are-the-differences-between-multi-cpu-multi-core-and-hyper-thread/73405312#73405312
- unix.stackexchange.com/questions/88283/so-what-are-logical-cpu-cores-as-opposed-to-physical-cpu-cores/739296#739296
Hyperthreding is the Intel brand-name, TODO generic name.
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