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

[Amedeo Romagnolo]

Hi Rob,

so, it starts getting slower about 2061763.808 s at model_number 3400.
Log(dt) is ~ 1.49, which is no sudden change from the previous 1.48 .

Amedeo

On Tue, 4 May 2021 at 11:26, Rob Farmer <robert.j.farmer37 at gmail.com> wrote:

> 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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