jon at ffconsultancy.com
Sun Jun 7 20:43:25 CEST 2009
Scott David Daniels wrote:
> Lew wrote:
>> Scott David Daniels wrote:
>>> the nub of the problem is not on the benchmarks. There is something
>>> to be said for the good old daays when you looked up the instruction
>>> timings that you used in a little document for your machine, and could
>>> know the cost of any loop. We are faster now, but part of the cost of
>>> that speed is that timing is a black art.
>> Those good old days never existed. Those manuals never accounted for
>> things that affected timing even then, like memory latency or refresh
> Well, as Gilbert and Sullivan wrote:
> - What, never?
> - No, never!
> - What, "Never"?
> - Well, hardly ever.
> Look up the LGP-30. It was quite predictable. It has been a while.
Same for early ARMs.
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
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