![]() ![]() The Garbage Collection Telemetry view shows detailed information about the garbage collector in the JVM.The Memory Telemetry view is generally used to display the allocation and usage of heap memory and non-heap memory.Some tools can also display the CPU usage of each thread in the application. The CPU Telemetry view is generally used to display the CPU usage of the entire application.There are usually multiple views (View) that display CPU usage, memory usage, thread status, and other useful information in real time, so that users can quickly find the key to the problem. Telemetry: Telemetry is the easiest way to view the running behavior of an application. ![]() This section first introduces these basic functions. Profiler tool function introductionĪlthough there are many Java Profiler tools on the market, the basic functions are mostly similar. The information collection method used by the Java Profiler tools currently on the market is usually any combination of the above three methods. However, this method has certain advantages in the trajectory of the statistical program. This method will have a certain impact on the program execution speed, so the given program execution time may be inaccurate. The method of implanting additional instructions (BCI): This method inserts instruction codes in the target program, these instruction codes will record the information required for profiling, including the running time, the value of the counter, etc., so as to give a more accurate memory usage, Function call relationship and CPU usage information of the function.Since the information of the call stack is obtained at regular intervals, it is not very accurate, but because this method has less interference to the target program, the running speed of the target program is almost unaffected. Statistical sampling method (sampling): This method calls system interrupts at regular intervals, and then collects the current call stack information, records the functions appearing in the call stack and the call structure of these functions, and obtains the function calls based on this information Relationship graph and CPU usage information of each function.Event method: For Java, you can use JVMTI (JVM Tools Interface) API to capture events such as method invocation, class loading, class unloading, thread entry/leaving, and then analyze program behavior based on these events.There are three main methods for collecting program runtime information: Its purpose is to locate the part of the program that needs to be optimized, thereby improving the running speed of the program or the efficiency of memory usage. This article is mainly divided into three parts: The first part briefly introduces the principle of the Java Profiler tool the second part briefly introduces the current common Java Profiler tools TPTP, CodePro Profiler, YourKit Java Profiler, and JProfiler the third part gives a brief introduction to the above tools Comparison of angles to help developers choose the right tool.ĭevelop and deploy your next application on the IBM Bluemix cloud platform.Ĭompared with static code analysis, Profiling is a dynamic analysis method that studies program behavior by collecting information at runtime. This article will briefly introduce several common tools and compare them from the perspectives of function and performance to help Java programmers choose the appropriate Java Profiler tool. There are many types of Java Profiler tools currently on the market. The Java Profiler tool can help developers locate these problems quickly and effectively, and therefore has become an important tool in the Java development process. During the development of Java programs, problems such as memory usage and performance bottlenecks will inevitably be encountered. ![]()
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