23.06.0.0

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Release date: June 30, 2023

This release is based on Azul Prime 23.05.0.0 and corresponds to the following OpenJDK versions:

A new option, C2CompileThreshold, has been added. This option allows the C2 compile threshold to be specified for individual methods. This option was introduced because some methods that are rarely called are still important and need to undergo regular optimization. This is set using -XX:CompileCommand in the following way:

-XX:CompileCommand="option,<Class>::<method>,C2CompileThreshold=<threshold>"
The maximum supported code cache size has been increased to 1758 MB when AllocCodeCacheInLower2G is disabled using -XX:-AllocCodeCacheInLower2G.
It is no longer necessary to LD_PRELOAD the libnmt_hooks.so library in order to use extended Native Memory Tracking (NMT). The libnmt_hooks.so library is now linked by default.
Using Java Flight Recorder, you can now see exact JIT name for each stacktrace frame in Azul Mission Control in the Method Profiling tab. This uses the option JFRDistinguishJITTypes, which is set to true by default, and shows either C1, C2, or Falcon for each stacktrace frame. With JFRDistinguishJITTypes set to false, it shows JIT compiled.

Issue ID	Description
ZVM-27634	Unify Prime’s "java.vendor" with Zulu
ZVM-27514	High JFRCheckpoint pauses seen on Prime
ZVM-27506	Turn on JFRDistinguishJITTypes flag by default
ZVM-27424	Prime 11+ doesn’t throw IncompatibleClassChangeError in instanceKlass::method_at_itable
ZVM-27785	Fix segmentation fault on StubRoutines::stringIndexOf
ZVM-27675	Prohibit inlining for methods with invalid method ID
ZVM-27624	Disable RSS workaround only once use of large pages are confirmed
ZVM-27388	objSizes.jar application crashes with "assert(m->is_abstract()) failed: should be public and abstract" in fastdebug mode
ZVM-27549	Avoid native method calls from VM.java class

Issue ID

Description

ZVM-27634

Unify Prime’s "java.vendor" with Zulu

ZVM-27514

High JFRCheckpoint pauses seen on Prime

ZVM-27506

Turn on JFRDistinguishJITTypes flag by default

ZVM-27424

Prime 11+ doesn’t throw IncompatibleClassChangeError in instanceKlass::method_at_itable

ZVM-27785

Fix segmentation fault on StubRoutines::stringIndexOf

ZVM-27675

Prohibit inlining for methods with invalid method ID

ZVM-27624

Disable RSS workaround only once use of large pages are confirmed

ZVM-27388

objSizes.jar application crashes with "assert(m->is_abstract()) failed: should be public and abstract" in fastdebug mode

ZVM-27549

Avoid native method calls from VM.java class