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FAQ.t2t
7
FAQ.t2t
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@ -25,7 +25,12 @@ one is executed?
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the cmph_config_set_hashfuncs. Therefore, the default hash function
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is reset when you call the cmph_config_set_algo function.
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- What do I do when the following error is got?
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- Error: **error while loading shared libraries: libcmph.so.0: cannot open shared object file: No such file ordirectory**
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- Solution: type **export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/** at the shell or put that shell command
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in your .profile file or in the /etc/profile file.
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%!include: ALGORITHMS.t2t
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%!include: FOOTER.t2t
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89
README.t2t
89
README.t2t
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@ -51,7 +51,7 @@ The CMPH Library encapsulates the newest and more efficient algorithms in an eas
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%txt% - BMZ Algorithm.
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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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can be stored using just 8.1 bits per key. **This algorithm is available just in the CVS for while**.
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can be stored using just 8.1 bits per key.
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%html% - [CHM Algorithm chm.html].
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%txt% - CHM Algorithm.
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An algorithm based on acyclic random graphs to construct minimal
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@ -61,6 +61,15 @@ The CMPH Library encapsulates the newest and more efficient algorithms in an eas
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%html% [Click Here comparison.html] to see a comparison of the supported algorithms.
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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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@ -88,29 +97,29 @@ Using cmph is quite simple. Take a look.
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```
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#include <cmph.h>
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#include <string.h>
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// Create minimal perfect hash function from in-memory vector
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int main(int argc, char **argv)
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{
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{
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// Creating a filled vector
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const char *vector[] = {"aaaaaaaaaa", "bbbbbbbbbb", "cccccccccc", "dddddddddd", "eeeeeeeeee",
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const char *vector[] = {"aaaaaaaaaa", "bbbbbbbbbb", "cccccccccc", "dddddddddd", "eeeeeeeeee",
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"ffffffffff", "gggggggggg", "hhhhhhhhhh", "iiiiiiiiii", "jjjjjjjjjj"};
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unsigned int nkeys = 10;
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// Source of keys
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cmph_io_adapter_t *source = cmph_io_vector_adapter(vector, nkeys);
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cmph_io_adapter_t *source = cmph_io_vector_adapter((char **)vector, nkeys);
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//Create minimal perfect hash function using the default (chm) algorithm.
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cmph_config_t *config = cmph_config_new(source);
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cmph_t *hash = cmph_new(config);
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cmph_config_destroy(config);
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//Find key
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const char *key = "jjjjjjjjjj";
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unsigned int id = cmph_search(hash, key, strlen(key));
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fprintf(stderr, "Id:%u\n", id);
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//Destroy hash
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cmph_destroy(hash);
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free(source);
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cmph_io_vector_adapter_destroy(source);
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return 0;
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}
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```
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@ -120,33 +129,33 @@ Download [vector_adapter_ex1.c examples/vector_adapter_ex1.c]. This example does
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```
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#include <cmph.h>
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#include <stdio.h>
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// Create minimal perfect hash function from in-disk keys using BMZ algorithm
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#include <string.h>
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// Create minimal perfect hash function from in-disk keys using BMZ algorithm
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int main(int argc, char **argv)
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{
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//Open file with newline separated list of keys
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{
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//Open file with newline separated list of keys
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FILE * keys_fd = fopen("keys.txt", "r");
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cmph_t *hash = NULL;
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if (keys_fd == NULL)
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if (keys_fd == NULL)
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{
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fprintf(stderr, "File \"keys.txt\" not found\n");
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exit(1);
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}
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fprintf(stderr, "File \"keys.txt\" not found\n");
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exit(1);
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}
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// Source of keys
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cmph_io_adapter_t *source = cmph_io_nlfile_adapter(keys_fd);
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cmph_config_t *config = cmph_config_new(source);
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cmph_config_set_algo(config, CMPH_BMZ);
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hash = cmph_new(config);
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cmph_config_destroy(config);
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//Find key
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const char *key = "jjjjjjjjjj";
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unsigned int id = cmph_search(hash, key, strlen(key));
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fprintf(stderr, "Id:%u\n", id);
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//Destroy hash
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cmph_destroy(hash);
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free(source);
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cmph_io_nlfile_adapter_destroy(source);
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fclose(keys_fd);
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return 0;
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}
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@ -176,26 +185,32 @@ utility.
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```
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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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usage: cmph [-v] [-h] [-V] [-k nkeys] [-f hash_function] [-g [-c value][-s seed] ] [-a algorithm] [-M memory_in_MB] [-b BRZ_parameter] [-d tmp_dir] [-m file.mph] 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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* bmz
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* chm
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-f hash function (may be used multiple times) - valid values are
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* djb2
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* fnv
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* jenkins
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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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-g generation mode
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-s random seed
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-m minimum perfect hash function file
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keysfile line separated file with keys
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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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* bmz
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* bmz8
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* chm
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* brz
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-f hash function (may be used multiple times) - valid values are
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* djb2
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* fnv
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* jenkins
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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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-g generation mode
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-s random seed
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-m minimum perfect hash function file
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-M main memory availability (in MB)
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-d temporary directory used in brz algorithm
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-b parmeter of BRZ algorithm to make the maximal number of keys in a bucket lower than 256
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keysfile line separated file with keys
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```
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==Additional Documentation==
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