软件测试LoadRunner面试题: Analysis Scenario (Bottlenecks)

In Running Vuser graph correlated with the response time graph you can see that as the number of Vusers increases, the average response time of the check itinerary transaction very gradually increases. In other words, the average response time steadily increases as the load
　　 increases. At 56 Vusers, there is a sudden, sharp increase in the average response
　　 time. We say that the test broke the server. That is the mean time before failure (MTBF). The response time clearly began to degrade when there were more than 56 Vusers running simultaneously.