Question regarding JEP 8204089 Timely Reducing Unused Committed Memory (original) (raw)

Zhengyu Gu zgu at redhat.com
Fri Jun 1 12:10:43 UTC 2018

Hi,

5)I have not heard of J9 Gencon/Shenandoah providing similar functionality. Can you point me to further documentation on which feature you model upon?

Shenandoah does provide similar functionality under experimental flags:

-XX:+ShenandoahUncommit -XX:ShenandoahUncommitDelay

It does not need full gc before uncommitting (actually it calls madvise(MADV_DONTNEED) on Linux)

Also, it has "compact" heuristics that targets low memory footprint by aggressively uncommitting heap.

Thanks,

-Zhengyu

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