yade-users team mailing list archive

[kan <nicessgg@xxxxxxxxx>]

On 2/26/08, yade-users-request@xxxxxxxxxxxxxxxx <
yade-users-request@xxxxxxxxxxxxxxxx> wrote:
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> Today's Topics:
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>   1. Re: Simulation with 100,000 sphere (Bruno Chareyre)
>   2. Re: Simulation with 100,000 sphere (Janek Kozicki)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Mon, 25 Feb 2008 19:33:09 +0100
> From: Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>
> Subject: Re: [Yade-users] Simulation with 100,000 sphere
> To: yade-users@xxxxxxxxxxxxxxxx
> Message-ID: <47C309E5.2040201@xxxxxxxxxxx>
> Content-Type: text/plain; charset=windows-1252; format=flowed
>
> Kan, could you install callgring /vallgrind/kcachegrind and run this
> command :
>
> valgrind --tool=callgrind ./yade-svn1258 -n -- -f
> /home/bruno/YADE/data/scene.xml -v 1000 -p -m 2
>
> with scene.xml = your 100k spheres simulation. It will make only two
> iterations then stop, and you will get a nice file in /bin that you can
> open with kcachegrind. It will show which function takes all this time.
>
> And yes, I suspect physicalActionContainer too.
>
> Bruno
>
> p.s. saving/loading in binary format would be faster probably.


Thanks, Bruno,

I am sorry for the later reply.
I have to write my own code for my project, that is why I always asked you
nice guys some details in DEM or YADE.
Of course I also read the code of YADE, but it is a big project with many a
good design, but it is complex for me, that
is to say some times I can not understand, :(.


Thank you guys again.

Kan.

V?clav ?milauer a ?crit :
> >> I also need to do large scale simulation which may need to do around
> >> 500,000 for field engineering case. but instead of using YADE I have
> >> to develop my own code to do this, :(.
> >> In my opinion, the CPU computing time is the most important issue in
> >> DEM, while the memory is determined by the total particle number, and
> >> you data-structure design, 2GB can do a lot for a 2D case, for 3D case
> >> you may need more memory. but the momory requirements will not change
> >> much when your total particle number is defined.
> >>
> > Since Bruno just began hunting bottlenecks, Yade could be useful even
> > for 5e5 - in the current state, one iteration would take about 5 seconds
> > (by extrapolation).
> >
> >>
> >> hi, Vaclav,
> >> is it possible that the 5 mins used for packing or sample preparation
> >> to fill the container? I just guess, for my case, it takes some time
> >> for this step and then enter the cycling.
> >>
> > No, I was loading that file from .xml and it took that time after
> > starting the simulation that had been already loaded. I think Janek
> > (ping Janek ;-) ) could comment on this, the PhysicalAction containers
> > can take a lot of time to initialize.
> >
> > Vaclav
> >
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>
> --
>
> _______________
> Chareyre Bruno
> Maitre de conference
>
> Institut National Polytechnique de Grenoble
> Laboratoire 3S (Soils Solids Structures) - bureau E145
> BP 53 - 38041, Grenoble cedex 9 - France
> T?l : 33 4 56 52 86 21
> Fax : 33 4 76 82 70 43
> ________________
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 25 Feb 2008 20:43:19 +0100
> From: Janek Kozicki <janek_listy@xxxxx>
> Subject: Re: [Yade-users] Simulation with 100,000 sphere
> To: yade-users@xxxxxxxxxxxxxxxx
> Message-ID: <20080225204319.2cff2beb@absurd>
> Content-Type: text/plain; charset=ISO-8859-2
>
> V?clav ?milauer said:     (by the date of Mon, 25 Feb 2008 10:30:00 +0100)
>
> > No, I was loading that file from .xml and it took that time after
> > starting the simulation that had been already loaded. I think Janek
> > (ping Janek ;-) ) could comment on this, the PhysicalAction containers
> > can take a lot of time to initialize.
>
> well, loading xml is slow (binary is faster). Filling PhysicalAction
> can be slow too - but currently it's Bruno who currently knows the
> best. He is now doing some heavy profiling, I must read carefully his
> results.
>
> --
> Janek Kozicki                                                         |
>
>
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> End of Yade-users Digest, Vol 20, Issue 16
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