It was fixed some English mistakes and It was included the files BMZ.t2t, CZECH.t2t and COMPARISON.t2t
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BMZ Algorithm
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----------------------------------------
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**History**
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**The Algorithm**
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**The Heuristic**
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**Papers**
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----------------------------------------
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[Home README.html]
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----------------------------------------
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Enjoy!
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Davi de Castro Reis
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Fabiano Cupertino Botelho
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%preproc(html): '^%html% ' ''
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%html% <a href="http://sourceforge.net"><img src="http://sourceforge.net/sflogo.php?group_id=96251&type=1" width="88" height="31" border="0" alt="SourceForge.net Logo" /></a>
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Last Updated: %%date(%c)
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After Width: | Height: | Size: 513 B |
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Comparison Between BMZ And CZECH Algorithms
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----------------------------------------
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**Features**
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**Constructing Minimal Perfect Hash Functions**
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**Memory Consumption**
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**Run times**
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----------------------------------------
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[Home README.html]
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----------------------------------------
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Enjoy!
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Davi de Castro Reis
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Fabiano Cupertino Botelho
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%preproc(html): '^%html% ' ''
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%html% <a href="http://sourceforge.net"><img src="http://sourceforge.net/sflogo.php?group_id=96251&type=1" width="88" height="31" border="0" alt="SourceForge.net Logo" /></a>
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Last Updated: %%date(%c)
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@ -0,0 +1,24 @@
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CZECH Algorithm
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----------------------------------------
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**History**
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**The Algorithm**
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**Papers**
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----------------------------------------
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[Home README.html]
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----------------------------------------
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Enjoy!
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Davi de Castro Reis
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Fabiano Cupertino Botelho
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%preproc(html): '^%html% ' ''
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%html% <a href="http://sourceforge.net"><img src="http://sourceforge.net/sflogo.php?group_id=96251&type=1" width="88" height="31" border="0" alt="SourceForge.net Logo" /></a>
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Last Updated: %%date(%c)
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91
README.t2t
91
README.t2t
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== cmph - C Minimal Perfect Hashing Library ==
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CMPH - C Minimal Perfect Hashing Library
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----------------------------------------
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**Description**
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C Minimal Perfect Hashing Library is a portable LGPLed library to create and
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work with minimal perfect hashes. The cmph library encapsulates the newest
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and more efficient algorithms in the literature in a ease-to-use,
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production-quality, fast API. The library is designed to work big entries that
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won't fit in the main memory. It has been used successfully to create hashes
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bigger than 100 million entries. Although there is a lack of similar libraries
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in the free software world, we can point out some of the "distinguishing"
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to work with minimal perfect hashing functions. The cmph library encapsulates the newest
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and more efficient algorithms (available in the literature) in an easy-to-use,
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production-quality and fast API. The library is designed to work with big entries that
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can not be fit in the main memory. It has been used successfully for constructing minimal perfect
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hashing functions for sets with more than 100 million of keys.
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Although there is a lack of similar libraries
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in the free software world, we can point out some of the distinguishable
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features of cmph:
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- Fast
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- Space-efficient with main memory usage carefully documented
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- The best modern algorithms are available (or at least scheduled for implementation :-))
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- Works with in-disk key sets through use of adapter pattern
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- Serialization of hash functions
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- Portable C code (currently works on GNU/Linux and WIN32)
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- Object oriented implementation
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- Easily extensible
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- Well encapsulated API aiming binary compatibility through releases
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- Free Software
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- Fast.
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- Space-efficient with main memory usage carefully documented.
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- The best modern algorithms are available (or at least scheduled for implementation :-)).
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- Works with in-disk key sets through of using the adapter pattern.
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- Serialization of hash functions.
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- Portable C code (currently works on GNU/Linux and WIN32).
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- Object oriented implementation.
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- Easily extensible.
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- Well encapsulated API aiming binary compatibility through releases.
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- Free Software.
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----------------------------------------
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**Supported Algorithms**
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- [BMZ Algorithm BMZ.html]. A very fast algorithm based on cyclic random graphs to construct minimal
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perfect hash functions in linear time. The resulting functions are not order preserving and
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can be stored in only 4cn bytes, where c is between 0.93 and 1.15.
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- [CZECH Algorithm CZECH.html]. An algorithm based on acyclic random graphs to construct minimal
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perfect hash functions in linear time. The resulting functions are order preserving and
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are stored in 4cn bytes, where c is greater than 2.
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[Click Here COMPARISON.html] to see a comparison of the supported algorithms.
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----------------------------------------
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**News for version 0.3**
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- New heuristics in bmz algorithm, providing hash creation with only
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(0.93 * 16 + 4)*n bytes and hash query with (0.93*4)n bytes
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- New heuristic added to the bmz algorithm permits to generate a mphf with only
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(xxx)*n bytes. The resulting function can be stored in (0.93*4)n bytes.
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[click here BMZ.html] for details.
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----------------------------------------
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**Examples**
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Using cmph is quite ease. Take a look.
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Using cmph is quite simple. Take a look.
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```
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// Create minimal perfect hash from in-memory vector
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// Create minimal perfect hash function from in-memory vector
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#include <cmph.h>
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...
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@ -44,7 +68,7 @@ Using cmph is quite ease. Take a look.
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//Fill vector
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//...
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//Create minimal perfect hash
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//Create minimal perfect hashing function using the default(czech) algorithm.
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cmph_config_t *config = cmph_config_new(cmph_io_vector_adapter(vector, nkeys));
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cmph_t *hash = cmph_new(config);
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cmph_config_destroy(config);
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@ -59,7 +83,7 @@ Using cmph is quite ease. Take a look.
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-------------------------------
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```
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// Create minimal perfect hash from in-disk keys using BMZ algorithm
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// Create minimal perfect hash function from in-disk keys using BMZ algorithm
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#include <cmph.h>
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...
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@ -83,18 +107,18 @@ Using cmph is quite ease. Take a look.
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```
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--------------------------------------
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**The cmph application**
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cmph is the name of both the library and the utility
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application that comes with this package. You can use the cmph
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application to create minimal perfect hashes from command line. The cmph utility
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comes with a number of flags, but it is very simple to create and query
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minimal perfect hashes:
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application for constructing minimal perfect hashing functions from the command line.
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The cmph utility
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comes with a number of flags, but it is very simple to create and to query
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minimal perfect hashing functions:
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```
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$ # Create mph for keys in file keys_file
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$ ./cmph keys_file
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$ # Using the czech algorithm (default one) for constructing a mphf for keys in file keys_file
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$ ./cmph -g keys_file
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$ # Query id of keys in the file keys_query
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$ ./cmph -m keys_file.mph keys_query
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```
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```
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usage: cmph [-v] [-h] [-V] [-k] [-g [-s seed] ] [-m file.mph] [-a algorithm] keysfile
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usage: cmph [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-m file.mph] [-a algorithm] keysfile
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Minimum perfect hashing tool
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-h print this help message
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-c c value that determines the number of vertices in the graph
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-a algorithm - valid values are
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* czech
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* bmz
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* czech
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-f hash function (may be used multiple times) - valid values are
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* jenkins
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* djb2
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* sdbm
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* fnv
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* glib
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* jenkins
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* pjw
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* sdbm
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-V print version number and exit
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-v increase verbosity (may be used multiple times)
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-k number of keys
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Use the project page at sourceforge: http://sf.net/projects/cmph
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**License Stuff**
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Code is under the LGPL.
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