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Reference.org
Directory-based cache coherence
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<p>In <a href="/facts/Computer_engineering/5x1TRKGo">computer engineering</a>, directory-based cache coherence is a type of <a href="/facts/Cache_coherence/MhUD576q">cache coherence mechanism</a>, where directories are used to manage caches in place of <a href="/facts/Bus_snooping/NUxKS0mb">bus snooping</a>. Bus snooping methods scale poorly due to the use of <a href="/facts/Broadcasting_(networking)/NRj7gHre">broadcasting</a>. These methods can be used to target both <a href="/facts/Computer_performance/td1qKox4">performance</a> and <a href="/facts/Scalability/jh7JomPa">scalability</a> of directory systems. </p>