Future of CMS

Jon Masamitsu jon.masamitsu at oracle.com
Sat Jun 11 01:35:54 UTC 2016

Added hotspot-gc-dev.

On 6/10/2016 6:17 PM, Jon Masamitsu wrote:
> Jungwoo, Ramki, Tony (and other friends of CMS),
> I wanted to be sure you guys saw this JEP.
> Deprecate the CMS garbage collector (UseConcMarkSweepGC).
> http://openjdk.java.net/jeps/8142518
> I know you do development on CMS and wanted to know if
> had thoughts about the future of CMS.
> At some point Oracle is going to stop supporting CMS.
> The burden of testing and maintaining the CMS code doesn't
> make much sense given that we think G1 is the better
> collector.    If we deprecate CMS in jdk9, support would be dropped
> no earlier than jdk10.
> Have you guys talked about what you would like to do with regard
> to continuing CMS development without Oracle's help?
> I've been told that if CMS exists in the Oracle binaries, then
> customers will expect it to work.  So not supporting CMS
> means it is not in the build.
> Jon

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