Research on methodology of resource availability evaluation in service grid environment
服务网格中资源可用性评估方法研究*

In dynamic grid environment,prediction and evaluation of resource availability are the prerequisite for reasonable resource selection and good QoS guarantee.Based on some related resource and task historical traces,applied probability theory to resource availability prediction and evaluation.Presented the availability metrics including resource off-line time,local task execution time,waiting queue length and waiting time and gave and proved the distribution functions of these metrics.The experiment results show that the prediction is effective,and the amount of candidate resources determined by resource availability evaluation is decreased significantly,therefore lowering time complexity of task scheduling.