performance degradation in Array::newInstance on -XX:TieredStopAtLevel=1

[Martin Buchholz]

On Thu, Jan 3, 2019 at 11:26 PM Сергей Цыпанов <sergei.tsypanov at yandex.ru>
wrote:

>
> I've run into this performance effect while investigating creation of
> Spring's ConcurrentReferenceHashMap,
> it turned out that it used Array::newInstance to create array of
> References stored in a map's Segment:
>

Slight tangent - ConcurrentHashMap used to use Segments, but no longer
does.  Probably  ConcurrentReferenceHashMap is based on an old version of
ConcurrentHashMap and would benefit from a re-port.