[Python-Dev] [Python-checkins] cpython: Issue #7652: Integrate the decimal floating point libmpdec library to speed (original) (raw)

Victor Stinner victor.stinner at gmail.com
Mon Mar 26 01:03:46 CEST 2012

The 80x is a ballpark figure for the maximum expected speedup for standard numerical floating point applications.

Ok, but it's just surprising when you read the What's New document. 72x and 80x look to be inconsistent.

For huge numbers decimal is also faster than int:

factorial(1000000): decimal, calculation time: 6.844487905502319 decimal, tostr():          0.033592939376831055 int, calculation time: 17.96010398864746 int, tostr(): ... still running ...

Hum, with a resolution able to store the result with all digits? If yes, would it be possible to reuse the multiply algorithm of _decimal (and maybe of other functions) for int? Or does it depend heavily on _decimal internal structures?

Victor

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