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The name weak consistency can be used in two senses. In the first sense, strict and more popular, weak consistency is one of the consistency models used in the domain of concurrent programming (e.g. in distributed shared memory, distributed transactions etc.). A protocol is said to support weak consistency if:
The release consistency model relaxes the weak consistency model by distinguishing the entrance synchronization operation from the exit synchronization operation. Under weak ordering, when a synchronization operation is to be seen, all operations in all processors need to be visible before the synchronization operation is done and the processor ...
Consistency as defined here is sometimes referred to as weak consistency. When we replace convergence in probability with almost sure convergence, then the estimator is said to be strongly consistent. Consistency is related to bias; see bias versus consistency.
The consistency defined above may be called weak consistency. The sequence is strongly consistent , if it converges almost surely to the true value. An estimator that converges to a multiple of a parameter can be made into a consistent estimator by multiplying the estimator by a scale factor , namely the true value divided by the asymptotic ...
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.
Eventual consistency is a weak guarantee – most stronger models, like linearizability, are trivially eventually consistent. Eventually-consistent services are often classified as providing BASE semantics (basically-available, soft-state, eventual consistency), in contrast to traditional ACID (atomicity, consistency, isolation, durability) .
Intense competition, hefty capital spending needs and erratic regulation have made the communications sector an investment minefield. But Comcast Corp (CMCSA) remains a model of consistency ...
For example, a solution to the Weak Byzantine General problem in a synchronous authenticated message passing model leads to a solution for Weak Interactive Consistency. [8] An interactive consistency algorithm can solve the consensus problem by having each process choose the majority value in its consensus vector as its consensus value. [9]