Help me choose a C++ compiler to work with Python

Fernando Perez fperez528 at yahoo.com
Thu Sep 25 01:29:30 CEST 2003


rhmd wrote:


> 
> MORE DETAIL ON MY QUESTION

>  At
> any rate, there are some calculations where I need a LOT of speed,
> e.g. generating billions (with a B) of random numbers with the
> Mersenne Twister algorithm

Off the top of my head I don't know which rng RandomArray (part of Numeric)
uses, but its speed is not that bad:

In [20]: def rloop(n,m):
   ....:     random = RA.random
   ....:     size=10**m
   ....:     for i in xrange(10**n):
   ....:         _=random(size)
   ....:

In [21]: timing (1,rloop,1,5)  # times are in cpu seconds
Out[21]: 0.12000000000000455

In [22]: timing (1,rloop,2,5)
Out[22]: 1.1999999999999957

In [23]: timing (1,rloop,3,5)
Out[23]: 12.469999999999999


The scaling is pretty linear, so for a billion terms you'd need about 2
minutes.

hth.

Cheers,

f




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