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[ESPResSo-devel] [bug #44133] Temperature in LB_GPU is too high

From: Axel Arnold
Subject: [ESPResSo-devel] [bug #44133] Temperature in LB_GPU is too high
Date: Tue, 03 Feb 2015 15:25:11 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/600.3.18 (KHTML, like Gecko) Version/8.0.3 Safari/600.3.18

Follow-up Comment #7, bug #44133 (project espressomd):

I don't think "the shift doesn't matter". If the shift is not a multiple of
the box length, then the neighbor topology of the nodes is different, and very
quickly different parts of the random sequence interact, which should lead to
additional decorrelation.

Otherwise, we would have a fundamental problem, since we use a 48-bit RNG.
That takes just a couple of time steps to repeat, even for a classical MD with
10000 thousands of particles, and for LB it is much less.


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