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To improve Apache or Nginx performance, you can focus on key areas like optimizing modules, adjusting MPM (for Apache), configuring worker processes and connections (for Nginx), enabling compression, caching content, and fine-tuning timeout settings. SSL/TLS optimization and proper logging should also be considered. If you want more detailed guidance, it is better to look into the specific settings that match your server's workload.

Hello Dranzerashu, You can track this using the Native Memory Tracking (NMT) feature. Please refer to this blog to understand NMT: blog.gceasy.io/understanding-native-memory-tracking-in-java/. This feature is in our pipeline for the GCeasy tool and is expected to go live in the early October.

Hello Arnabchowdhry! Question isn't clear. Isn't it just matter of adding new JVM to the existing Load Balancer pool?

@@KousikaManivannan I was refering your videos as you mentioned addiitonal JVM for memory issue , hence asked how can you additonal JVM in an applications ? Maybe I am asking correct desgin

Hello Anthonya! We offer a video course for learning about Java Performance and troubleshooting. For more information, please visit our online training page: ycrash.io/java-performance-training. Also we will be to conducting a live JVM Troubleshooting & Performance Engineering training program for each quarter. This is 3-day training and will be held for 3 hours each day. For more details, visit our blog: blog.gceasy.io/2015/07/17/jvm-performance-engineering-troubleshooting/.

Hello Suraj, There can be a relationship between socket connection issues and the heap memory of an application. Memory Leak, Garbage Collection, and thread management could be the possible ways that might connect socket connection issues and the heap memory of an application. By constantly checking on the application's heap memory, you can make sure your socket connections stay stable and reliable.

As I know, the -XX:MaxMetaspaceSize flag is specific to Oracle's HotSpot JVM and is not typically applicable to other Java Virtual Machine implementations, such as IBM WebSphere Open J9 JVM. For IBM WebSphere Open J9 JVM, you typically manage metaspace settings using different flags or configurations specific to that JVM. IBM provides its own set of flags and configuration options for tuning the JVM, including metaspace settings. You should consult the documentation specific to the version of WebSphere you are using for guidance on how to configure metaspace settings. If you're working with the WebSphere Open J9 JVM and need to manage metaspace, refer to the IBM documentation or contact IBM support for the most accurate and up-to-date information on configuring metaspace settings.

@@prithiekammai9186 I tried alot to find. IBM WebSphere and eclipse Open J9 JVM argument doesn't contain for MetaSpace. If anyone have idea let me know.

When you send an HTTP request using Java from a virtual thread, like with RestTemplate, it depends on how the HTTP client is set up: If it's set to wait for a response (blocking), the virtual thread might wait, and it won't be able to do other things during that time. When the response arrives, there's usually a mechanism in place to wake up the virtual thread so it can continue its work. Some setups allow the virtual thread to keep doing other tasks while waiting for the response, so it doesn't get stuck. In essence, it depends on how the setup is done, but generally, the virtual thread will wait for the response and then continue its work when it arrives.

By design, the VTs are non-blocking. Virtual threads in Java are cooperative, meaning that they are designed to explicitly yield control to other threads when they are blocked, rather than being preemptively paused by the JVM. This cooperative nature allows virtual threads to be very lightweight and efficient. To answer your question, Virtual threads in fact will release the OS threads while waiting. But, during that time, it will not block other threads like OS threads do and will allow other threads to perform and this waiting thread will take very minimal resources. After two minutes, this Virtual threads will be active again to serve the response.

1. Ensure that you are using the latest version of Eclipse MAT. 2. Verify that the heap dump file itself is not corrupted. Try opening the heap dump file with other heap dump analysis tools or try generating a new heap dump to see if the issue persists. 3. If above steps didn't work, You can tryout with another heap dump analysis tool HeapHero : heaphero.io/heap-trial-registration.jsp

Thanks for the answer@@ycrash3227 I finally fixed it editing the MemoryAnalizer.ini file adding the line -vm and under that, another line with the path of my JDK (it has to be higher than JDK 11 to work)

1. What about other 4 heap dump options? Take a look at all 8 heap dump options in this blog: blog.heaphero.io/2017/10/13/how-to-capture-java-heap-dumps-7-options/ 2. MAT is built in or where will I get it? MAT is not built directly into Eclipse IDE by default, but it can be installed as a plugin. You can download and install MAT from the Eclipse Marketplace or directly from the Eclipse website.

​@@ycrash3227 you forget to mention JConsole .

The storage of meta-information in the JVM is essential for supporting dynamic features, reflection, and runtime manipulation of Java programs. It enables the flexibility and adaptability of Java applications by providing the necessary information about classes and objects during runtime.

great. thank you@@ycrash3227

DirectMemory is not the only one region that managed off-heap, it is One Of others. You really can eat a lot off-heap memory by working with large-zip files for example. Any native-code that allocates memory, allocate it in normal process memory - in off-heap. More over, the limit for the direct memory, no matter how it specified (explicitly or implicitly) doesn't mean that it would be reached easily. MaxDirectMemorySize is for applications, that uses direct-buffers actively, for others it's not so important as you can imagine. And at last, you have to monitor and pay attention for RSS, committed memory, not only for virtual space that can be TB or PB ;-)

In my application which is I/O based, I observed that heap memory behaviour is perfect but the main memory is gradually increasing and not releasing. What could be the possibility?

Which part of Java application use directMemory? Is it I/O operations?

Hello Manasnaik! Good Question. To help you get more insights, I've posted your question in yCrash Answers community forum: answers.ycrash.io/question/need-help-with-applications-high-response-time-when-performing-file-operations-to-store-data-in-s3-storage.?q=953 The JVM experts in the community may respond you with their suggestions. Thank you.

@@ycrash3227 thanks