documentation of release 0.6 was included
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----------------------------------------
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----------------------------------------
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| [Home index.html] | [CHM chm.html] | [BMZ bmz.html] | [External Memory Based Algorithm brz.html]
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| [Home index.html] | [CHM chm.html] | [BMZ bmz.html] | [BRZ Algorithm brz.html] | [FCH Algorithm fch.html]
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@ -5,4 +5,8 @@ Enjoy!
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[Davi de Castro Reis davi@users.sourceforge.net]
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[Davi de Castro Reis davi@users.sourceforge.net]
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[Djamel Belazzougui db8192@users.sourceforge.net]
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[Fabiano Cupertino Botelho fc_botelho@users.sourceforge.net]
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[Fabiano Cupertino Botelho fc_botelho@users.sourceforge.net]
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44
NEWSLOG.t2t
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NEWSLOG.t2t
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News Log
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%!includeconf: CONFIG.t2t
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----------------------------------------
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==News for version 0.6==
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- [An algorithm to generate MPHFs that require less than 4 bits per key to be stored fch.html], which is referred to as FCH algorithm. The algorithm is only efficient for small sets.
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- The FCH algorithm is integrated with [BRZ algorithm brz.html] so that you will be able to efficiently generate space-efficient MPHFs for sets in the order of billion keys.
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- All reported bugs and suggestions have been corrected and included as well.
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----------------------------------------
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==News for version 0.5==
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- A thread safe vector adapter has been added.
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- [A new algorithm for sets in the order of billion of keys that requires approximately 8.1 bits per key to store the resulting MPHFs. brz.html]
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- All reported bugs and suggestions have been corrected and included as well.
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----------------------------------------
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==News for version 0.4==
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- Vector Adapter has been added.
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- An optimized version of bmz (bmz8) for small set of keys (at most 256 keys) has been added.
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- All reported bugs and suggestions have been corrected and included as well.
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----------------------------------------
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==News for version 0.3==
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- New heuristic added to the bmz algorithm permits to generate a mphf with only
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//24.80n + O(1)// bytes. The resulting function can be stored in //3.72n// bytes.
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%html% [click here bmz.html#heuristic] for details.
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%!include: ALGORITHMS.t2t
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%!include: FOOTER.t2t
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39
README.t2t
39
README.t2t
@ -47,8 +47,8 @@ The CMPH Library encapsulates the newest and more efficient algorithms in an eas
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A very fast algorithm based on cyclic random graphs to construct minimal
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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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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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can be stored in only //4cn// bytes, where //c// is between 0.93 and 1.15.
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%html% - [External Memory Based Algorithm for sets in the order of billion of keys brz.html]
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%html% - [BRZ Algorithm brz.html].
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%txt% - BMZ Algorithm.
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%txt% - BRZ Algorithm.
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A very fast external memory based algorithm for constructing minimal perfect hash functions
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A very fast external memory based algorithm for constructing minimal perfect hash functions
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for sets in the order of billion of keys in linear time. The resulting functions are not order preserving and
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for sets in the order of billion of keys in linear time. The resulting functions are not order preserving and
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can be stored using just 8.1 bits per key.
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can be stored using just 8.1 bits per key.
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@ -57,37 +57,28 @@ The CMPH Library encapsulates the newest and more efficient algorithms in an eas
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An algorithm based on acyclic random graphs to construct minimal
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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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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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are stored in //4cn// bytes, where //c// is greater than 2.
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%html% - [FCH Algorithm fch.html].
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%txt% - FCH Algorithm.
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An algorithm to construct minimal perfect hash functions that require
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less than 4 bits per key to be stored. Although the resulting MPHFs are
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very compact, the algorithm is only efficient for small sets.
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However, it is used as internal algorithm in the BRZ algorithm for efficiently solving
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larger problems and even so to generate MPHFs that require approximately
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4.1 bits per key to be stored. For that, you just need to set the parameters -a to brz and
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-c to a value larger than or equal to 2.6.
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%html% [Click Here comparison.html] to see a comparison of the supported algorithms.
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%html% [Click Here comparison.html] to see a comparison between the algorithms BMZ and CHM.
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----------------------------------------
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----------------------------------------
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==News for version 0.5==
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==News for version 0.6==
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- A thread safe vector adapter has been added.
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- [An algorithm to generate MPHFs that require less than 4 bits per key to be stored fch.html], which is referred to as FCH algorithm. The algorithm is only efficient for small sets.
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- [A new algorithm for sets in the order of billion of keys that requires approximately 8.1 bits per key to store the resulting MPHFs. brz.html]
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- The FCH algorithm is integrated with [BRZ algorithm brz.html] so that you will be able to efficiently generate space-efficient MPHFs for sets in the order of billion keys.
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- All reported bugs and suggestions have been corrected and included as well.
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- All reported bugs and suggestions have been corrected and included as well.
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----------------------------------------
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==News for version 0.4==
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- Vector Adapter has been added.
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- An optimized version of bmz (bmz8) for small set of keys (at most 256 keys) has been added.
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- All reported bugs and suggestions have been corrected and included as well.
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----------------------------------------
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==News for version 0.3==
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- New heuristic added to the bmz algorithm permits to generate a mphf with only
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//24.80n + O(1)// bytes. The resulting function can be stored in //3.72n// bytes.
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%html% [click here bmz.html#heuristic] for details.
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----------------------------------------
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----------------------------------------
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==Examples==
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==Examples==
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2
gendocs
2
gendocs
@ -6,6 +6,7 @@ txt2tags -t html -i COMPARISON.t2t -o comparison.html
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txt2tags -t html -i GPERF.t2t -o gperf.html
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txt2tags -t html -i GPERF.t2t -o gperf.html
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txt2tags -t html -i FAQ.t2t -o faq.html
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txt2tags -t html -i FAQ.t2t -o faq.html
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txt2tags -t html -i CONCEPTS.t2t -o concepts.html
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txt2tags -t html -i CONCEPTS.t2t -o concepts.html
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txt2tags -t html -i NEWSLOG.t2t -o newslog.html
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txt2tags -t txt --mask-email -i README.t2t -o README
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txt2tags -t txt --mask-email -i README.t2t -o README
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txt2tags -t txt -i BMZ.t2t -o BMZ
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txt2tags -t txt -i BMZ.t2t -o BMZ
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@ -15,3 +16,4 @@ txt2tags -t txt -i COMPARISON.t2t -o COMPARISON
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txt2tags -t txt -i GPERF.t2t -o GPERF
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txt2tags -t txt -i GPERF.t2t -o GPERF
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txt2tags -t txt -i FAQ.t2t -o FAQ
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txt2tags -t txt -i FAQ.t2t -o FAQ
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txt2tags -t txt -i CONCEPTS.t2t -o CONCEPTS
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txt2tags -t txt -i CONCEPTS.t2t -o CONCEPTS
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txt2tags -t txt -i NEWSLOG.t2t -o NEWSLOG
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