Thank you very much, Vaclav, for such expanded answer! I decided to use the second way (velocity=0) to escape workarounds.
2010/8/12 Václav Šmilauer <[email protected]> > Hi Anton, > > read https://www.yade-dem.org/sphinx/user.html#checkpoints -- although it > talks about loadTmp, the same applies to O.pause() etc. Calling O.pause() > from inside the engine will (though it might depend on exact timing between > python and computation threads, and that is probably the reason why you > sometimes get the simulation paused and sometimes not) have no effect, > modifying engines from inside the loop might lead (I would guess) to crash > and calling O.run() will have no effect either. > > Right, sometimes I had normal exit with multy-starter, and sometimes crash (very rarely). I think we should have to have for a future a better mechanism for deleting engines. I t can be useful in some cases. > Currently we have no proper method for modifying engines on the fly, from > inside, although I thought a few times about something like O.postIterHook > that could be used to postpone python code execution after the current > iteration (if non-empty); that code could modify O.engines safely. > > Now, you can solve your problem with something like: > > def feedIsFinished(): > if condition: O.stopAtIter=O.iter+1 # stop exactly after this > simulation > > O.run() > O.wait() # will block until the simulation is stopped from inside > feedIsFinished > # modify engines here as you want > O.run() # continue with modified engines sequence > > OR, you can set zero translation for the translation engine; deleting the > bodies is safe without pausing the simulation. > > HTH, v. > > > > I pause simulation for a while, delete some engines, delete some bodies > and > > then start the simulation again. > > In this step simulation sometimes terminates, not always, but it > happens. > > > > What do I do wrong? > >
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