Tools

Sphinxsearch

From personal use

verify that indexes have to be rebuild localy
- especially sharing indexes between 32 and 64bits instances
Cookbook:Sphinx
on Debian Squeeze the PHP API is not included but can be downloaded with tests in the branch of the installed version (here 0.9.9)
- else consider the trunk
even though sorting by RELEVANCE is available from the indexer by default via the API it still requires to properly select the matching mode SPH_MATCH_EXTENDED2 and the ranking mode e.g. SPH_RANK_PROXIMITY_BM25
- it can be tricky at first since results all have the same weight thus are properly rank... by document ID (thus mostly randomly)
used as Keywords#brain
- interface as pim_search.php
- should consequently update browser_queries
- clarify the setup
  - add pmwiki-to-sphinxxml and sphinx_sources
  - usage of crontab for rsync then indexer
note that inheritance in the configuration only apply to parameters, new indexes still have to be generated from scratch thus takes about the same resource
Steps (with their specific vocabulary)
1. pick data sources
2. create and test driver with its pitfalls
3. configure sphinx to load the drivers
4. run the drivers through the indexer
5. make the indexer result available through searchd
6. query searchd via the api
7. encapsulate the query and its results in an interface
Details on this installation
- disabled mysql, only used for test1 tried during installation and configuration
- indexer --all --rotate to avoid having to manually stop and start it again, done via Crontab
  - still seems to create some down time, to check
- performances
```
collected 1962 docs, 26.5 MB, sorted 4.5 Mhits, total 1962 docs, 26545570 bytes
total 17.149 sec, 1547933 bytes/sec, 114.40 docs/sec
total 28 reads, 0.052 sec, 430.9 kb/call avg, 1.8 msec/call avg
total 34 writes, 0.126 sec, 768.6 kb/call avg, 3.7 msec/call avg
```
- real 3m1.913s/user 0m28.142s/sys 0m15.921s for indexer --all --rotate
- average of 0.001second per query and always under 0.1sec including the first query of the day
  - see query.log for details

To explore

recommendation of PIM pages via Greasemonkey GM_xmlhttpRequest() regarding the current visited page
distributed indexes
- go beyond rsync
- yet with privacy concerns, thus first to keep under a protected path then split
- particularly useful if local failover is possible
own ideas LearningSearch
indexer --buildstops output.txt N --buildfreqs as a way to replace shell_scripts/pmwiki_keywords_distribution
- N=20 found words less than 3 char and "utopiah"
- might not be that relevant when then index mixes 3 very different sources
Introduction to Search with Sphinx by Andrew Aksyonoff, O'Reilly Media April 2011
Wikipedia:Inverted index
tutorial or review of Sphinx for desktop search
- e.g. using man:pdftotext
Best Practices for several servers, Sphinx forum
Why is internal search so hard? by Espen Andersen, Applied Abstractions February 2012
http://www.mediawiki.org/wiki/Extension:SphinxSearch/Page_rank
- to adapt for PmWiki

Fabien Benetou's PIM

Sphinxsearch

From personal use

To explore

See also

Note