can not adapt to dynamic load of a data center.To address this issue
an adaptive waiting time threshold model was proposed.Based on this model
an adap-tive delay scheduling algorithm(ADS) was designed.ADS adjusts jobs’ waiting time threshold dynamically to reduce the job response time
according to the information of idle servers’ arrival intensity
available network bandwidth and job running status.A prototype system using ADS was developed
on which the validation of the adaptive waiting time threshold model and the evaluation of ADS’s performance were carried out.It is shown that ADS outperforms previous delay scheduling algorithms in term of the job response time.