On Mon, Jul 15, 2019, 5:15 PM Hal Murray via devel <devel@ntpsec.org> wrote:
> > tenterl...@gmail.com said: > > I come from a scientific background, where we compare results somewhat as > > analog values. If the test result is off the expected by 1000%, that's > bad. > > If it's off 1%, better. If the error is .00001%, probably within > achievable > > accuracy. > > There is a difference between running the same experiment again to get new > data and running new software on old data. > > Are the specs and implementation for IEEE floating point tight enough so > that > I should get the exact same result if I run a test on a different CPU > chip? > Or is there room for things like holding extra bits in temporary results > so > the bottom bits might be different due to round off or such? > Possibly. But I would say have a tight tolerance and a not so tight one. If the absolute difference is less than both paint it green, if only one then yellow, and for neither red. I'm probably wrong though. >
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