RFR: 8287453: RenderPerfTest incorrectly measures performance

[Ajit Ghaisas]

On Tue, 31 May 2022 15:28:34 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> > Is it only a test stabilization fix? or were you able to uncover any performance issue (either with OpenGL or with Metal pipeline) with this change? Can you please provide before/after numbers?
> 
> Initially it was a stabilization fix. However, I've found couple of issues: missing frames (I have minimal test case and here is the issue [JDK-8287600](https://bugs.openjdk.java.net/browse/JDK-8287600) ) and low performance in some test cases comparing with OGL. I've attached the results to this issue.

Thanks for providing the performance numbers in JBS and filing the issue for missing frame.

Another bug needs to be filed for tests having lower performance with the Metal pipeline as compared to OpenGL pipeline.
It's a surprise that the modified RenderPerf test shows considerable performance difference (whereas J2DBench tests show difference only in some cases)

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PR: https://git.openjdk.java.net/jdk/pull/8928