RFR: 8254078: DataOutputStream is very slow post-disabling of Biased Locking

[Andrew Haley]

On Wed, 7 Oct 2020 14:24:24 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> It might be helpful to add a statement to the DataOutputStream class description to say that it not safe for by
> concurrent threads and it needs appropriate synchronization to coordinate multiple writers. This issue or another issue
> doesn't matter.

I see.

> Can the benchmark be turned into a microbenchmark for test/micro?

Now there's an interesting question. I can tweak the benchmark (which at present contains a modified version of
DataOutputSteam, so can compare and contrast) so that it measures only the performance of the core library's
implementation. Does that make sense? If so, I can add it to this PR.

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PR: https://git.openjdk.java.net/jdk/pull/542