Re: galaxy collision demo

From: Jay Billings <jayjaybillings_at_gmail.com>
Date: Tue, 22 Sep 2009 09:32:00 -0400

Douglas,

I've produced the snapshots, but unfortunately they are about 1.5 GB in
size.

Do you have a public file share to which I could upload them?

Jay

On Mon, Sep 21, 2009 at 12:43 PM, Jay Billings <jayjaybillings_at_gmail.com>wrote:

> No problem. 1000 it is.
>
> Jay
>
>
> On Mon, Sep 21, 2009 at 12:35 PM, Douglas/Lesli Summerstay <
> dsummerstay_at_gmail.com> wrote:
>
>> 1000 would be best, but whatever you can do. Thanks so much for your
>> help!
>> Douglas
>>
>>
>> On Mon, Sep 21, 2009 at 12:30 PM, Jay Billings <jayjaybillings_at_gmail.com>wrote:
>>
>>> Okay, no problem! I'll try to get something put together for you. How
>>> many snapshots would you like? 10, 100, 1000?
>>>
>>> I can also direct you to some source for reading and writing the files or
>>> point you to recent discussions on the list.
>>>
>>> Jay
>>>
>>>
>>> On Mon, Sep 21, 2009 at 12:25 PM, Douglas/Lesli Summerstay <
>>> dsummerstay_at_gmail.com> wrote:
>>>
>>>> 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
>>>>>>>>
>>>>>>>>
>>>>>>>> -----------------------------------------------------------
>>>>>>>>
>>>>>>>> If you wish to unsubscribe from this mailing, send mail to
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>>>>>>>> gadget-list
>>>>>>>> A web-archive of this mailing list is available here:
>>>>>>>> http://www.mpa-garching.mpg.de/gadget/gadget-list
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> -----------------------------------------------------------
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> http://dsummerstay.googlepages.com
>>>>>>
>>>>>>
>>>>>> -----------------------------------------------------------
>>>>>>
>>>>>> If you wish to unsubscribe from this mailing, send mail to
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>>>>>> A web-archive of this mailing list is available here:
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> -----------------------------------------------------------
>>>>>
>>>>> If you wish to unsubscribe from this mailing, send mail to
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>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> http://dsummerstay.googlepages.com
>>>>
>>>>
>>>> -----------------------------------------------------------
>>>>
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>>>
>>>
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>>>
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>>
>>
>> --
>> http://dsummerstay.googlepages.com
>>
>>
>> -----------------------------------------------------------
>>
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>>
>
Received on 2009-09-22 15:32:01

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