@techreport{TR-IC-08-35, number = {IC-08-35}, author = {Gustavo M. D. Vieira and Luiz E. Buzato}, title = {The Performance of Paxos and Fast Paxos}, month = {December}, year = {2008}, institution = {Institute of Computing, University of Campinas}, note = {In English, 16 pages. \par\selectlanguage{english}\textbf{Abstract} Paxos and Fast Paxos are optimal consensus algorithms that are simple and elegant, while suitable for efficient implementation. In this paper, we compare the performance of both algorithms in failure-free and failure-prone runs using Treplica, a general replication toolkit that implements these algorithms in a modular and efficient manner. We have found that Paxos outperforms Fast Paxos for small number of replicas and that collisions are not the cause of this performance difference. } }