DDR Support for Virtual Threads in JDK 21
DDR (Direct Dump Reader) is a Java implementation of the DTFJ (Diagnostic Tooling Framework for Java) API. It works by walking the J9 structures inside a dump to extract the VM and application state. It’s…
Category: OpenJ9
Deploying on OCP 4.13 With OpenJ9 CRIU Support
The Deploying on Kubernetes and OpenShift with OpenJ9 CRIU Support blog post (which is now out of date) showed how to deploy on OpenShift Container Platform (OCP) using OpenJ9 CRIU Support. Since that time however,…
Optimizing OpenJ9’s Balanced GC Policy for Throughput with Dynamic Breadth First (DBF) Scan Ordering
Optimizing application throughput continues to be a primary goal for any application developer seeking improved application performance. Before I can talk about the details of DBF scan ordering, there are some terms and concepts that…
OpenJ9 Debug Images
Most OpenJ9 platforms create debug images as part of the build, automatically on jenkins or when running make all. These are overlays to the JDK which add additional debug information for native debuggers, such as…
OpenJ9 JCL Preprocessor (JPP) is extended to the extensions for OpenJDK
OpenJ9 has been using the JPP to produce a custom set of libraries from a single JCL codebase since its inception. The customized libraries are used to build OpenJ9 JDKs. Initially, only the OpenJ9 JCL…
Serverless Deployment with OpenJ9 CRIU Support
Overview A previous blog post described how to deploy unprivileged containers that restore an application that checkpointed itself using OpenJ9 CRIU Support on Kubernetes. This post goes over how to build a simple Spring Boot…
Serverless Deployment with OpenJ9 CRIU Support
Overview A previous blog post described how to deploy unprivileged containers that restore an application that checkpointed itself using OpenJ9 CRIU Support on Kubernetes. This post goes over how to build a simple Spring Boot…
OpenJ9 CRIU Support: A look under the hood (part II)
Introduction In this blog post, we continue to look under the hood of OpenJ9’s CRIU support by examining some ways in which a Java application and the JVM can cooperate to ensure a successful restore…
OpenJ9 CRIU Support: A look under the hood
A recent blog post on OpenJ9 CRIU support introduced the motivations and concept of this new feature. In this blog post, we delve deeper into the support built for this feature in the OpenJ9 JVM…
Deploying on Kubernetes and OpenShift with OpenJ9 CRIU Support
The previous blog post showed how to restore an application that checkpointed itself using OpenJ9 CRIU Support in an unprivileged container. This blog post will go over how deploy these containers in Kubernetes (K8s) and…