RFR: 7903912: JMH: Pad using a mix of bytes and longs

[Aleksey Shipilev]

On Sun, 15 Dec 2024 18:51:54 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> Using a mix of bytes and longs we should get the gap-filling effect described in https://shipilev.net/jvm/objects-inside-out/#_observation_hierarchy_tower_padding_trick_collapse_in_jdk_15 while reducing size of generated code by roughly 20%:
> 
> 
> 864772  jmh-samples/target/jmh-samples-1.38-SNAPSHOT.jar
> 490531  jmh-samples/target/jmh-samples-1.38-SNAPSHOT-sources.jar
> 
> 684383 jmh-samples/target/jmh-samples-1.38-SNAPSHOT.jar
> 399758 jmh-samples/target/jmh-samples-1.38-SNAPSHOT-sources.jar

So, good news. I was able to stabilize current JMH tests. If you pull from master, it would probably turn green.

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PR Comment: https://git.openjdk.org/jmh/pull/147#issuecomment-2549288015