Performance test is to test various performance indexes of the system by simulating a variety of normal, peak and abnormal load conditions through automatic test tools. Both load test and stress test belong to performance test, which can be carried out in combination. Through the load test, the performance of the system under various workload is determined. The goal is to test the changes of various performance indexes of the system when the load gradually increases. Stress testing is a test to obtain the maximum service level that the system can provide by determining the bottleneck or unacceptable performance point of a system.