Computer Architecture Simulation & Visualisation

Snoopy Cache Coherence (old)

In a bus-based multiprocessor system, cache coherence can be ensured using a snoopy protocol in which each processor's cache monitors the traffic on the bus and takes appropriate action when it sees a write request being sent to memory for a variable at an address matching one that it holds. This website contains a number of models demonstrating different types of snoopy protocol.

(These models are now deprecated. Four new models can be found at Snoopy Cache Coherence.)

• Copyback / Write Invalidate protocol, for which the model files can be downloaded as a zip file from snoopy_v1.2.zip

• Write Through / Write Invalidate protocol, for which the model files can be downloaded as a zip file from snoopy_v2.2.zip

• Write Through / Write Update protocol, for which the model files can be downloaded as a zip file from snoopy_v3.2.zip

Instructions on how to use HASE models can be found at Downloading, Installing and Using HASE.