On Jun 5, 11:14 am, Daniel Lyons <fus...@storytotell.org> wrote:
> On Jun 5, 2009, at 8:56 AM, Daniel Jomphe wrote:
>
> > I need to generate a list of all possible American zipcodes, MD5-
> > digested. Later on, I will need to do much more involving stuff,
> > processor-wize, with this. But already, generating a naive list of all
> > possible zipcodes is taking quite a deal of time:
>
> Your code, stylistically, looks fine to me, though I'm not that
> seasoned. I had run into an issue with performance with my file
> duplicate finder which I think ultimately is Java's fault because the
> built-in MD5 function isn't very fast.
>
> I would give you two pointers:
>
> 1. Use Fast MD5:
>
> <http://www.twmacinta.com/myjava/fast_md5.php>
>
> This made the biggest difference with my file dup finder. I still
> think there are performance gains on the table but I don't know what
> they are.
>
This is good:
> 2. Winnow out invalid zip codes. Not every number between
00000-0000
> and 99999-9999 are valid zip codes. It might be better just to get
a
> list of valid zip codes from somewhere else, because I'm not sure
what
> the rules are exactly. I found this list by googling around:
>
> <http://www.census.gov/tiger/tms/gazetteer/zips.txt>
>
> I'm not sure if you can get a list of zip+4's as easily, but at
29,470
> records, you're saving yourself 70,592 * 1000 MD5 calculations by
just
> starting with this list. Plus this list gives you some auxiliary
data
> that can't be inferred from the number by itself, like state and
> county and the lat/lon coordinates.
Eliminating 70% of the work is the way to go.
> Hope that helps,
>
> —
> Daniel Lyonshttp://www.storytotell.org-- Tell It!
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