[LMB] Programming, was: Re: OT: Afterlife
lmb at matija.com
Mon Nov 2 18:19:22 GMT 2020
On 11/2/20 1:45 PM, WalterStuartBushell wrote:
> Apparently speeding up processors is cheaper than speeding up RAM.
You claim that you received TWO "nanoseconds" from Admiral Hopper, but
you still haven't learned the lesson they were intended to teach.
A "nanosecond" admiral Hopper handed out was about 30 cm of wire, the
distance light travels in vacuum, in one nanosecond.
Electricity in conductor travels slower than that. With the CPU
frequencies of 3-4 GHz, one cycle is one third to one quarter of a
second, so the signals can travel AT MOST 8-10 centimeters in that time
(and probably noticeably less). It's not about making memory faster
(well, sure it is, a bit, but...), it's physically about how far signals
have to travel to get to memory and back.
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