From: Ben Bleything <ben@...>
Date: 2008-02-21T07:55:34+09:00
Subject: Re: IP Address to Decimal - inject sucks

On Thu, Feb 21, 2008, Ryan Davis wrote:
> Ara's pack/unpack is always what I intuitively reach for in a problem  
> like this, but it turns out to be more expensive than a simple map/ 
> left-shift form. IPAddr is very powerful, but there is a cost to that  
> power (parsing every IP form under the sun). If I needed anything more  
> than JUST converting to/from ints I'd use IPAddr.
> 
> # of iterations = 100000
>                             user     system      total        real
> null_time               0.020000   0.000000   0.020000 (  0.017184)
> split/map/<<+           1.040000   0.000000   1.040000 (  1.042783)
> split/map/pack/unpack   1.180000   0.000000   1.180000 (  1.177197)
> split/inject/<<+        1.310000   0.000000   1.310000 (  1.308850)
> split/inject/+*         1.430000   0.010000   1.440000 (  1.436653)
> split/inject/+*=        1.640000   0.000000   1.640000 (  1.637948)
> split/zip/inject/+*     2.290000   0.000000   2.290000 (  2.288469)
> ohdeargodno             2.670000   0.000000   2.670000 (  2.678789)
> ipaddr/to_i             3.940000   0.010000   3.950000 (  3.950504)

Awesome!  Glad to see I was able to provide the slowest solution ;)

Ben