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Forum: User Requirements
Re: Question Parallelism in G4 on video-cards (Dmitry Naumov)
Date: 18 Sep, 2009
From: Paul Nicholas Colin Gloster <Paul Nicholas Colin Gloster>

On September 17th, 2009, Dmitry Naumov submitted:

|-----------------------------------------------------------------------|
|"Dear G4 developers and users. I would like to learn from you if anyone|
|tried to run g4 simulations in parallel jobs using processors of       |
|video-cards? The point is that such kind of unusual use of video-cards |
|becomes very powerfull in recent years and people get factors          |
|tens-hundreds of performance increase using this approach (see         |
|http://www.nvidia.com/object/cuda_home.html# )                         |
|                                                                       |
|I would like to know first of all from the developers if G4 design     |
|allows such a splitting, and which parts of g4 could be used for       |
|parallel jobs and where it is better not to spend time on this kind of |
|developments.                                                          |
|                                                                       |
|Some of my colleagues are involved in doing physics simulation using   |
|nvidia cards parallelism and they volunteer to work in this direction  |
|for g4 if this was not done already, and if g4 design is suitable for  |
|this. Thank you, Dmitry"                                               |
|-----------------------------------------------------------------------|

Dear Dmitry Naumov,

I am not aware of an attempt to utilize G.P.U.s with Geant. Your
colleagues would be welcome to try.

I appreciate the motivation for requesting information regarding which
parts of Geant to consider for parallelism and which parts to dismiss,
but given the misinformation re the architecture of Geant4 in
publications, it would be beneficial for your colleagues to analyze
the codebase for themselves.

I wish this project success.

Yours sincerely,
Colin Paul Gloster

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1 None: Re: Parallelism in G4 on video-cards   (Joseph Perl - 18 Sep, 2009)
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