> And was certainly fit for purpose, only problem is, as 
> expected it 'hosed' the CPU ;-> Until I tell it not to run at 
> full whack then this is going to happen no matter what the 
> spec of the machine I suppose. 

Pegging the CPU to the endstop is seldom an issue, so long as the heavy
thread yields often enough to allow everything else to remain
responsive.

You have the hardware there, and you are pumping electrons through it
anyway, so you might as well use it all if that's what it takes to get
the job done... That's assuming what you are doing is heavy number
crunching, of course.

On the other hand, if your calculation only needs to be done at a fixed
rate, maybe you should be looking at Fl::add_timeout() to see about
running updates via a timer?


> I have just told the program 
> to 'GO' so I think I could afford to cap the framerate (if 
> that is accessible in FLTK?) a little and reduce CPU that 
> way, but I think the clear answer is really to go with the 
> multithreading.

Even with multiple threads, if your calculation does not need all the
CPU you might want to think about using timers to schedule appropriate
updates and recalculation periods...




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