![]() ![]() In any case, this mode is more efficient than attach mode since a lot of instrumentation are independent of the profiling settings. If you connect with the same profiling settings, no classes will have to be re-transformed. For maximum efficiency, it’s also possible to append ,config= and ,id= parameters to instruct the profiling agent to take the profiling settings from a particular session in a particular config file. In most cases, this is handled by the integration wizard. This mode is activated by appending ,nowait to the -agentpath VM parameter. In that case, the instrumented classes have to be re-transformed after the JProfiler GUI tells the profiling agent about the profiled classes. This is the most efficient way to profile an application, since no retransforming of already loaded class files has to be performed.Īlternatively, it is possible to let the application start up immediately and connect with the JProfiler GUI at a later time. After the connection, the normal execution in the JVM is continued. The profiling agent pauses the JVM at startup and waits for a connection from the GUI to receive information about profiled classes and other profiling settings. Except for remote sessions, you do not have to choose a port explicitly. You can change that port by appending =port=8849 to the above VM parameter. They also take care of potential other VM parameters that are required for profiling.īy default, the profiling agent listens on port 8849. ![]() For launched sessions and IDE integrations JProfiler does this automatically, for other cases, there are integration wizards. You rarely need to add this JVM parameter manually. This is achieved by adding the special JVM parameter. To profile an application at startup, the profiling agent has to be activated before the JVM is created. To attach to a remote JVM that has not been prepared for profiling, JProfiler offers a command line tool jpenable that loads the profiling agent and makes it possible to connect with a remote session from another computer. Also, to instrument classes, JProfiler has to retransform them, which takes more time and resources compared to the “Profile at startup” mode. JProfiler notifies you in the GUI where this is the case. The fourth mode is used when the use of a JProfiler GUI is not desired or technically possible (“Offline mode”).įor profiling Java 1.6 or higher, JProfiler supportsattaching to arunning JVM and loading the profiling agent on the fly.Īttach mode has some drawbacks since some capabilities of the profiling interface are not available that way. A compromise is to load the profiling agent at startup and tell it later on what the profiling settings should be (“Prepare for profiling”). It is most convenient to simply attach the JProfiler GUI to any running JVM (“Attach mode”), but it is most efficient to load the profiling agent and startup and tell it about the profiling settings immediately (“Profile at startup”). The three GUI modes result from trade-offs between convenience and efficiency. Three of them involve a connection with the JProfiler GUI so you can see and analyze data immediately. There are four different profiling modes in JProfiler. ![]()
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