Copyforward&Mark Hybrid Collector

Background Xgcpolicy:balanced Open J9’s Balanced GC policy is a region based, incremental generational collector, unlike the default generational concurrent policy (gencon), which is probably best suited for the most traditional java application, Balanced GC is designed to be used on large heap to reduce maximum pause times. In Balanced GC The Java heap is divided…

Save Money with JITServer on the Cloud – an AWS Experiment

With contributions from Marius Pirvu. What is JITServer Technology? JITServer Technology is an Eclipse OpenJ9 JVM technology that decouples the JIT compiler from the JVM and lets the JIT compiler run remotely in its own process. This technique keeps the advantages of JIT compilations while eliminating their negative effects such as CPU and memory spikes,…

Balanced GC performance improvements: Eden + heap sizing improvements

Open J9’s Balanced GC policy is a region based, generational collector, which aims to provide a bound on worst case pause times, by eliminating the need for frequent global garbage collections. A more detailed description of how Balanced GC policy works, along with some of its advantages over the Gencon GC policy, can be found…

Innovations for Java running in containers

This blog is co-authored by Hang Shao, Marius Pirvu, Tobi Ajila and Vijay Sundaresan. 1.     Introduction Over a decade ago, the common form of deployment was large monolithic applications that handled all the business logic. In this model applications typically had long deployment windows and they were typically deployed on large on-prem server farms. Since…