Hosting web - 290 CHAPTER 10 JAVA EE PERFORMANCE ASSESSMENT
290 CHAPTER 10 JAVA EE PERFORMANCE ASSESSMENT Figure 10-11. Requests sorted by their total response times Once you have identified service requests that require deeper diagnostics, the next step is to view their call traces, or open them in a call tree view. From these call trees you want to determine the following: What is the hot path through a request? What is the hot point within that hot path? The hot path reveals the slow path through the code: what path did the request follow from initially receiving the request to its slowest method? The hot point identifies the slowest method in the request. In order to identify the hot path and hot point, you need to sort the method response time data by different values: Average cumulative time: This is the amount of time spent inside of a method in addition to all methods that it called out to. Sorting by average cumulative time reveals the hot path through a request. Average exclusive time: This is the amount of time spent only in a method (and does not include any time spent in methods that it called out to). Sorting by average exclusive time reveals the hot point in a request. Figure 10-12 shows a view of a request tree sorted by the average cumulative time.
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