Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19077
@cloud-fan IIUC, this PR does not change alignment policy for page
allocation. Alignment policy still depends on JVM. This PR changes reuse policy
in memory pool.
If you are asking about round policy (i.e. 8-byte in this PR) for memory
reuse, I do not have strong opinion. 8-byte is also fine.
If you are asking about allocation policy, it would be good to use 8-byte
boundaries for an allocation as HotSpot and IBM JVMs do.
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