[Users] GW150914 - error while running simulation

[Erik Schnetter]

Congratulations! These are the two black holes moving counterclockwise in
the x-y plane. If you use an aspect ratio of 1:1, then you'll see that they
haven't actually moved very far yet. You also see that the black holes
start at rest (in terms of coordinate speed) because the gauge conditions
in the initial conditions is suboptimal in puncture initial conditions. If
you zoom in onto one of the black holes you'll see that they don't move in
straight lines, but rather on a circle with a radius of about 6.

You should, of course, be able to run this setup on 128 cores instead of
just 8, where it would run faster. This is likely a problem with either you
*.ini, *.sub, or *.run file. If you tell us more about your cluster (maybe
point to its documentation) and share the respective Simfactory files, then
we might be able to help out. Unfortunately, many HPC systems are designed
to be different in their details from other systems, and thus setting up
correct Simfactory files for a new cluster is difficult. (As you've
noticed.)

-erik


On Sun, Oct 10, 2021 at 3:58 PM Krishiv Bhatia <flyingunicorns5724 at gmail.com>
wrote:

> In Jupyter, it crashed.   But it ran on my mac. I ran it for 6 hrs. Got
> this:
>
> > plot 'puncturetracker-pt_loc..asc' u 23:33 title "BH 1",
> 'puncturetracker-pt_loc..asc' u 24:34 title "BH 2";
>
> [image: image.png]
>
> On Sat, Oct 9, 2021 at 3:46 PM Krishiv Bhatia <
> flyingunicorns5724 at gmail.com> wrote:
>
>> Ah... it is working with procs = 8 instead of 128.
>> 16 * 8 = 128.  Seems to equate to node = 1
>> [image: image.png]
>>
>> On Sat, Oct 9, 2021 at 1:15 PM Krishiv Bhatia <
>> flyingunicorns5724 at gmail.com> wrote:
>>
>>> In the below mail, the first execution is in:
>>>
>>> https://etk.cct.lsu.edu/user/flyingunicorns5724/notebooks/GW150914.ipynb
>>>
>>> while the second execution is in my local mac.
>>>
>>> - Krishiv
>>>
>>> On Sat, Oct 9, 2021 at 1:08 PM Krishiv Bhatia <
>>> flyingunicorns5724 at gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I was running the commands in the following tutorial:
>>>>     http://einsteintoolkit.org/gallery/bbh/cr.html
>>>>
>>>> and got the following error message by running the below command.
>>>>
>>>> Will appreciate your help.
>>>>
>>>> [image: image.png]
>>>>
>>>> $ simfactory/bin/sim create-submit GW150914_28 --define N 28 --parfile
>>>> par/GW150914/GW150914.rpar --procs 128 --walltime 24:00:00
>>>>
>>>>
>>>> Assigned restart id: 0
>>>>
>>>> Error: Too many nodes specified: nodes=16 (maxnodes is 1)
>>>>
>>>> Aborting Simfactory.
>>>>
>>> _______________________________________________
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>


-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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