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https://issues.apache.org/jira/browse/LUCENE-6069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14316387#comment-14316387
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Uwe Schindler commented on LUCENE-6069:
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+1 To Robert's patch here, with the reflection I provided as separate patch!
The reflection will be needed for the nuke of Unsafe anyways, because we need
HotspotMXBean to detect reference size (which is still important, I just
reviewed the code using all parts using the constant from RAMUsageEstimator).
If one runs on compact profile on 64 bit without HotspotBean it will just
assume that a refenece pointer is 8 bytes. If its uses compressed Oops we just
calculate the size of arrays wrong (by factor of 2).
In my opinion: We should have good constants for huge systems, because with
heap sizes around several gigabytes, the memory reporting by
Lucene/Solr/Elasticsearch should not be wrong by factor 2 for some structures.
I don't care about static object headers or alignments, if they are wrong - it
has less effect (because we generally have few huge objects in
FST/Filter/DocValues).
If you use compact profile on some platform, the ram usage reporting is in most
cases not so interesting, because you are already limited by the platform...
> compile with compact profiles
> -----------------------------
>
> Key: LUCENE-6069
> URL: https://issues.apache.org/jira/browse/LUCENE-6069
> Project: Lucene - Core
> Issue Type: Task
> Components: general/build
> Affects Versions: Trunk
> Reporter: Robert Muir
> Assignee: Robert Muir
> Fix For: Trunk
>
> Attachments: LUCENE-6069.patch, LUCENE-6069.patch, LUCENE-6069.patch
>
>
> If we clean up the 'alignment' calculator in RamUsageEstimator, we can
> compile core with compact1, and the rest of lucene (except tests) with
> compact2.
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