21.09.0.0

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21.09.0.0

Release date: September 29, 2021

This release corresponds to the following OpenJDK versions:

Major Version	OpenJDK Version
7	7u312
8	8u302
11	11.0.12+7
13	13.0.8+5
15	15.0.4+5

What’s New

General performance improvements.
GC log line has been expanded to include additional information for heap elasticity.
Introduces a new JFR event named "Deoptimization" which arises when previously compiled code gets discarded. The event is useful in troubleshooting performance issues including low throughput and high CPU utilization.

Resolved Issues

Issue ID Description

Issue ID	Description
ZVM-21015	High pause time during OldGC due to unloading of a long chain of subclasses.
ZVM-19788	Installation packages are now signed.
ZVM-20927	Abort the VM if GC safepoint operation time exceeds a configurable threshold. See the new GC options: `DieOnSafepointOperationTimeout` and `SafepointOperationTimeoutDelayMS`
ZVM-17584	Introduces a new JFR event named "Deoptimization" which arises when previously compiled code gets discarded. The event is useful in troubleshooting performance issues including low throughput and high CPU utilization.

ZVM-21015

High pause time during OldGC due to unloading of a long chain of subclasses.

ZVM-19788

Installation packages are now signed.

ZVM-20927

Abort the VM if GC safepoint operation time exceeds a configurable threshold. See the new GC options: DieOnSafepointOperationTimeout and SafepointOperationTimeoutDelayMS

ZVM-17584

Introduces a new JFR event named "Deoptimization" which arises when previously compiled code gets discarded. The event is useful in troubleshooting performance issues including low throughput and high CPU utilization.

Installation Changes

A new directory is created during installation: /etc/connected-compiler.

Known Issues

There are no new issues to report in this release.