liuxian created SPARK-21860:
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Summary: Optimize heap memory allocator
Key: SPARK-21860
URL: https://issues.apache.org/jira/browse/SPARK-21860
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.3.0
Reporter: liuxian
Priority: Minor
In `HeapMemoryAllocator`, when allocating memory from pool, and the key of
pool is memory size.
Actually some size of memory ,such as 1025bytes,1026bytes,......1032bytes, we
can think they are the sameļ¼because we allocate memory in multiples of 8 bytes.
In this case, we can improve memory reuse.
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