PCS - Part 2: Multiprocessor Architectures
PCS - Part 2: Multiprocessor Architectures
PCS - Part 2: Multiprocessor Architectures
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Shared Memory and Caching<br />
Caches are used in order to release network and main<br />
memory from frequent data transfer<br />
Non–shared data can be kept in caches for a long time<br />
without interaction with main memory<br />
This improves scalability of the system, but introduces a<br />
consistency problem. This problem is solved by cache<br />
coherency protocols.<br />
Consistency problem:<br />
P1<br />
Consistent<br />
P2<br />
P1<br />
Inconsistent<br />
P2<br />
Write 23, 2500<br />
23: 1000<br />
23: 1000<br />
23: 1000<br />
23: 2500<br />
23: 1000<br />
23: 1000<br />
23: 2500<br />
after "write−back"<br />
Peter Sobe<br />
<strong>PCS</strong> - <strong>Part</strong> 2: <strong>Multiprocessor</strong> <strong>Architectures</strong>
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