[
https://issues.apache.org/jira/browse/LUCENE-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12799869#action_12799869
]
Aaron McCurry commented on LUCENE-2205:
---------------------------------------
Sure I can rework things for that. Not sure if read through my blog, but it
seems as if the packing of the bytes as vints and such are actually faster
than doing the java reference lookups. At least for the test cases that I
have come up with. Plus the JVM's GC is much happier without having to
traverse the object graph of terms.
Over the next few days I will rework the api to StandardTermsIndexReader and
repost a patch. Thanks.
On Wed, Jan 13, 2010 at 1:36 PM, Michael McCandless (JIRA)
> Rework of the TermInfosReader class to remove the Terms[], TermInfos[], and
> the index pointer long[] and create a more memory efficient data structure.
> -------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2205
> URL: https://issues.apache.org/jira/browse/LUCENE-2205
> Project: Lucene - Java
> Issue Type: Improvement
> Environment: Java5
> Reporter: Aaron McCurry
> Attachments: patch-final.txt, RandomAccessTest.java, rawoutput.txt
>
>
> Basically packing those three arrays into a byte array with an int array as
> an index offset.
> The performance benefits are stagering on my test index (of size 6.2 GB, with
> ~1,000,000 documents and ~175,000,000 terms), the memory needed to load the
> terminfos into memory were reduced to 17% of there original size. From 291.5
> MB to 49.7 MB. The random access speed has been made better by 1-2%, load
> time of the segments are ~40% faster as well, and full GC's on my JVM were
> made 7 times faster.
> I have already performed the work and am offering this code as a patch.
> Currently all test in the trunk pass with this new code enabled. I did write
> a system property switch to allow for the original implementation to be used
> as well.
> -Dorg.apache.lucene.index.TermInfosReader=default or small
> I have also written a blog about this patch here is the link.
> http://www.nearinfinity.com/blogs/aaron_mccurry/my_first_lucene_patch.html
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org
For additional commands, e-mail: java-dev-h...@lucene.apache.org
