No Full GC on JDK 17

[Sushant Kaushik]

  Hi All,
I'm facing a peculiar issue where i do see a full GC intermittently but
i've not been able to figure out a deterministic way to trigger a full GC.
I need full GC so that memory is allocated back to OS, this is for k8s HPA
scale down to work.
Here is the JVM config that i'm using:

>               -Xmx9830M
>
>     -Xms3200M
>       -Xlog:gc*:file=/tmp/gc.log:time,uptime
>       -server
>       -XX:MetaspaceSize=96m
>       -XX:+UseG1GC
>       -XX:MaxGCPauseMillis=200
>       -XX:+PrintFlagsFinal
>       -XX:InitiatingHeapOccupancyPercent=100
>       -XX:+ExplicitGCInvokesConcurrent
>       -XX:G1HeapRegionSize=16
>       -XX:MinMetaspaceFreeRatio=50
>       -XX:MaxMetaspaceFreeRatio=80
>       -XX:G1PeriodicGCInterval=5000
>       -XX:G1PeriodicGCSystemLoadThreshold=10.0
>       -XX:-G1PeriodicGCInvokesConcurrent
>       -XX:+UnlockDiagnosticVMOptions
>       -XX:-G1UsePreventiveGC
>
> I've set InitiatingHeapOccupancyPercent to 100, because i don't want any
concurrent GC( i read because of concurrent GC, full GC won't be triggered).

Please help me out. TIA.
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