|Message: Re: record/visualize specific events after a huge sim||Not Logged In (login)|
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On Thu, 28 Sep 2017 17:37:21 GMT, Yen-Yung Chang wrote:
> I would like to visualize a few specific events from a huge simulation. > I record the "i-th" indices of these events and use the same random seed > every time, so I imagine in principle I should be able to start the GUI > and visualize these rare events by asking it to run only the i-th events > after the first one? But I couldn't find an efficient way to do > this...please help! Thank you very much!
The event index is insufficient for this, since the random engine state is determined by the full sequence of all the random numbers thrown _during_ each event.
Geant4 provides a way to write out the random engine state at the start of each event (see /random/saveEachEventFlag), and you can then reproduce that event by reading back the state faile (see /random/resetEngineFrom).
Tom Roberts' suggestion of setting the seed on each event in a deterministic way, will also solve your problem for a single job, but it doesn't work for the general case of large-scale production.
-- Michael Kelsey