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

Author: Vincent Diepeveen

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

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

Re: Matt Taylor's magic de Bruijn Constant Gerd Isenberg 12:33:37 07/14/03
- Re: Matt Taylor's magic de Bruijn Constant Vincent Diepeveen 03:20:28 07/15/03
  - Re: Matt Taylor's magic de Bruijn Constant Robert Hyatt 06:30:36 07/15/03
- Re: Matt Taylor's magic de Bruijn Constant Robert Hyatt 13:07:27 07/14/03
  - Re: Matt Taylor's magic de Bruijn Constant Matt Taylor 14:45:21 07/20/03
  - Re: Matt Taylor's magic de Bruijn Constant Gerd Isenberg 09:06:30 07/15/03
    - Re: Matt Taylor's magic de Bruijn Constant Matt Taylor 14:37:26 07/20/03
    - Re: Matt Taylor's magic de Bruijn Constant Robert Hyatt 10:27:28 07/15/03
  - Source code to measure it Vincent Diepeveen 03:24:58 07/15/03
    - Re: Source code to measure it - results Gerd Isenberg 12:24:19 07/15/03
      - Re: Source code to measure it - results Vincent Diepeveen 17:19:34 07/15/03
        
        Re: Source code to measure it - results Jeremiah Penery 18:13:23 07/15/03
        
        Re: Source code to measure it - results Andrew Dados 22:39:34 07/15/03
        
        Re: Source code to measure it - results Robert Hyatt 09:08:58 07/16/03
        
        Re: Source code to measure it - results Tony Werten 00:43:57 07/17/03
        
        Re: Source code to measure it - results Robert Hyatt 14:58:21 07/17/03
        
        Re: Source code to measure it - results Vincent Diepeveen 19:34:18 07/15/03
        
        Re: Source code to measure it - results Vincent Diepeveen 20:05:37 07/15/03
        
        Re: Source code to measure it - results Robert Hyatt 20:35:30 07/15/03
        
        Re: Source code to measure it - results Keith Evans 21:05:29 07/15/03
        
        Re: Source code to measure it - results Robert Hyatt 21:29:43 07/15/03
        
        Re: Source code to measure it - results Keith Evans 21:44:34 07/15/03
        
        Re: Source code to measure it - results Robert Hyatt 07:29:07 07/16/03
        
        Re: Source code to measure it - results Keith Evans 09:58:33 07/16/03
        
        Re: Source code to measure it - results Robert Hyatt 11:36:56 07/16/03
        
        Re: Source code to measure it - results Vincent Diepeveen 04:20:50 07/16/03
        
        Re: Source code to measure it - results Keith Evans 10:04:40 07/16/03
        
        Precharging at DDR ram Vincent Diepeveen 19:40:10 07/16/03
        
        Re: Precharging at DDR ram Keith Evans 21:26:21 07/16/03
        
        Re: Precharging at DDR ram Robert Hyatt 14:56:00 07/17/03
        
        Re: Precharging at DDR ram Vincent Diepeveen 04:51:05 07/17/03
        
        Re: Precharging at DDR ram Robert Hyatt 14:56:52 07/17/03
        
        Re: Source code to measure it - results Robert Hyatt 11:37:44 07/16/03
    - Re: Source code to measure it Gerd Isenberg 07:25:25 07/15/03
      - Re: Source code to measure it Vincent Diepeveen 17:04:40 07/15/03
    - Re: Source code to measure it Robert Hyatt 06:33:39 07/15/03
      - Re: Source code to measure it Gerd Isenberg 14:14:45 07/15/03
        
        Re: Source code to measure it Robert Hyatt 17:06:36 07/15/03
        
        RAM properties Vincent Diepeveen 04:13:14 07/16/03
        
        Re: RAM properties Robert Hyatt 07:31:09 07/16/03
        
        Re: RAM properties Vincent Diepeveen 13:46:54 07/16/03
        
        Re: RAM properties Robert Hyatt 15:22:34 07/16/03
        
        Re: RAM properties Vincent Diepeveen 05:12:55 07/17/03
        
        Re: RAM properties Robert Hyatt 14:50:29 07/17/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 14:58:01 07/15/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 17:26:28 07/15/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 05:04:49 07/16/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 05:12:43 07/16/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 11:18:23 07/16/03
        
        Re: Source code to measure it - there is something wrong Dieter Buerssner 11:41:45 07/16/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 13:45:18 07/16/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 14:48:20 07/17/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 12:40:07 07/16/03
        
        Re: Source code to measure it - there is something wrong Dieter Buerssner 13:12:45 07/16/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 15:25:51 07/16/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 05:07:07 07/17/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 14:23:37 07/17/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 23:17:29 07/16/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 14:26:50 07/17/03
        
        Re: Source code to measure it - there is something wrong Keith Evans 14:37:33 07/17/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 15:27:54 07/17/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 13:40:47 07/16/03
        
        Re: Source code to measure it - there is something wrong Gerd Isenberg 12:25:08 07/16/03
        
        oups - sorry Vincent Gerd Isenberg 13:14:16 07/16/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 20:50:01 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 17:08:57 07/15/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 17:30:04 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 20:37:53 07/15/03
        
        Re: Source code to measure it - there is something wrong Keith Evans 17:58:18 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 20:39:22 07/15/03
        
        Re: Source code to measure it - there is something wrong Vincent Diepeveen 19:25:01 07/15/03
        
        Re: Source code to measure it - there is something wrong Keith Evans 21:02:35 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 21:31:28 07/15/03
        
        Re: Source code to measure it - there is something wrong Ricardo Gibert 22:01:55 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 07:33:37 07/16/03
        
        Re: Source code to measure it - there is something wrong Ricardo Gibert 22:34:52 07/15/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 07:33:58 07/16/03
        
        Re: Source code to measure it - there is something wrong Robert Hyatt 20:41:36 07/15/03
  - Re: Matt Taylor's magic de Bruijn Constant Gerd Isenberg 13:52:50 07/14/03
    - Re: Matt Taylor's magic de Bruijn Constant Vincent Diepeveen 03:26:54 07/15/03
      - Re: Matt Taylor's magic de Bruijn Constant Robert Hyatt 06:35:16 07/15/03
  - Re: Matt Taylor's magic de Bruijn Constant Eugene Nalimov 13:32:20 07/14/03
    - Re: Matt Taylor's magic de Bruijn Constant Robert Hyatt 21:29:03 07/14/03
      - Re: Matt Taylor's magic de Bruijn Constant Eugene Nalimov 21:57:11 07/14/03

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