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https://issues.apache.org/jira/browse/LUCENE-5373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-5373:
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Attachment: LUCENE-5373.patch
New version of the patch with Lucene40DocValuesProducer as well. Unless I
missed something, {{RamUsageEstimator.sizeOf(Object)}} is not called by
{{SegmentReader.ramBytesUsed()}} anymore.
You may still see calls to {{RamUsageEstimator.sizeOf(native array)}} but these
methods are actually both accurate and fast: they basically just compute
{{NUM_BYTES_ARRAY_HEADER + length * NUM_BYTES_element}} and return an aligned
size.
> Lucene42DocValuesProducer.ramBytesUsed is over-estimated
> --------------------------------------------------------
>
> Key: LUCENE-5373
> URL: https://issues.apache.org/jira/browse/LUCENE-5373
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5373.patch, LUCENE-5373.patch, LUCENE-5373.patch,
> LUCENE-5373.patch
>
>
> Lucene42DocValuesProducer.ramBytesUsed uses
> {{RamUsageEstimator.sizeOf(this)}} to return an estimation of the memory
> usage. One of the issues (there might be other ones) is that this class has a
> reference to an IndexInput that might link to other data-structures that we
> wouldn't want to take into account. For example, index inputs of a
> {{RAMDirectory}} all point to the directory itself, so
> {{Lucene42DocValuesProducer.ramBytesUsed}} would return the amount of memory
> used by the whole directory.
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