[mcstas-users] Source Parallelization

[Peter Kjær Willendrup]

Dear Federico,


If I remember correctly, until after the scope of INITIALIZE, mcget_ncount() will return the total number of neutron histories.

So what we typically do in INITIALIZE is to assign some normalisation constants, including 1.0/mcget_ncount(). For an example, look at the ESS_butterfly.comp.

Alternatively, you may also simply

#ifdef USE_MPI
      /* We always repeat by the number of nodes in an MPI run */
      p /= mpi_node_count;
#endif

- example taken from Virtual_input.comp.


Best and hope this helps,

Peter


Peter Kjær Willendrup
Senior Research Engineer, Special Advisor

DTU Physics

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Technical University of Denmark



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Department of Physics
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DK-2800 Kongens Lyngby

Direct +45 2125 4612

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pkwi at fysik.dtu.dk<mailto:pkwi at fysik.dtu.dk>

On 10 Apr 2017, at 15:54 , Federico M. Bertalot <federicobertalot at cnea.gov.ar<mailto:federicobertalot at cnea.gov.ar>> wrote:

Hello,

i have written my own source component, and in order to normalize the results i defined the weight of each neutron as:

p=1.0/mcget_ncount()

it works fine for one processor, but for more processors mcget_ncount() seems to return the number of neutron histories running on each processor, instead of the total number of neutron histories. Then, the normalization of the results changes with the number of processors. Which is the best solution to this problem?


Thank you very much,

Federico.

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