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https://issues.apache.org/jira/browse/LUCENE-6242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318179#comment-14318179
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Uwe Schindler commented on LUCENE-6242:
---------------------------------------
Oha :-) I assume for large ones or also with stuff like 16?
At least we should fix this issue here. If we enable random alignments could be
decided after some local tests. In any case I would enable this only very
seldom with values 8 <= x <= 128.
> SparseFixedBitDocIdSet.ramBytesUsed() reports wrong size if alignment of JVM
> is not 8
> -------------------------------------------------------------------------------------
>
> Key: LUCENE-6242
> URL: https://issues.apache.org/jira/browse/LUCENE-6242
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Uwe Schindler
>
> There seems to be a bug in SparseFixedBitDocIdSet's ramBytesUsed. To me this
> is a bit crazy implemented, so I have not yet found the issue. To me it looks
> like some of the summing up breaks if the alignment of the JVM is not 8:
> {noformat}
> [junit4] Suite: org.apache.lucene.util.TestSparseFixedBitDocIdSet
> [junit4] 2> NOTE: reproduce with: ant test
> -Dtestcase=TestSparseFixedBitDocIdSet -Dtests.method=testRamBytesUsed
> -Dtests.seed=
> C1F3B881CB1C5E8A -Dtests.locale=es_BO -Dtests.timezone=America/Detroit
> -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> [junit4] FAILURE 0.06s J1 | TestSparseFixedBitDocIdSet.testRamBytesUsed <<<
> [junit4] > Throwable #1: java.lang.AssertionError: expected:<264> but
> was:<256>
> [junit4] > at
> __randomizedtesting.SeedInfo.seed([C1F3B881CB1C5E8A:3350AAC1016341DC]:0)
> [junit4] > at
> org.apache.lucene.util.BaseDocIdSetTestCase.testRamBytesUsed(BaseDocIdSetTestCase.java:104)
> [junit4] > at java.lang.Thread.run(Thread.java:745)
> {noformat}
> To reproduce this failure, run inside core (with 64 bits JVM):
> {noformat}
> ant test -Dtestcase=TestSparseFixedBitDocIdSet
> -Dtests.method=testRamBytesUsed -Dargs="-XX:ObjectAlignmentInBytes=16"
> -Dtests.seed=C1F3B881CB1C5E8A
> {noformat}
> The default works:
> {noformat}
> ant test -Dtestcase=TestSparseFixedBitDocIdSet
> -Dtests.method=testRamBytesUsed -Dargs="-XX:ObjectAlignmentInBytes=8"
> -Dtests.seed=C1F3B881CB1C5E8A
> {noformat}
> I think we should randomly also specify the ObjectAlignmentInBytes for test
> runs on Policeman Jenkins. Any Power of 2 is fine.
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