RFR: 8303210: [linux, Windows] Enable UseSystemMemoryBarrier by default if possible [v3]

Wed Mar 1 05:20:08 UTC 2023

On Tue, 28 Feb 2023 06:28:42 GMT, David Holmes <dholmes at openjdk.org> wrote:

> There is also a 7.9% regression on Aarch64 with the Renaissance-Scala-Kmeans benchmark.
> 
> And 6% on Renaissance-ParMnemonics on Aarch64 (but a 7% improvement on x64 for this one).
> 
> This may have to be an opt-in potential optimisation, for which we would need a full-fledged product flag (not experimental or diagnostic).

Thanks a lot for measuring! It's very unfortunate that this nice OS feature performs poorly in some cases! So, I'll keep it off by default for now (hoping that there will be some improvement in the future).

-------------

PR: https://git.openjdk.org/jdk/pull/12753