On 6/21/06, Fredrik Lundh <[EMAIL PROTECTED]> wrote: > Nick Coghlan wrote: > > >> BTW, prove me Decimal is not fast enough, ;) > > > > C:\Python24>python -m timeit -s "x = 1.0" "x+x" > > 10000000 loops, best of 3: 0.137 usec per loop > > > > C:\Python24>python -m timeit -s "from decimal import Decimal as d; x = > > d(1)" "x+x" > > 10000 loops, best of 3: 48.3 usec per loop > > > > I don't really know my definition of 'fast enough to be the basic floating > > point type', but I'm pretty sure that a couple of orders of magnitude slower > > isn't it. > > how fast does the corresponding C program run ?
A horribly crude test using Regina Rexx (which implements the Decimal standard in C, but I know nothing else about how): x = 1.0 do 10000000 y = x + x end This takes about 5 sec on my PC, which (if I've calculated correctly) comes out at 0.5 usec per loop. I suppose it gives a ballpark figure for the sorts of speeds we can expect from a C implementation. Paul. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
