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Subject: Re: Build language with weak typing, then add scaffolding later to
 strengthen it?
From: jan.de.kruyf@gmail.com
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Date: 2015-05-29T03:23:41-07:00
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On Friday, May 29, 2015 at 11:27:54 AM UTC+2, Simon Wright wrote:

> To me, 6 us didn't seem too bad. You have to pay for using high-level
> constructs (high-ish, in the case of Ravenscar, of course).

Perhaps it was one of my notorious impercise expressions. I should have said "instructions" or may be "cpu cycles"
> 
> But then, I remember the manual-guide-torpedo-by-wire system where the
> team were pleased they'd got the feedback loop time (move joystick to
> response from torpedo on screen) down from 50 s to 15 s. When asked
> whether he found it a problem, the CPO said that submariners are used to
> taking things slowly :-)

In my previous life I was an officer at sea. I once stood for about 3 or 4 minutes waiting patiently for a big crash that could not be avoided anymore.
We fully knew the magnitude of the error, but the PID output was limiting, so to speak.

> 
> I should add, the RTS that I timed is based on FreeRTOS. Guess I should
> do the same timing with AdaCore's RTS.

Perhaps, but you will also find things.
Here it is not a matter of having a bigger amplifier. I have to accept that technology that works well in a washing machine, is too slow for a high speed set-up. And I will have to adapt the basic premises of my technology.

j.