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Subject: Re: Fritz 5.32 hashtable reach 100%, then what?

Author: Dave Gomboc

Date: 18:11:55 08/09/99

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On August 09, 1999 at 15:43:58, Vincent Diepeveen wrote:

>Also that 100% can't be correct. It's seeminglessly just dividing
>the number of hashtable writes nodes by the number of tuples and if that's
>>= 1 then it puts it at 100%.
>
>However practically spoken this is impossible because of chaining.
>So it should be more like 90% for a long period of time and then slowly
>get up. 100% should take up to an hour sometimes if hashsize is huge.

It really depends on what's being reported.  A moving average of the collision
rate of the last N attempted inserts would reach 100% sooner than your measure
would.  Such a statistic is a valid and useful measure of hash permeability.

Dave



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