[jdk17] RFR: 8269825: [TESTBUG] Missing testing for x86 KNL platforms

Fri Jul 2 22:43:47 UTC 2021

On Fri, 2 Jul 2021 19:35:56 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> Knights family of X86 Intel CPU (KNL) does not support some of avx512 features (AVX512VL/BW) and have other restrictions. We may not have such kind of machines in our testing environment and may miss bugs as JBS history shows (look recent fixes for KNL).
> On other hand we have some Windows VM instances which seem emulate KNL configuration and limit avx512 instructions on CPU which supports full set. Recent bug JDK-8269775 shows such example.
> I suggest to add -XX:+UseKNLSetting x86 diagnostic flag to emulate KNL settings in HotSpot VM to test such configuration.

Thank you, Dean.

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PR: https://git.openjdk.java.net/jdk17/pull/205