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Sean Bridges edited comment on LUCENE-3932 at 4/2/12 4:16 PM: -------------------------------------------------------------- {quote}I'm curious how much larger it'd be if we stopped delta coding... for your case, how large is the byte[] in RAM (just call dataPagedBytes.getPointer(), just before we freeze it, and print that result) vs the tii on disk...?{quote} dataPagedBytes.getPointer() == 124973970 On disk the .tii file is 69508193 bytes The entire index is ~50 gigs. was (Author: sgbridges): {quote}I'm curious how much larger it'd be if we stopped delta coding... for your case, how large is the byte[] in RAM (just call dataPagedBytes.getPointer(), just before we freeze it, and print that result) vs the tii on disk...?{quote} dataPagedBytes.getPointer() == 124973970 On disk the .tii file is 69508193 bytes > Improve load time of .tii files > ------------------------------- > > Key: LUCENE-3932 > URL: https://issues.apache.org/jira/browse/LUCENE-3932 > Project: Lucene - Java > Issue Type: Improvement > Affects Versions: 3.5 > Environment: Linux > Reporter: Sean Bridges > Attachments: LUCENE-3932.trunk.patch, perf.csv > > > We have a large 50 gig index which is optimized as one segment, with a 66 MEG > .tii file. This index has no norms, and no field cache. > It takes about 5 seconds to load this index, profiling reveals that 60% of > the time is spent in GrowableWriter.set(index, value), and most of time in > set(...) is spent resizing PackedInts.Mutatable current. > In the constructor for TermInfosReaderIndex, you initialize the writer with > the line, > {quote}GrowableWriter indexToTerms = new GrowableWriter(4, indexSize, > false);{quote} > For our index using four as the bit estimate results in 27 resizes. > The last value in indexToTerms is going to be ~ tiiFileLength, and if instead > you use, > {quote}int bitEstimate = (int) Math.ceil(Math.log10(tiiFileLength) / > Math.log10(2)); > GrowableWriter indexToTerms = new GrowableWriter(bitEstimate, indexSize, > false);{quote} > Load time improves to ~ 2 seconds. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org