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Re: [Bug 1814052] Re: Unreproductible simulation (one core, one computer, one script) with a tutorial example


> Luc Sibille (luc-sibille) by one core I mean Yade is not running in
> parallel, so differences due to rounding in calculation should not
> exist, do they ?
Actually I cannot answer, I do not know sufficiently computers and Yade 
(not sure for instance there are not any part of the computation in 
parallel, even if Yade is launched on a singe core ...). But this point 
has been raised several times. So I guess that if your issue is related 
to this point (and it is possible as your results are not fundammentally 
different) some persons reading this mail will be able to answer it.

Luc Sibille
Université Grenoble Alpes / IUT1 de Grenoble
Laboratoire 3SR: Sols, Solides, Structures, Risques

Tel lab.: +33 (0)4 76 82 63 48
Tel IUT: +33 (0)4 76 82 53 36

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  Unreproductible simulation (one core, one computer, one script) with a
  tutorial example

Status in Yade:

Bug description:
  In the framework of my PhD thesis, I use Yade and shear numerical simulations. 
  While using a script based on the periodic simple shear tutorial example given on the web side, I noticed that my simulation is not reproducible : the physical time, the controlling and the output parameters differ when a sequential yade calculation is run several times on the same core, same computer, same day, same script, same sample.
  I supposed there is/are several parameter(s) which is/are not initialized when closing/opening Yade. Do you know them ?

  I use Yade program on a Ubuntu 18.

  Thanks in advance

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