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Subject: Re: Matt Taylor's magic de Bruijn Constant

Author: Vincent Diepeveen

Date: 07:54:49 07/14/03

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On July 13, 2003 at 17:10:10, Russell Reagan wrote:

>On July 13, 2003 at 13:17:56, Bas Hamstra wrote:
>
>>It is used *extremely* intensive. Therefore I assumed that most of the time the
>>table sits in cache. But apparently no... Makes you wonder about other simple
>>lookup's. A lot of 10 cycle penalties, it seems.
>
>Hi Bas,
>
>Why you say "10 cycles"? I thought memory latency was many more cycles (~75 -
>150+).

Random read from memory at dual P4 or dual K7 is like nearly 400 nanoseconds.
So that's at 2Ghz around 800 cycles.

Best regards,
Vincent



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