RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v22]

[liach]

On Sun, 20 Feb 2022 20:30:29 GMT, XenoAmess <duke at openjdk.java.net> wrote:

>>> You should run benchmarks to see how bad the lookup performance degrades after you saves memory used by the hash table.
>> 
>> OK, would find some time for it.
>
>> > You should run benchmarks to see how bad the lookup performance degrades after you saves memory used by the hash table.
>> 
>> OK, would find some time for it.
> 
> @liach which jmh test should I run by the way?
> 
> Or is there some commandline tools for this?
> 
> I found nothing related to IdentityHashMap under `test/micro`

Unfortunately I don't think there is any for now. Maybe someone familiar with the identity hash map can comment on your changes to the expected map size

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PR: https://git.openjdk.java.net/jdk/pull/7431