[Python-Dev] Decimal news: speedup and stabilization (original) (raw)
Facundo Batista facundobatista at gmail.com
Fri Nov 23 19:19:54 CET 2007
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Hi people!
Two news. A big speed up, and now we reached some stable state.
Mark Dickinson found out that a lot of time was lost internally in decimal.py when dealing with the Decimal mantissas.
He changed the way that mantissa was stored, from a tuple of ints, to a plain string (each character a digit). This achieved a speedup of around a 40%!!!
Three notes:
The speedup was measured using two tools I created [*], one basically tries a lot of use cases, the other use the specification test cases. Both generate a .py which actually measures the times.
No API was changed, and this a good thing, :)
The change is somewhat big. But as the speedup is important, and the API es untouched, I considered it was something that worths it.
After several months with a lot of work here, no more big changes are planned to this module, so I will backport it to 2.5.3 (when the trunk gets unfrozen). Note that the module complies with the latest specification and with the latest test cases (that are from one month ago!).
Thanks Mark for all your effort here!
[*] http://tools.assembla.com/svn/homedevel/decimal/
Regards,
-- . Facundo
Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/
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