On Sun, 20 Feb 2022 18:03:07 GMT, XenoAmess <[email protected]> wrote:
>> XenoAmess has updated the pull request incrementally with three additional
>> commits since the last revision:
>>
>> - refine test
>> - 1. optimize IdentityHashMap that when calling ::new(Map), do not call
>> map.size() twice but once.
>> 2. delete the this((int) ((1 + m.size()) * 1.1)); as it makes the table
>> over-allocate when size = 19.
>> - refine test
>
> src/java.base/share/classes/java/util/IdentityHashMap.java line 270:
>
>> 268: */
>> 269: public IdentityHashMap(Map<? extends K, ? extends V> m) {
>> 270: this(m, m.size());
>
> I actually do not know if this change shall be in this pr, or in a new issue.
> But the original codes can cause IdentityHashMap to over-allocate at size ==
> 19.
> @stuart-marks what do you think about this?
I checked this `(int) ((1 + m.size()) * 1.1)`. It is there when the codes
original created there at 2007.
I don't thik it reasonable. or is there eveidence it be?
-------------
PR: https://git.openjdk.java.net/jdk/pull/7431
