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https://issues.apache.org/jira/browse/SOLR-2356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645001#comment-13645001
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Alexey Serba commented on SOLR-2356:
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It seems like bottleneck in colby's case is database connection and indexing
records from a single database result set using multiple threads won't help
that much (unless you have really CPU intensive analysis process).
bq. In my opinion, DIH should be completely redesigned as a standalone webapp.
It is a major design flaw that it is a RequestHandler within a Solr
Core/collection.
+1
> indexing using DataImportHandler does not use entire CPU capacities
> -------------------------------------------------------------------
>
> Key: SOLR-2356
> URL: https://issues.apache.org/jira/browse/SOLR-2356
> Project: Solr
> Issue Type: Improvement
> Components: update
> Affects Versions: 4.0-ALPHA
> Environment: intel xeon processor (4 cores), Debian Linux Lenny,
> OpenJDK 64bits server v1.6.0
> Reporter: colby
> Priority: Minor
> Labels: test
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> When I use a DataImportHandler to index a large number of documents (~35M),
> cpu usage doesn't go over than 100% cpu (i.e. just one core).
> When I configure 4 threads for the <entity> tag, the cpu usage is splitted to
> 25% per core but never use 400% of cpu (i.e 100% of the 4 cores)
> I use solr embedded with jetty server.
> Is there a way to tune this feature in order to use all cores and improve
> indexing performances ?
> Because for the moment, an extra script (PHP) gives better indexing
> performances than DIH.
> thanks
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