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Hi Uli,<br class="">
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<div>As you have probably figured out yourself, our MPI-approach is quite naive in the sense that:</div>
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<div>1) The “mother” process collects / decides the “full” ncount of the problem to be simulated (e.g. Nfull)</div>
<div>2) On the k used mpi processors, the partition Nfull / k is simulated</div>
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<div>If I understand you correctly, you are asking if one could redefine the ncount in INITIALIZE?</div>
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<div>- I guess this should in fact be possible, provided that the same Nfull is simulated over the k processors.</div>
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<div>You will of course have to do some logic in the INITIALIZE section to up / downscale the node-dependent ncount as you propose, figuring out how many processors that are of each type and assigning the correct, scaled number locally.</div>
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<div>Best</div>
<div>Peter</div>
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<div class="">On 4 Jan 2021, at 14.48, Wildgruber, Christoph U. <<a href="mailto:wildgrubercu@ornl.gov" class="">wildgrubercu@ornl.gov</a>> wrote:</div>
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<div class="">Hi,<br class="">
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I have a quick question which I am not sure I found the correct answer for in the docs…<br class="">
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If I use 'mcset_ncount(nnn)’ in the mcstas instrument definition with the intent to improve<br class="">
load balancing on a heterogeneous cluster will the run result reflect the newly set number of<br class="">
source neutrons (nnn)?<br class="">
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Thanks,<br class="">
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Uli<br class="">
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Peter Kjær Willendrup<br class="">
Forskningsingeniør, Specialkonsulent<br class="">
Næstformand for DTU Fysik LSU<br class="">
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DTU Physics<br class="">
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