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https://issues.apache.org/jira/browse/LUCENE-9662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17408746#comment-17408746
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Michael McCandless commented on LUCENE-9662:
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Whoa, look [how much faster {{CheckIndex}}
got|https://home.apache.org/~mikemccand/lucenebench/checkIndexTime.html] in the
nightly benchmarks! From ~235 seconds to ~110.
Of course, this is on [ridiculously concurrent (256 cores with hyperthreading)
hardware|https://blog.mikemccandless.com/2021/01/apache-lucene-performance-on-128-core.html],
but still it is only using the default 4 concurrent threads right? I'll add
an annotation, and increase its concurrency some!
> CheckIndex should be concurrent
> -------------------------------
>
> Key: LUCENE-9662
> URL: https://issues.apache.org/jira/browse/LUCENE-9662
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Priority: Major
> Time Spent: 18h
> Remaining Estimate: 0h
>
> I am watching a nightly benchmark run slowly run its {{CheckIndex}} step,
> using a single core out of the 128 cores the box has.
> It seems like this is an embarrassingly parallel problem, if the index has
> multiple segments, and would finish much more quickly on concurrent hardware
> if we did "thread per segment".
> If wanted to get even further concurrency, each part of the Lucene index that
> is checked is also independent, so it could be "thread per segment per part".
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