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

[Amedeo Romagnolo]

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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