Re: gaussian distribution pgbench
От | Fabien COELHO |
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Тема | Re: gaussian distribution pgbench |
Дата | |
Msg-id | alpine.DEB.2.10.1407181449440.15105@sto обсуждение исходный текст |
Ответ на | Re: gaussian distribution pgbench (Robert Haas <robertmhaas@gmail.com>) |
Ответы |
Re: gaussian distribution pgbench
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Список | pgsql-hackers |
Please find attached 2 patches, which are a split of the patch discussed in this thread. (A) add gaussian & exponential options to pgbench \setrandom the patch includes sql test files. There is no change in the *code* from previous already reviewed submissions, so I do not think that it needs another review on that account. However I have (yet again) reworked the *documentation* (for Andres Freund & Robert Haas), in particular both descriptions now follow the same structure (introduction, formula, intuition, rule of thumb and constraint). I have differentiated the concept and the option by putting the later in <literal> tags, and added a link to the corresponding wikipedia pages. Please bear in mind that: 1. English is not my native language. 2. this is not easy reading... this is maths, to read slowly:-)3. word smithing contributions are welcome. I assume somehow that a user interested in gaussian & exponential distributions must know a little bit about probabilities... (B) add pgbench test variants with gauss & exponential. I have reworked the patch so as to avoid copy pasting the 3 test cases, as requested by Andres Freund, thus this is new, although quite simple, code. I have also added explanations in the documentation about how to interpret the "decile" outputs, so as to hopefully address Robert Haas comments. -- Fabien.
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