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Forum: Run Management
Re: Question Geant eating memory (Christian Doerr)
Date: 10 May, 2002
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

On Fri, 10 May 2002, Christian Doerr wrote:

> *** Discussion title: Run Management
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/runmanage/7"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello everybody,
> 
> I hope this is the right category for my question, but I think
> my problem has to do with it.
> 

Hello Christian,

Memory leak is as rule not easy problem to debug, so I cannot give you
complete answer what to do, but I propose to exclude some moments.

> I'm running a simulation of radioactive decays in an underground
> setup, means I need to simulate a lot of decays for a lot 
> of nuclides, i.e. in the order of 10^8 events per run.
> My problem currently is that my program works fine except for
> the fact that the process is getting bigger and bigger and after
> 8 million or so events all of my 256 MB memory are full and 
> the system crashes.
> 
> In the programm the recording is done by my own Recorder class,
> which writes all results to a ROOT file, so I don't want 
> geant4 to keep any kind of information concerning hits, tracks, 
> steps, etc. in memory after the event is processed and the next
> decay is ready to start. I also observed that after the end of 
> a run the process size doesn't change, also after closing 
> the ROOT output files

G4 does not keep any information unless user application is doing that. If
leak is in G4 it should be fixed.

> 
> How can I find out where geant4 is eating all my memory?
> What kind of information does geant4 keep in memory during a run?
> Is there anything like 
> 
> aRun->RemoveEveryUnnecessaryInformationFromMemory(); ?
> :)
> 
> Thanks a lot for any suggestions.
> Christian
> 
> PS: I'm using Root version 3.01/06 and Geant4 4.0
>     under SuSE Linux 7.3 with gcc version 2.95.3
> 

I would suggest:

1. To use Geant4 4.0.p02 -> 4.0 is not recommnded
2. As a test, remove access to ROOT and reproduce a leak
3. Than additionly remove all user actions and reproduce a leak
4. After that it will be clear that leak is in G4 and you can, for
example, submit a G4 bug report, or post in hypernews two things:
primary generator + physics list.

cheers, VI

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