Implementation of a Reliable Volunteer Computing System with Credibility-Based Voting

For the purpose of realizing highly-reliable volunteer computing (VC), this paper implements and evaluates a prototype VC system with credibility-based voting. The credibility-based voting is known as an efficient technique for eliminating incorrect calculation results. Although its theoretical performance has studied in detail and is shown to be better than a popular voting method, its real performance has not been evaluated yet. The implemented prototype VC system consists of a management server and a number of worker nodes. In the management server, each process including the credibility-based voting is multithreaded, and all information are managed in a database (DB). It is found by performance evaluations that the credibility-based voting is most time-consuming all processes and the main cause is DB access. It is also shown that the multithreading is effective to reduce the waiting time of the credibility-based voting, thus reducing the overall execution time of VC.