Installing the Tools for Tuning in Java Draw barcode 128 in Java Installing the Tools for Tuning UPC-A Supplement 5 for .NET

Installing the Tools for Tuning using barcode development for none control to generate, create none image in none applications.upc-a generation .net By means of the Heap Dump, y none none ou can check the number of object instances created at any time and even inspect the content of the single instance fields thus making VisualVM a valuable option also for inspecting the status of applications deployed.. iOS The Threads tab The Threads tab displays a t none none imeline of current thread activity. You can click a thread in the Timeline to view details about that thread in the Details tab:. [ 32 ]. 2 . A Timeline for each thread p rovides a quick overview of the thread"s activity. The drop-down list enables you to select which threads are displayed. You can choose to view all threads, live threads, or finished threads.

You can also select a single thread or multiple threads to display a subset of the threads. The Details tab displays more detailed information about individual threads. For each thread, the name, classname, and current status (alive/finished) are displayed.

A short description of the thread is also provided. As a side note you can also take a Thread Dump (stack trace) while a local application is running. Taking a Thread Dump does not stop the application.

When you print the Thread Dump you get a printout of the thread stack that includes thread states for the Java threads. This can look a bit cumbersome compared to VisualVM simple statistics but it can be still useful if you have any console script which analyzes the output of the Java stack trace..

The Profiler tab The Profiler option requires quite a lot of resources from your machine so it is not enabled by default. When you start a profiling session, VisualVM attaches to the local application and starts collecting profiling data. When profiling results are available they are automatically displayed in the Profiler tab.

You can choose from the following profiling options: CPU Profiling: Choose this to profile the performance of the application. Memory Profiling: Choose this to analyze the memory usage of the application. The results display the objects allocated by the application and the class allocating those objects.

. The following image depicts none none a Memory Profiling session: start by clicking on the Memory button which will begin the Profiler Session. This activity is quite costly for your CPU so it"s likely that your PC will freeze for a while until the initialization is complete..

[ 33 ]. Installing the Tools for Tuning When data profiling is start ed, you will see the first results in the Profiling results table which shows the impact on memory (or on CPU if you are profiling the CPU) of each class allocation:. If you are not interested in none none knowing the details of all the objects created, then you can filter by package (or Classes too) in the lower section of the table.. Collecting snapshots A Snapshot is a handy featur none for none e of VisualVM which allows you to capture application data and save it to your local system for later use. The advantage of using Snapshots is that the target application does not need to be running so that they can be viewed by any user. VisualVM distinguishes between two types of snapshot: Profiler Snapshot Application Snapshot.

Profiler snapshots, as the n ame implies, are generated when you are running a Profiler session. A Profiler snapshot either contains data for allocated objects (if you are running a Memory profiler session) or application performance data (if you are running a CPU profiler session)..

[ 34 ]. 2 . To take a snapshot, simply click the Snapshot button in the Profiler tab. Once taken, the collected sn apshot will be included within the application server tree, as shown by the following image:. An application snapshot is a none for none bit more complex as it contains all the collected Heap Dumps, Thread Dumps and profiler snapshots of an application at the moment the snapshot is taken. An application snapshot also captures general information about the Java Virtual Machine (JVM)..

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