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[Anton Gladky <question186108@xxxxxxxxxxxxxxxxxxxxx>]

Question #186108 on Yade changed:
https://answers.launchpad.net/yade/+question/186108

Anton Gladky proposed the following answer:
Hi Eugen,

Yade works definitely better on many-core systems. But it will not work
on "real" cluster (where nodes are connected through the network), in this
case you should have a look at LIGGGHTS or ESyS-Particle, which are
MPI-oriented by design.

Moreover, I think Yade should scale better on many-core systems, than
MPI-based code. Because MPI-programs usually divide the simulation
"scene" on equal parts, and each part is calculated by the same node.
Some of such parts can be completely empty, some of them can be
overfulled, so there always happens "dis-balance". Yade divides all active
interactions relatively equally between cores.

Back to hardware, it depends on how many particles you want to simulate,
how many of them will be in contact (dense or sparse packing), type of
the simulation (dynamic or quasi-static) and how much money you have.

The speed of calculation is highly depends on CPU-frequency and
RAM-frequency. More particles and contacts lead to higher RAM-usage.

Cheers,

Anton


2012/10/26 Eugen Kubowsky <question186108@xxxxxxxxxxxxxxxxxxxxx>:
> Question #186108 on Yade changed:
> https://answers.launchpad.net/yade/+question/186108
>
> Eugen Kubowsky requested more information:
> Hi Yade community (btw. you're doing an excellent job in developing this
> amazing DEM engine!)
>
> Hi Liqing,
> have you finally updated your Yade version and compared performance in simulation? Was CPU usage significantly better when using a 32 core system (a workstation i guess?) instead of a 4 core desktop pc?
> it may be of help if you post your system specification.
> At the moment I'm thinking about ways of fastening Yade simulations. the most obvious to me would be a better computer. so instead of a standard desktop with i5 processor a workstation with 32 maybe even 64 cores and a lot of Ram (128 or 256GB).
> But if I get your problem right, that wouldn't really change anything... On the other hand the last post is some months ago.
>
> Looking forward to all your answers,
> Eugen
>
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