Oleg Bartunov wrote:
your polish_english, polish configurations uses ispell language
and slow, while english configuration doesn't contains ispell.
So, what's your complains ? Try add ispell dictionary to english
configuration and see timings.
Oh, so this is not anomalous ? These are the expected speeds for an
ispell dictionary ? I didn't realize that. Sorry for the bother
then. It just seemed way too slow to be practical.
You can see real timings using ts_lexize() function for different
dictionaries (try several time to avoid cold-start problem) instead
of ts_headline(), which involves other factors.
On my test machine I see no real difference between very simple
dictionary and french ispell, snowball dictionaries:
ts_lexize seems to be just as fast for simple, polish_ispell and
english_stem with the 'voila' argument.
polish_ispell is in fact *faster* for the lorem ipsum text repeated a
couple times (10 ?). Which suggests that the issue is with ts_headline
iteself.
I see no big difference in ts_headline as well:
dev-oleg=# select ts_headline('english','I can do voila',
'voila'::tsquery);
ts_headline
-----------------------
I can do <b>voila</b>
(1 row)
Time: 0.265 ms
Yes, for 4-word texts the results are similar.
Try that with a longer text and the difference becomes more and more
significant. For the lorem ipsum text, 'polish' is about 4 times slower,
than 'english'. For 5 repetitions of the text, it's 6 times, for 10
repetitions - 7.5 times...
This is 8.4.1 version of PostgreSQL.
An that was 8.3.8/OSX.
cheers,
Wojciech Knapik
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