I don't know if this is your main problem, but performance for SQLite is poor when doing multiple inserts (see the performance notes in DBD::SQLite). Wrap all of those inserts in a transaction and commit them all at once. I see you have some commit calls in there, but I didn't see where you set up a transaction.

Also, if you think the database might be the culprit, you can profile it with DBI::Profile. I give some examples of that in my Profiling chapter in Mastering Perl. You might also try some of the other profiling techniques to identify other slow parts.

Good luck :)

--
brian d foy <brian@stonehenge.com>
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In reply to Re: std dev calculations slow over time by brian_d_foy
in thread std dev calculations slow over time by punkish

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