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https://issues.apache.org/jira/browse/LUCENE-2571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13020230#comment-13020230
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Simon Willnauer commented on LUCENE-2571:
-----------------------------------------
bq. Well.. merges tie up IO (especially if not on fancy SSDs/RAIDs), which in
turn lags flushes -> bigger delays for stop the world flushes / lower bandwith
cap (after which they are forced to stop the world) for parallel flushes.
True it will make a difference in certain situations but not for this benchmark
RT does way more merges here since we are flushing way more segments. the time
windows I used here is where we almost don't merge at all in the trunk run so
it should not make a difference.
I ran those benchmarks again with BalancedSegmentMergePolicy and it doesn't
make any difference really. see below
!wikimedium.trunk.Standard.nd10M_dps_BalancedSegmentMergePolicy.png!
> Indexing performance tests with realtime branch
> -----------------------------------------------
>
> Key: LUCENE-2571
> URL: https://issues.apache.org/jira/browse/LUCENE-2571
> Project: Lucene - Java
> Issue Type: Task
> Components: Index
> Reporter: Michael Busch
> Priority: Minor
> Fix For: Realtime Branch
>
> Attachments: wikimedium.realtime.Standard.nd10M_dps.png,
> wikimedium.realtime.Standard.nd10M_dps_addDocuments.png,
> wikimedium.realtime.Standard.nd10M_dps_addDocuments_flush.png,
> wikimedium.trunk.Standard.nd10M_dps.png,
> wikimedium.trunk.Standard.nd10M_dps_BalancedSegmentMergePolicy.png,
> wikimedium.trunk.Standard.nd10M_dps_addDocuments.png
>
>
> We should run indexing performance tests with the DWPT changes and compare to
> trunk.
> We need to test both single-threaded and multi-threaded performance.
> NOTE: flush by RAM isn't implemented just yet, so either we wait with the
> tests or flush by doc count.
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