6/12/2023 0 Comments Redhat openjdk![]() The relative limit can still be adjusted by users from our default of 50% by setting JAVA_MAX_MEM_RATIO (to e.g. This also means the containers will be ready for Cgroups v2. We are moving away from the container-run scripts reading the Cgroups filesystem(s) and calculating the absolute heap limit. OpenJDK 11 and 17 have support for Cgroups V2, with OpenJDK 8 support due in the forthcoming April update (8u372). Additionally, the kernel's Cgroups feature (retrospectively renamed 'Cgroups v1') was rewritten from scratch as Cgroups v2. Using it in preference to -Xmx has become best practice because the effective limit can track changes to the container memory limit. ![]() The JVM parameter -XX:MaxRAMPercentage was added. In the times since this feature was developed, OpenJDK has grown its own container awareness and can read and respond to Cgroup memory limits. Until now, our container run scripts were responsible for querying the kernel Cgroup settings, calculating what the ceiling should be as an absolute value, and setting the OpenJDK -Xmx flag accordingly. The containers set a ceiling value on the amount of heap space that Java can allocate, defaulting to 50% and adjustable by setting JAVA_MAX_MEM_RATIO (e.g. We are making a change to the default JVM memory tuning parameters, moving away from setting the JVM -Xmx parameter and instead using -XX:MaxRAMPercentage ( OPENJDK-1486). The next release of the UBI8 OpenJDK containers, version 1.15, is more exciting. Removed an old, long-deprecated JBoss Maven repository ( OPENJDK-921).Adjusted the way we build, which should result in smaller images ( OPENJDK-1336).The next release of the UBI9 OpenJDK containers, version 1.14, is a relatively minor update with just two user-visible changes: What to expect in the next container update The next container feature update will be released by March 10, 2023. Our aim is to make approximately quarterly container updates spaced out between the CPU releases. In order to extend and enhance the containers, we need to release updates at other times. For CPU updates, we generally limit the container changes solely to the updated OpenJDK. We release updated UBI for OpenJDK containers with the updated OpenJDK versions very soon after the upstream releases. These typically land in January, April, July, and October. The OpenJDK project provides new updates on a quarterly cycle and it is called the Cumulative Patch Update (or CPU for short). This article explains the changes in this update and the updates to come. We are about to ship the next update to the Universal Base Image (UBI) of the Red Hat build of OpenJDK containers.
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