thanks Jack, yes, i should evaluate lucene by query performance.
On Mon, Jul 8, 2013 at 12:45 AM, Jack Krupansky <j...@basetechnology.com>wrote: > To be clear, Lucene and Solr are "search" engines, NOT "storage" engines. > Has someone claimed otherwise to you? > > What is your query performance in in 4.x vs. 3.x? That's the true, proper > measure of Lucene and Solr performance. > > -- Jack Krupansky > > -----Original Message----- From: Chris Zhang > Sent: Sunday, July 07, 2013 12:26 PM > To: java-user@lucene.apache.org > Subject: Re: Please Help solve problem of bad read performance in lucene > 4.2.1 > > > thianks Adrien, > In my project, almost all hit docs are supposed to be fetched for every > query, what's why I am upset by the poor reading performance. Maybe I > should store field values which are expected to be stored in high > performance storage engine. > In the above test case, time consuming of reading all docs in lucene 3.0 is > about 78 sec, that reading speed is approximately 10MB/s , but 700+ sec in > lucene 4.2.1, which indicates reading speed is less than 1MB/s. So I think > committer of lucene should pay attention to this. > > > On Sun, Jul 7, 2013 at 10:23 PM, Adrien Grand <jpou...@gmail.com> wrote: > > Indeed, Lucene 4.1+ may be a bit slower for indices that comptelely >> fit in your file-system cache. On the other hand, you should see >> better performance with indices which are larger than the amount of >> physical memory of your machine. Your reading benchmark only measures >> IndexReader.get(int) which should only be used to display summary >> results (that is, only called 10 or 20 times per displayed page). Most >> of time, the bottleneck is rather searching which can be made more >> efficient on small indices by switching to an in-memory postings >> format. >> >> -- >> Adrien >> >> ------------------------------**------------------------------**--------- >> To unsubscribe, e-mail: >> java-user-unsubscribe@lucene.**apache.org<java-user-unsubscr...@lucene.apache.org> >> For additional commands, e-mail: >> java-user-help@lucene.apache.**org<java-user-h...@lucene.apache.org> >> >> >> > > ------------------------------**------------------------------**--------- > To unsubscribe, e-mail: > java-user-unsubscribe@lucene.**apache.org<java-user-unsubscr...@lucene.apache.org> > For additional commands, e-mail: > java-user-help@lucene.apache.**org<java-user-h...@lucene.apache.org> > >