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docs/java-and-java-performance-optimization.md
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# Java and Memory Management
- [Java Performance Optimization](#java-performance-optimization)
- [Benchmarking modern Java Virtual Machines and the next-generation garbage collectors](#benchmarking-modern-java-virtual-machines-and-the-next-generation-garbage-collectors)
- [Relevant JVM Metrics](#relevant-jvm-metrics)
- [Common JVM Errors](#common-jvm-errors)
- [Tuning Jenkins GC](#tuning-jenkins-gc)
- [Tuning Java Containers](#tuning-java-containers)
- [Debugging java applications on OpenShift and Kubernetes](#debugging-java-applications-on-openshift-and-kubernetes)
- [Benchmarking modern Java Virtual Machines and the next-generation garbage collectors](#benchmarking-modern-java-virtual-machines-and-the-next-generation-garbage-collectors)
- [Relevant JVM Metrics](#relevant-jvm-metrics)
- [Common JVM Errors](#common-jvm-errors)
- [Tuning Jenkins GC](#tuning-jenkins-gc)
- [Tuning Java Containers](#tuning-java-containers)
- [Debugging java applications on OpenShift and Kubernetes](#debugging-java-applications-on-openshift-and-kubernetes)
- [List of Performance Analysis Tools](#list-of-performance-analysis-tools)
- [Threadumps, Heapdumps and GC Analysis Tools](#threadumps-heapdumps-and-gc-analysis-tools)
- [Threadumps, Heapdumps and GC Analysis Tools](#threadumps-heapdumps-and-gc-analysis-tools)
- [Garbage Collection and Heap Offloading](#garbage-collection-and-heap-offloading)
- [Java Tracing Tools. JDK Flight Recorder](#java-tracing-tools-jdk-flight-recorder)
- [Cambios importantes en la gestión de memoria de Java 8 de Oracle (2014)](#cambios-importantes-en-la-gestión-de-memoria-de-java-8-de-oracle-2014)
## Java Performance Optimization
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- [Dzone: 7 JVM Arguments of Highly Effective Applications 🌟🌟🌟](https://dzone.com/articles/7-jvm-arguments-of-highly-effective-applications-1) How to use 7 JVM arguments to help increase your application's performance and avoid common memory pitfalls.
- [medium: How to reduce your JVM app memory footprint in Docker and Kubernetes 🌟](https://medium.com/wix-engineering/how-to-reduce-your-jvm-app-memory-footprint-in-docker-and-kubernetes-d6e030d21298)
- [developers.redhat.com: Get started with JDK Flight Recorder in OpenJDK 8u 🌟](https://developers.redhat.com/blog/2020/08/25/get-started-with-jdk-flight-recorder-in-openjdk-8u/) Deploy JDK Flight Recorder with JDK Mission Control, a new monitoring and profiling tool that exposes a high level of information without adding a tax on the runtime system
- [blog.heaphero.io: HeapHero - Java & Android Heap Dump Analyzer](https://blog.heaphero.io/)
- [blog.heaphero.io: What is GC Log, thread dump and Heapdump? 🌟](https://blog.heaphero.io/2020/10/16/what-is-gc-log-thread-dump-and-heapdump/) Java Virtual Machine (JVM) generates 3 critical #artifacts that are useful for optimizing the performance and troubleshooting production problems. Those artifacts & their differences are explained in this PDF.
### Benchmarking modern Java Virtual Machines and the next-generation garbage collectors
* [jet-start.sh: Performance of Modern Java on Data-Heavy Workloads, Part 1 🌟](https://jet-start.sh/blog/2020/06/09/jdk-gc-benchmarks-part1) The Java runtime has been evolving more rapidly in recent years and, after 15 years, we finally got a **new default garbage collector: the G1**. Two more GCs are on their way to production and are available as experimental features: **Oracle's ZGC** and **OpenJDK's Shenandoah**. We at Hazelcast thought it was time to put all these new options to the test and find which choices work well with workloads typical for our distributed stream processing engine, [Hazelcast Jet](https://jet-start.sh/).
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- [DZone: Understanding the Java Memory Model and Garbage Collection 🌟](https://dzone.com/articles/understanding-the-java-memory-model-and-the-garbag) In this article we will try to understand the Java memory model and how garbage collection works. In this article I have used JDK8 Oracle Hot Spot 64 bit JVM. First let me depict the different memory areas available for Java processes.
- [DZone: Memory Leaks and Java Code](https://dzone.com/articles/memory-leak-andjava-code) When you aren't using objects, but they aren't touched by GC, a memory leak happens. Here are six ways memory leaks happen to look for and avoid.
## Java Tracing Tools. JDK Flight Recorder
- [Byteman](https://byteman.jboss.org/)
- [developers.redhat.com: Collect JDK Flight Recorder events at runtime with JMC Agent 🌟](https://developers.redhat.com/blog/2020/10/29/collect-jdk-flight-recorder-events-at-runtime-with-jmc-agent/)
- [developers.redhat.com: Checkpointing Java from outside of Java](https://developers.redhat.com/blog/2020/10/15/checkpointing-java-from-outside-of-java/)
## Cambios importantes en la gestión de memoria de Java 8 de Oracle (2014)
PermGen no pertenece al heap y los objetos no son promocionados a esta sección de memoria gestionada durante un GC. Como bien dices es un espacio contiguo al heap, pero también se limpia cada vez que la tenured/old generation procede a un GC. No es una generación separada del mismo modo que es la young generation, y no hay un mecanismo específico para un GC separado de PermGen. La tenured/old generation y la permanent generation proceden a un GC cuando una de las dos se llena.