RFR: 8317538: RSA have scalability issue for high vCPU numbers

[Anthony Scarpino]

On Fri, 27 Oct 2023 14:43:56 GMT, Ben Perez <duke at openjdk.org> wrote:

> Modified `getService` method to prevent caching of `ServiceKey`, which was negatively impacting multithreaded performance

I have a few questions:
- The change listed in the bug is not the same as this PR.  The bug removes the section and leaves only the new ServiceKey().  The condition statement left will always be false.
- This seems like a large performance difference for just removing a condition for the existing key.  Is the problem that is volatile?  Might removing volatile help?
- This change is done for vCPU machines.  What is the impact on non vCPU?  The reason for the caches was most likely to help single threaded performance.  How have those been situations been effected?

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PR Comment: https://git.openjdk.org/jdk/pull/16403#issuecomment-1783239321