RFR: 7979: Reduce allocation rate in ParserStats

[Erik Gahlin]

On Wed, 23 Nov 2022 19:12:48 GMT, Jean-Philippe Bempel <jpbempel at openjdk.org> wrote:

> As we are in 9 branch, could we consider including a lib like fastutil for dealing better with primitives collections?

Long time ago, when most people had 32-bit OS, I experimented with storing JMC values in primitive arrays, mostly to reduce memory. Problem was when values needed to be visualized in a table. You either had to implement sorting, filtering, formatting etc. for every type or convert it to Object/Comparable. If you converted it to an object, the GUI became sluggish when processing values in the table. Today there are better garbage collectors etc. but it may be interesting to know.

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PR: https://git.openjdk.org/jmc/pull/455