Abstract
In this paper, snoopy cache coherence protocols with update strategy have been studied, since description of protocols is apparently different in references, so we offer a common description in order to show simplicity and comparability protocols. Evaluating of protocols is in simulation level By limes simulator tools. Limes includes dragon protocol [1], that we added WTU and firefly protocols to it. As the simulation results show, precision of block sharing information in multiprocessor system, is major reason for different performance of update snoopy cache coherence protocols, so if this information amount to be high, then performance will be high, but on the other hand, implementation cost will be high, as well.
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