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https://issues.apache.org/jira/browse/SOLR-13350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867066#comment-17867066
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Christine Poerschke commented on SOLR-13350:
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bq. ... currently nothing controls the passing of the executor to Lucene's
{{IndexSearcher}} constructor. ...
Something like https://github.com/apache/solr/pull/2570 would be a way to
control it, on a node level.
bq. ... Why this change in bin/solr to get the max CPUs instead of calling
ManagementFactory.getOperatingSystemMXBean().getAvailableProcessors() ? ...
https://github.com/apache/solr/pull/2569 takes up [~gus]'s suggestion to use
{{Runtime.getRuntime().availableProcessors()}} mixed together with
[~ichattopadhyaya]'s change to remove {{nproc}} use, plus matching config and
doc update.
bq. ... Lucene has {{MAX_DOCS_PER_SLICE}} and {{MAX_SEGMENTS_PER_SLICE}}
constants and slicing logic ...
Experiments with that did not provide support for making this configurable.
bq. ... I'm benchmarking more thoroughly at the moment. ...
Looking forward to learning more about the results, as and when they are
available. Thanks for re-benchmarking on this!
> Explore collector managers for multi-threaded search
> ----------------------------------------------------
>
> Key: SOLR-13350
> URL: https://issues.apache.org/jira/browse/SOLR-13350
> Project: Solr
> Issue Type: New Feature
> Reporter: Ishan Chattopadhyaya
> Assignee: Ishan Chattopadhyaya
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 9.7
>
> Attachments: SOLR-13350-pre-PR-2508.patch, SOLR-13350.patch,
> SOLR-13350.patch, SOLR-13350.patch
>
> Time Spent: 13h
> Remaining Estimate: 0h
>
> AFAICT, SolrIndexSearcher can be used only to search all the segments of an
> index in series. However, using CollectorManagers, segments can be searched
> concurrently and result in reduced latency. Opening this issue to explore the
> effectiveness of using CollectorManagers in SolrIndexSearcher from latency
> and throughput perspective.
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