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Writes performed by a process are immediately visible to that process. Slow consistency is a weaker model than PRAM and cache consistency. Example: Slow memory diagram depicts a slow consistency example. The first process writes 1 to the memory location X and then it writes 1 to the memory location Y.
A change to the memory consistency model (AArch64 only); to support the (non-default) weaker RCpc (Release Consistent processor consistent) model of C++11/C11 (the default C++11/C11 consistency model was already supported in previous ARMv8). ID mechanism support for larger system-visible caches (AArch64 and AArch32).
There are several memory-consistency models for SMP systems: Sequential consistency (all reads and all writes are in-order) Relaxed consistency (some types of reordering are allowed) Loads can be reordered after loads (for better working of cache coherency, better scaling) Loads can be reordered after stores; Stores can be reordered after stores
data is stored only in one cache but the data in memory is not updated (invalid, not clean). O =Owner or SD =Shared Dirty or SM =Shared Modified or T =Tagged. modified, potentially shared, owned, write-back required at replacement. data may be stored in more than a cache but the data in memory is not updated (invalid, not clean).
The alternative definition of a coherent system is via the definition of sequential consistency memory model: "the cache coherent system must appear to execute all threads’ loads and stores to a single memory location in a total order that respects the program order of each thread". [4]
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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.
A release consistency example implemented by post-wait synchronization. Post-wait synchronization is another implementation form of release consistency. As shown in the code to the right, correctness can be ensured if post operations occur only after all memory access are complete, especially the store to ‘a’.