CFV: New Project: ZGC

Andrew Haley aph at
Thu Oct 26 17:20:38 UTC 2017

On 26/10/17 16:42, Volker Simonis wrote:
> 1. What are the benefits / advantages of ZGC over Shenandoah?
> 2. Does it make sense to have both, ZGC and Shenandoah in the main code line?
> 2.1 If yes, why?
> 2.2 If no, why you propose ZGC at all and not contribute to
> Shenandoah? It's there since more than two years! That you already
> worked on ZGC for some time as well doesn't count here because we (the
> OpenJDK community) couldn't see that and had no chance to contribute
> to it.
> 3. Oracle has just deprecated CMS and other collectors because
> according to Oracle it was just too expensive to maintain that many
> collectors in parallel. Now I wonder how yet another new collector
> fits into the picture?
> The answer to all these question would be important for me before
> casting a qualified vote.

Yep.  It would be unfortunate if it appeared that all this was being
done without the preparation required of external contributors.

Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <>
EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671

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