Wan Kun created SPARK-53966:
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Summary: Reduce default page size by LONG_ARRAY_OFFSET if ZGC and
ON_HEAP are used
Key: SPARK-53966
URL: https://issues.apache.org/jira/browse/SPARK-53966
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 4.1.0
Reporter: Wan Kun
Both G1GC and ZGC needs extra object header (usually 16 bytes in 64bit system)
when allocating region or ZPage for java long array, so the really bytes
allocated is pageSize+16.
So we need consider the object header when allocating spark pages.
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