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Subject: Re: Gambit 2 and hash tables

Author: Robert Raese

Date: 20:05:45 04/29/01

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On April 29, 2001 at 13:31:51, Christophe Theron wrote:

>On April 29, 2001 at 01:21:21, Feivel Avrum wrote:
>
>>I have been testing Gambit with differing hash sizes and have come to
>>conclusions I do not exactly understand. The NPS varies depending on the free
>>memory, free resources, load on CPU etc. Yet the "pattern" when using different
>>size hash tables remains fairly constant. The results on a machine with 256 Meg
>>RAM are:
>>
>>HT   Difference from baseline in NPS
>>  1  +10K
>>  3   +8K
>>  6   +5K
>> 12   +2K
>> 24    0 (Base)
>> 48   -4K
>> 96   -7K
>>192  -17K
>>
>>Can someone please explain the meaning and significance of these results.
>>
>>Feivel
>
>
>
>This behaviour is absolutely normal.
>
>What you need to know is that the decrease in NPS coming from bigger hash tables
>is widely offset by the decrease in the size of the tree.

pardon my ignorance... why does the size of the tree decrease?




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