[Gate-users] Geant4 10.0 MT and GATE

[David Sarrut]

Hello,

the develop branch of the opengate git repository has been updated : Gate
is now compatible with Geant4 10.0 (must be compiled with GEANT4_BUILD_
MULTITHREADED=false).

feedback welcome,
have fun,
David



On Mon, Dec 2, 2013 at 2:37 PM, Marc Verderi <verderi at in2p3.fr> wrote:

> Dear Ian,
>
>     Just a few words to let you know about some feature of the Geant4 10.0
> MT, and to partly answer your question. Geant4 10.0, which includes this MT
> capability, will be released in a few days. The MT scheme adopted is to
> process events (in Geant4 sense) in parallel, each thread dealing with a
> set of events, and sharing geometry and physics tables among the threads,
> to minimize the memory footprint.
>
>     GATE will certainly need an adaptation. This is of course critical,
> but requires only a few lines of code. The G4RunManager as to be replaced
> by the G4MTRunManager. Users' actions (primary generator action, stepping
> action, event action, and run action if needed) become thread local actions
> : one instance of each of these actions is instantiated per thread.
> Sensitive detectors and fields become also thread local, and have to be
> instantiated in a new method of the detector construction :
> ConstructSDandField() which is executed once for each thread. In this way,
> events can be processed independently, in parallel. The overall mechanics
> is controlled by a master thread, the one launched at the application
> startup, and which then spawn the slave threads at event loop start.
>
>     What will be needed also is an examination of the "static" data
> members in the GATE classes : some of them would be static as known in the
> master and slave threads, some others will be static but with a thread
> local scope and will need some adaptation. Helper classes in the Geant4 MT
> version exist to help doing an easy transformation of, for example, a
> singleton to a thread-local singleton.
>     All these transformations are compatible with a sequential processing
> (the up-to-now processing), and a MT-compliant code can be compiled as is
> for a sequential processing (provided the G4RunManager has been chosen).
>
>     For information, tests performed on a 61 cores Intel Xeon Phi board
> allowed to go up to 244 threads (maximum possible number on this platform)
> for a single realistic application !
>
>     Hoping I just whet your appetite ! ;)
>
> Best regards,
> Marc
>
>
>
>
> On 11/26/2013 03:07 PM, Porter Ian (RBV) NHS Christie Tr wrote:
>
>> Hello All,
>>    My understanding is that the next version of Geant4 (v10.0) will
>> support multi-threading and will be released to production soon.  We are
>> keen to move over to this to avoid using multiple instances of GATE (1
>> per CPU core) on our cluster.  Can anyone tell me whether GATE will
>> require an upgrade in order to work with Geant4 MT?  If so, is there a
>> timescale for the release of the new version?  The last newsletter
>> mentions GATE v7.0 with GPU support, which was due out by now but has
>> not yet appeared.  Is this being rewritten with a view to supporting
>> Geant4 10.0 MT?
>>
>> Many Thanks,
>>    -- Ian.
>> To download our 20:20 Vision strategy, please visit
>> http://www.christie.nhs.uk/2020
>>
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-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
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