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Re: [ESPResSo-users] Simulation of fluid using LB-method

From: Ulf Schiller
Subject: Re: [ESPResSo-users] Simulation of fluid using LB-method
Date: Mon, 27 Jan 2014 12:16:01 +0100
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On 01/27/2014 11:54 AM, Wink, Markus wrote:
3) Even though, the velocity profile saturates, it takes pretty long
(time scale of days). The saturation sets in at about 350 times the
“integration 1000” command. This corresponds to a time scale of ms in Si
units. Besides using OpenMpi or the GPU impementation, is there anyway
to speeden up the simulation? For example by adjusting the parameter tau
in the lbfluid command?


that sounds a bit strange to me. If your system is 50^3 and you integrate 1000 steps, that gives 125*10^6 site updates. On a reasonably modern CPU, a reasonable LB code should get to around 10M SUPS (million site updates per second), that is, one call of "integrate 1000" should not take much more than 10 seconds, so 350 calls roughly one hour not days. Can you check how many site updates per second you get on your system?


Dr. Ulf D. Schiller                        Building 04.16, Room 3006
Institute of Complex Systems (ICS-2)       Phone:   +49 2461 61-6144
Forschungszentrum Jülich, Germany          Fax:     +49 2461 61-3180

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