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Strict consistency is the strongest consistency model. Under this model, a write to a variable by any processor needs to be seen instantaneously by all processors. The strict model diagram and non-strict model diagrams describe the time constraint – instantaneous.
Additionally, strict consistency may produce results lacking coherence and completeness. While a philosophical system may demonstrate rigorous consistency with the facts it considers, all facts must be taken into consideration for an adequate criterion of truth, regardless of their detriment to any given system. [6]
Processor consistency is one of the consistency models used in the domain of concurrent computing (e.g. in distributed shared memory, distributed transactions, etc.).. A system exhibits processor consistency if the order in which other processors see the writes from any individual processor is the same as the order they were issued.
Strong consistency is one of the consistency models used in the domain of concurrent programming (e.g., in distributed shared memory, distributed transactions). [1] The protocol is said to support strong consistency if: All accesses are seen by all parallel processes (or nodes, processors, etc.) in the same order (sequentially)
Weak consistency (reads and writes are arbitrarily reordered, limited only by explicit memory barriers) On some CPUs Atomic operations can be reordered with loads and stores. [14] There can be incoherent instruction cache pipeline, which prevents self-modifying code from being executed without special instruction cache flush/reload instructions.
A consistency proof is a mathematical proof that a particular theory is consistent. [8] The early development of mathematical proof theory was driven by the desire to provide finitary consistency proofs for all of mathematics as part of Hilbert's program .
Linearizability was first introduced as a consistency model by Herlihy and Wing in 1987. It encompassed more restrictive definitions of atomic, such as "an atomic operation is one which cannot be (or is not) interrupted by concurrent operations", which are usually vague about when an operation is considered to begin and end.
Sequential consistency is a consistency model used in the domain of concurrent computing (e.g. in distributed shared memory, distributed transactions, etc.).. It is the property that "... the result of any execution is the same as if the operations of all the processors were executed in some sequential order, and the operations of each individual processor appear in this sequence in the order ...