| 1 | CLucene README
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| 2 | ==============
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| 3 |
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| 4 | ------------------------------------------------------
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| 5 | CLucene is a C++ port of Lucene.
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| 6 | It is a high-performance, full-featured text search
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| 7 | engine written in C++. CLucene is faster than lucene
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| 8 | as it is written in C++.
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| 9 | ------------------------------------------------------
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| 10 |
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| 11 | CLucene has contributions from many, see AUTHORS
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| 12 |
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| 13 | CLucene is distributed under the GNU Lesser General Public License (LGPL)
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| 14 | *or*
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| 15 | the Apache License, Version 2.0
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| 16 | See the LGPL.license and APACHE.license for the respective license information.
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| 17 | Read COPYING for more about the license.
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| 18 |
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| 19 | Installation
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| 20 | ------------
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| 21 | * For Linux, MacOSX, cygwin and MinGW build information, read INSTALL.
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| 22 | * Boost.Jam files are provided in the root directory and subdirectories.
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| 23 | * Microsoft Visual Studio (6&7) are provided in the win32 folder.
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| 24 |
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| 25 | Mailing List
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| 26 | ------------
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| 27 | Questions and discussion should be directed to the CLucene mailing list
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| 28 | at [email protected]
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| 29 | Find subscription instructions at
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| 30 | http://lists.sourceforge.net/lists/listinfo/clucene-developers
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| 31 | Suggestions and bug reports can be made on our bug tracking database
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| 32 | (http://sourceforge.net/tracker/?group_id=80013&atid=558446)
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| 33 |
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| 34 | The latest version
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| 35 | ------------------
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| 36 | Details of the latest version can be found on the CLucene sourceforge project
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| 37 | web site: http://www.sourceforge.net/projects/clucene
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| 38 |
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| 39 | Documentation
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| 40 | -------------
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| 41 | Documentation is provided at http://clucene.sourceforge.net/doc/doxygen/html/
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| 42 | You can also build your own documentation by running doxygen from the root directory
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| 43 | of clucene.
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| 44 | CLucene is a very close port of Java Lucene, so you can also try looking at the
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| 45 | Java Docs on http://lucene.apache.org/java/
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| 46 |
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| 47 |
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| 48 | Performance
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| 49 | -----------
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| 50 | Very little benchmarking has been done on clucene. Andi Vajda posted some
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| 51 | limited statistics on the clucene list a while ago with the following results.
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| 52 |
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| 53 | There are 250 HTML files under $JAVA_HOME/docs/api/java/util for about
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| 54 | 6108kb of HTML text.
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| 55 | org.apache.lucene.demo.IndexFiles with java and gcj:
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| 56 | on mac os x 10.3.1 (panther) powerbook g4 1ghz 1gb:
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| 57 | . running with java 1.4.1_01-99 : 20379 ms
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| 58 | . running with gcj 3.3.2 -O2 : 17842 ms
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| 59 | . running clucene 0.8.9's demo : 9930 ms
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| 60 |
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| 61 | I recently did some more tests and came up with these rough tests:
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| 62 | 663mb (797 files) of Guttenberg texts
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| 63 | on a Pentium 4 running Windows XP with 1 GB of RAM. Indexing max 100,000 fields
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| 64 | Jlucene: 646453ms. peak mem usage ~72mb, avg ~14mb ram
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| 65 | Clucene: 232141. peak mem usage ~60, avg ~4mb ram
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| 66 |
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| 67 | Searching indexing using 10,000 single word queries
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| 68 | Jlucene: ~60078ms and used ~13mb ram
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| 69 | Clucene: ~48359ms and used ~4.2mb ram
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| 70 |
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| 71 | Platform notes
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| 72 | --------------
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| 73 |
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| 74 | 'Too many open files'
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| 75 | Some platforms don't provide enough file handles to run CLucene properly.
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| 76 | To solve this, increase the open file limit:
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| 77 |
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| 78 | On Solaris:
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| 79 | ulimit -n 1024
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| 80 | set rlim_fd_cur=1024
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| 81 |
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| 82 | Acknowledgments
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| 83 | ----------------
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| 84 |
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| 85 | The Apache Lucene project is the basis for this software, so the biggest
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| 86 | acknoledgment goes to that project.
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| 87 |
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| 88 | We wish to acknowledge the following copyrighted works that
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| 89 | make up portions of the CLucene software:
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| 90 |
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| 91 | CLucene relies heavily on the use of autoconf and libtool to provide
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| 92 | a build environment.
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