Red Hat Bugzilla – Bug 1308539
Last modified: 2016-09-29 07:25:08 EDT
This is a tracking bug for Change: Shenandoah 1.0
For more details, see: https://fedoraproject.org//wiki/Changes/Shenandoah
This change aims at adding a very low pause time Garbage Collection(GC) algorithm named Shenandoah to OpenJDK.
On 2016-Feb-23, we have reached Fedora 24 Change Checkpoint: Completion deadline (testable).
At this point, all accepted changes should be substantially complete, and testable. Additionally, if a change is to be enabled by default, it must be so enabled at Change Completion deadline.
Change tracking bug should be set to the MODIFIED state to indicate it achieved completeness.
Incomplete and non testable Changes will be reported to FESCo on 2016-Feb-26 meeting. Contingency plan for System Wide Changes, if planned for Alpha (or in case of serious doubts regarding Change completion), will be activated.
Shenandoah is ready for testing.
How do I test this?
I grabbed F24 alpha and upgraded it.
[omajid@localhost ~]$ uname -a
Linux localhost.localdomain 4.5.1-300.fc24.x86_64 #1 SMP Tue Apr 12 18:55:06 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Then tried out the "-XX:+UseShenandoahGC" flag mentioned in the Change page:
[omajid@localhost ~]$ java -version
openjdk version "1.8.0_77"
OpenJDK Runtime Environment (build 1.8.0_77-b03)
OpenJDK 64-Bit Server VM (build 25.77-b03, mixed mode)
[omajid@localhost ~]$ java -XX:+UseShenandoahGC -version
Unrecognized VM option 'UseShenandoahGC'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
On 2016-Apr-19 we reached the "Change Checkpoint: 100% Code Complete Deadline" milestone for Fedora 24 release. At this point all the Changes not at least in in "ON_QA" state should be brought to FESCo for review. Please update the state of this bug to "ON_QA" if it is already 100% completed. Please let me know in case you have any trouble with the implementation and the Change needs any help or review.