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https://issues.apache.org/jira/browse/SOLR-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13049453#comment-13049453
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Adrien Grand commented on SOLR-2548:
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Hoss Man,
Regarding the best value of the number of threads to spawn based on the number
of CPUs and the traffic, one could imagine to decide whether to spawn a new
thread or to run the task in the current thread based on the load of the
server. This way, servers under high traffic would run every request in a
single thread (maximizing throughput) whereas servers under low traffic would
be able to use every processor in order to minimize response time. The load is
easily retrievable in Java 6 using OperatingSystemMXBean, I don't know if it is
possible in a non OS-specific way in Java 5.
I don't really understand what you mean by "if you really care about
parallelizing faceting, you probably wouldn't want some other intensive
component starving out the thread pool". Do you mean that you would expect some
requests to be run slower with every component using a global thread pool than
with a single thread pool dedicated to facets?
Yonik, why would you want to limit the number of threads on a per-request
basis, if enough CPUs are available?
> Multithreaded faceting
> ----------------------
>
> Key: SOLR-2548
> URL: https://issues.apache.org/jira/browse/SOLR-2548
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 3.1
> Reporter: Janne Majaranta
> Priority: Minor
> Labels: facet
> Attachments: SOLR-2548.patch, SOLR-2548_for_31x.patch
>
>
> Add multithreading support for faceting.
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