RFR: 8298639: Perform I/O operations in bulk for RandomAccessFile [v3]

[Alan Bateman]

On Thu, 15 Dec 2022 09:56:37 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> This PR suggests improving performance for read and write operations for the longer primitives in `RandomAccessFile`.
>> 
>> These improvements would also propagate to other JDK classes relying on these improved `RandomAccessFile` operations.
>
> Per Minborg has updated the pull request incrementally with three additional commits since the last revision:
> 
>  - Improve benchmarks
>  - Add benchmark
>  - Use Bits instead of custom code

src/java.base/share/classes/java/io/RandomAccessFile.java line 1090:

> 1088:         buffer[0] = (byte)(v >>>  8);
> 1089:         write(buffer, 0, Short.BYTES);
> 1090:         //written += 2;

I suppose the commented out //written += ... can be removed, it seems to be leftover in at least 3 methods (not your doing of course).

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PR: https://git.openjdk.org/jdk/pull/11644