Strange behaviour on half-occupied heap

[Roman Kennke]

>> Looks like the original problem fixed, but new very possible related problem opens up with a fix.
>>
>> After a bit of time heap fills with fragmented data. 
>> Which results in the increasing rate of collections, pacing delays and finally full GC, 
>> while actually there are 350 MB of live data it fills whole 2G heap
> 
> This problem is unrelated: it is humongous fragmentation, see the log comments below. This can be
> mitigated by giving Shenandoah larger heap (so that fragmentation goes down, and some humongous
> objects stop being humongous too). Let's see if there are Shenandoah fixes that can help mitigate
> this too.

Or force larger regions so that humongous objects fit into regions and
are no longer humongous: e.g. -XX:ShenandoahHeapRegionSize=32M

Roman