Re: galaxy collision demo

From: Douglas/Lesli Summerstay <dsummerstay_at_gmail.com>
Date: Mon, 21 Sep 2009 12:25:37 -0400

We are developing a method for automatically selecting key-frames in data
that contain the most information about how the evolution of particle data
is happening, that best describe the animation (I am at the University of
Maryland, working with Amitabh Varshney). To do this, I need scientifically
interesting particle data in four dimensions. We thought this data would be
just what we needed (especially since there are already "keyframes" evenly
spaced in time that others have published on the web to compare it to), but
so far I haven't been successful in generating it. I can write a program in
C++ or Matlab to read the snapshot files, since they're described pretty
well in the documentation.
I would be very grateful if you could find a way to send me those snapshots.

Douglas

On Mon, Sep 21, 2009 at 11:26 AM, Jay Billings <jayjaybillings_at_gmail.com>wrote:

> Douglas,
>
> I had compiled FFTW wrong in my case, but I don't know if this is the
> problem with yours. You could probably track your problem down quickly with
> a debugger or some print statements.
>
> I could supply you with some snapshots, but I have to ask why need it?
> Also, do you have the capability to read to read the snapshots? I don't mean
> for the first question to sound offensive; I just need to be sure that you
> don't need it for a homework problem or something.
>
> Jay
>
>
> On Mon, Sep 21, 2009 at 11:06 AM, Douglas/Lesli Summerstay <
> dsummerstay_at_gmail.com> wrote:
>
>> Jay,
>> I imagine it may be, as you say, some kind of compilation error on my
>> part. It is running, using up CPU, but not generating even the first
>> snapshot in galaxy/ . Any idea the nature of the error you had? Or
>> suggestions on how to track it down? Unfortunately I need the 3D position
>> data, not just the video.
>> Thanks again.
>>
>> Douglas
>>
>>
>> On Mon, Sep 21, 2009 at 10:51 AM, Jay Billings <jayjaybillings_at_gmail.com>wrote:
>>
>>> Douglas,
>>>
>>> You are correct that you should see a snapshot at t=0 for the test
>>> problem. Did you look in the galaxy/ directory? The snapshots are stored
>>> there.
>>>
>>> The test problem with default settings only outputs six or seven snapshot
>>> files from t=0 to t=3.0. I'm a bit concerned that it has taken "days"
>>> without creating any snapshot files; that test problem runs in 15 minutes on
>>> my quad core machine and in about an hour on my old P4. When I first started
>>> working with Gadget2 I encountered a similar problem to yours and it turned
>>> out to be a compile error.
>>>
>>> If you are only interested in videos, you might check out my youtube
>>> page: http://www.youtube.com/jayjaybillings . These are videos of a
>>> different simulation.
>>>
>>> Jay
>>>
>>> On Mon, Sep 21, 2009 at 10:39 AM, Douglas/Lesli Summerstay <
>>> dsummerstay_at_gmail.com> wrote:
>>>
>>>> I am trying to run the galaxy collision sample and had a few questions:I
>>>> am trying to run it on a single processor. How long should I expect to
>>>> wait before seeing any output snapshot files? (I am using the default
>>>> parameter file.) I left it running for days without seeing any snapshot
>>>> files created. This seems odd because the first snapshot is supposed to be
>>>> created at time 0. Any idea why no snapshot files are being
>>>> created? Alternately, could anyone run this simulation and make the snapshot
>>>> files available to me?
>>>> Are the pictures of colliding galaxies on the Gadget site (
>>>> http://www.mpa-garching.mpg.de/gadget/collision/index.html ) from this
>>>> simulation?
>>>>
>>>> Thanks for your help.
>>>>
>>>> --
>>>> http://dsummerstay.googlepages.com
>>>>
>>>>
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>>>>
>>>>
>>>
>>>
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>>
>>
>> --
>> http://dsummerstay.googlepages.com
>>
>>
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>>
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>>
>
>
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-- 
http://dsummerstay.googlepages.com
Received on 2009-09-21 18:25:58

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