Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Processor consistency
open-in-new
<p>Processor consistency is one of the <a href="/facts/Consistency_model/a8Xphrs7">consistency models</a> used in the domain of <a href="/facts/Concurrent_computing/yVzQBPr9">concurrent computing</a> (e.g. in <a href="/facts/Distributed_shared_memory/IboHJvt6">distributed shared memory</a>, <a href="/facts/Distributed_transaction/CjCS2nhu">distributed transactions</a>, etc.). </p><p>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. Because of this, processor consistency is only applicable to systems with multiple processors. It is weaker than the <a href="/facts/Causal_consistency/qdwBqVgL">causal consistency</a> model because it does not require writes from <i>all</i> processors to be seen in the same order, but stronger than the <a href="/facts/PRAM_consistency/wPdGFIWH">PRAM consistency</a> model because it requires <a href="/facts/Cache_coherence/MhUD576q">cache coherence</a>. Another difference between causal consistency and processor consistency is that processor consistency removes the requirements for loads to wait for stores to complete, and for Write <a href="/facts/Linearizability/u3pnNCvs">Atomicity</a>. Processor consistency is also stronger than <a href="/facts/Cache_consistency/MhUD576q">cache consistency</a> because processor consistency requires all writes by a processor to be seen in order, not just writes to the same memory location. </p>