Uwe Schindler created LUCENE-6242:
-------------------------------------
Summary: 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:
{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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