A Strategy of QoS Optimization for Web Services

To ensure the performance of software systems based upon service-oriented architecture (SOA), quality of service (QoS) is documented as a service-level agreement (SLA) with official commitments specified for both service consumers and providers to follow. As part of an overall framework developed to predict and prevent SLA violation, this paper proposes a novel strategy that uses combined global and local searching to help service providers in achieving design optimum without overprovision of resources. Experimental results demonstrate that the proposed method outperforms other commonly used methods in search efficiency while retaining competitive with those methods in optimization accuracy.