Use -XX:+IProfileDuringStartupPhase in populate_scc.sh scripts

[rmnattas]

Add -XX:+IProfileDuringStartupPhase option to the populate scc script

When populating the SCC during the build of both the Liberty and app containers, the JVM can disable the IProfiler collection during JVM startup to enhance startup time, but this limits the amount of IProfiler information that can be stored into the SCC.

OpenJ9 can now support -XX:+IProfileDuringStartupPhase to enforce collecting IProfiler information during startup and better populate the SCC, which can be used in the populate_scc.sh script.

The option will be ignored if the used OpenJ9 build does not have the new option implemented.

Effect is larger amount of JIT Data in the SCC after a populate_scc run.
There’s no functional implications on Liberty, and performance effect is application dependent.

In AcmeAir micro-services we see a jump in the amount of JIT Data stored in the SCC when using this option in the populate_scc.sh script, from 140KB to 524KB (and from 132KB to 388KB for the Liberty container layer). Performance effect shows around 1.5% better throughput with default setup, and no noticeable rampup change. I don’t have results on startup effect, but warm/production-runs won’t use the option.

Other than OpenJ9 testing, we have used the option in the populate_scc.sh script during the CI process of building the containers.

OpenJ9 PR: eclipse-openj9/openj9#18381

Corresponding OpenLiberty PR: OpenLiberty/ci.docker#482

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[rmnattas]

@leochr

[leochr]

@rmnattas Thanks for the PR. The change itself looks fine. Few comments:

• please target the vNext branch as that's used for dev
• since there could be some impact to applications, it'll be good to deliver the change to upcoming releases of Liberty only and not update existing releases
• does Open Liberty also require similar PR? https://github.com/OpenLiberty/ci.docker

[rmnattas]

Thanks @leochr, updated the PR as requested (changing version 23.0.0.12 and latest only in vNext).
The OpenLiberty version is at OpenLiberty/ci.docker#482.

[rmnattas]

@leochr Updated the PR to modify 24.0.0.1 and latest instead. Similarly for OpenLiberty/ci.docker#482