Never believe any statement containing the words "never" or "always," including this one. (23)

Ben, I have to disagree with you on this. I have worked with a number of PICK installations that always use type 18. I can frequently find a better hash type for their files with a bit of effort. (MHC installations are *easy* performance improvement sites, for example.)

The file types are there to be used, not ignored.

As to modulos (modulii?)--odd numbers ending in other than five are not necessarily prime. Prime numbers tend to work best in an algorithm based on a modulus divide. Choose the next largest prime number.

If thinking about file parameters is too much effort, I highly recommend FAST by Fitzgerald & Long.

--

Regards,

Clif

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
W. Clifton Oliver, CCP
CLIFTON OLIVER & ASSOCIATES
Tel: +1 619 460 5678    Web: www.oliver.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


On Aug 13, 2004, at 15:44, Rosenberg Ben wrote:

You'll almost never have bad (clumpy) hashing if you use type 18
(which is the default type in PICK and REALITY flavor)
and if you use a modulo whose last digit is 1, 3, 7, or 9
(that is, any odd number not ending in 5.)
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