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https://issues.apache.org/jira/browse/LUCENE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983154#action_12983154
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Michael McCandless commented on LUCENE-2324:
--------------------------------------------
I ran a quick perf test here: I built the 10M Wikipedia index,
Standard codec, using 6 threads. Trunk took 541.6 sec; RT took 518.2
sec (only a bit faster), but the test wasn't really fair because it
flushed @ docCount=12870.
But I can't test flush by RAM -- that's not working yet on RT right?
(The search results matched, which is nice!)
Then I ran a single-threaded test. Trunk took 1097.1 sec and RT took
1040.5 sec -- a bit faster! Presumably in the noise (we don't expect
a speedup?), but excellent that it's not slower...
I think we lost infoStream output on the details of flushing? I can't
see when which DWPTs are flushing...
> Per thread DocumentsWriters that write their own private segments
> -----------------------------------------------------------------
>
> Key: LUCENE-2324
> URL: https://issues.apache.org/jira/browse/LUCENE-2324
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Fix For: Realtime Branch
>
> Attachments: LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch,
> LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch, LUCENE-2324-SMALL.patch,
> LUCENE-2324.patch, LUCENE-2324.patch, LUCENE-2324.patch, lucene-2324.patch,
> lucene-2324.patch, LUCENE-2324.patch, test.out, test.out, test.out, test.out
>
>
> See LUCENE-2293 for motivation and more details.
> I'm copying here Mike's summary he posted on 2293:
> Change the approach for how we buffer in RAM to a more isolated
> approach, whereby IW has N fully independent RAM segments
> in-process and when a doc needs to be indexed it's added to one of
> them. Each segment would also write its own doc stores and
> "normal" segment merging (not the inefficient merge we now do on
> flush) would merge them. This should be a good simplification in
> the chain (eg maybe we can remove the *PerThread classes). The
> segments can flush independently, letting us make much better
> concurrent use of IO & CPU.
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