What should I monitor in JVM?

Key metrics for monitoring JVM performance

• Heap memory: Heap memory is the memory space that holds all the objects in your application.
• Garbage Collection (GC): Objects created in heap memory become unreferenced after serving their purpose.
• Threads: Threads are responsible for serving user requests.

How do I monitor JVM GC?

The typical CUI GC monitoring method involves using a separate CUI application called “jstat”, or selecting a JVM option called “verbosegc” when running JVM. GUI GC monitoring is done by using a separate GUI application, and three most commonly used applications would be “jconsole”, “jvisualvm” and “Visual GC”.

How do you analyze performance issues in Java?

Monitor the status of threads in the JVM and determine the count of threads in running, blocked and deadlocked state. Use Java performance monitoring tools to help automatically detect blocked threads and deadlocks. Identify the exact module and the line of code at which the locking is happening.

What are JMX metrics?

What is JMX Monitoring? JMX Monitoring is done by querying data from “Managed Beans” (MBeans) that are exposed via a JVM port (JMX console). An MBean represents a resource running inside a JVM and provides data on the configuration and usage of that resource. Typically in a JVM you’ll see multiple domains.

How do I read JMX metrics?

Open the JMX panel to view the metrics.

1. Click Connect in the New Connection dialog. The JMX panel opens.
2. Open the MBeans tab and expand com. genesyslab. gemc. metrics. All of the Web Engagement metrics are there.
3. To refresh the metrics, click Refresh.

What is JVM GC count?

Global Mark Phase Collection Count Indicates the total number of global mark phase collections that occurred during the sample period. This attribute applies to a balanced garbage collection policy. Global Mark Phase Cycle Count Indicates the number of global mark phase cycles that occurred during the sample period.

How do I open GCViewer?

Supported Formats

1. Sun JDK 1.4/1.5 with the options -Xloggc: [-XX:+PrintGCDetails]
2. Sun JDK 1.2.2/1.3.1/1.4 with the option -verbose:gc.
3. IBM JDK 1.3.1/1.3.0/1.2.2 with the option -verbose:gc.
4. IBM iSeries Classic JVM 1.4.2 with option -verbose:gc.
5. HP-UX JDK 1.2/1.3/1.4.x with the option -Xverbosegc.

How do you measure performance of Java application?

In the current article I will try to discuss some guidelines useful to measure performance at the Java application level, independent of any other external systems.

1. Metrics.
2. Warmup Iterations.
3. Variety of platforms.
4. Data-lite performance anti-pattern.
5. Microbenchmark (component level)
6. Macrobenchmark (system level)

How does Java application improve performance?

7 Configurations to Enhance the Performance of Your Java Web Applications

1. Move to the Latest Stable Java Version.
2. Size the Java Heap Memory Correctly.
3. Set the Initial Java Heap Size.
4. Choose the Right Garbage Collection Algorithm.
5. Tune the Garbage Collector.
6. Ensure your Web Container’s Thread Pool is Sized Correctly.

What is JVM suspension?

If you’ve used Dynatrace to analyze the response times of web requests in your environment you may have noticed that some services list a hotspot called Suspension. Suspension time represents the amount of time that requests are suspended by the JVM, CLR, or V8 JavaScript engine during garbage collection activities.

How many JVM metrics do you need to monitor?

One can easily get overwhelmed by the amount of information that you can capture from a running JVM. The fact of the matter is, you don’t need to monitor the hundreds of thousands of metrics. Don’t get me wrong. In order to monitor the availability and performance, you don’t need to monitor every little detail in your application.

What is the CPU utilization of the JVM?

In the graph above, the CPU utilization is less than 1\% so there is no reason for concern. Of course, you can set monitors for each of these metrics in the same way as the JVM memory monitor. The JVM is a complex process that requires monitoring for several key metrics that indicate the health and performance of your running application.

What are JVM parameters and JVM tuning?

JVM parameters or JVM arguments are Java-specific values that change the behavior of the Java Virtual Machine. When it comes to JVM tuning, there are few important parameters you should know as you’ll encounter them when configuring, tuning, and improving overall performance of the JVM.

How to monitor JVM garbage collector performance?

To be able to do that we need to be able to observe what JVM garbage collector is doing. One of the best ways to monitor GC performance is to look at GC logs. You can log GC activity with the following commands: There are also additional JVM parameters important for GC logging.