[Mesa-users] Technical issue: calculations going incredibly slow

[Rob Farmer]

Hi,
Okay can you add elapsed_time to your history columns file, this will track
the amount of time since the run started (so we can hopefully see when it
starts getting slow and by how much).

Also when you start a ./rn what timestep does it get to when it slows down?

Rob


On Tue, 4 May 2021 at 11:16, Amedeo Romagnolo <amedeoromagnolo at gmail.com>
wrote:

> Hi,
>
> it doesn't have a fixed time when it slows down per se. It is just after
> the first ~10 minutes I initialize the code, be it with ./mk + ./rn or with
> ./re . It is regardless of when the star does, be it at pre-MS, MS, or post
> MS.
> The cpu/ram usage is the following (star is the MESA run):
>
> [image: image.png]
>
> And for the record my CPU is anything but poorly performing. Do you think
> I should try reducing the cores or something?
>
>
>
> On Tue, 4 May 2021 at 11:06, Rob Farmer <robert.j.farmer37 at gmail.com>
> wrote:
>
>> Hi,
>>
>> Can you provide more details? What's the star doing when it starts to
>> slow down? How far in the evolution do you get in the 10 minutes? I ran
>> your model for ~3500 steps (and also did a ./re) and didn't notice it
>> getting slower. How many mesh points/isotopes does your model have when it
>> starts getting slower? Did they increase when it did?
>>
>> If you run top in another terminal while the run is going, how much
>> ram/cpu are you using (as a percentage of your system)?
>>
>> Rob
>>
>>
>> On Tue, 4 May 2021 at 10:23, Amedeo Romagnolo via Mesa-users <
>> mesa-users at lists.mesastar.org> wrote:
>>
>>> Hi all,
>>>
>>> here is my problem. I have set a pretty vanilla simulation on MESA
>>> (inlists attached), but because of some weird black magic my calculations
>>> go fast enough over the first ten minutes, and then they dramatically slow
>>> down. And I'm not talking about timesteps, but about the actual calculation
>>> time for each timestep.
>>>
>>> Even more weirdly, if I reset my PC and restart the simulations (./re)
>>> the code goes fast for another ~10 minutes and then slows again.
>>>
>>> I'm using Ubuntu 20.04, and I made sure no other process was running at
>>> the same time. And yes: I set the right number of cores.
>>>
>>> Did this happen to anyone else? Do you have any idea on how to solve
>>> this?
>>>
>>> Cheers,
>>>
>>> Amedeo
>>> _______________________________________________
>>> mesa-users at lists.mesastar.org
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>
>>>
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