[mesa-users] Results changing while rerunning the same problem

[trobolo dinni]

Hi Bill,

yes, I saved the logs for the last one and I will compare them with those
of the simulation that is running now!
After this I will try the 1 processor runs, btw the cpu is an i7
(4real+4virtual cores) and I am running on all of them atm.

Thanks,
                 Roberto


2013/1/16 Bill Paxton <paxton at kitp.ucsb.edu>

> Hi,
>
> Please DO NOT run another 12000 step run before checking to see if the
> results are changing.
> Start over with 2 runs in separate directories and run each for minimal
> number of steps to show a difference.
>
> -B
>
>
>
>
> On Jan 15, 2013, at 4:36 PM, trobolo dinni wrote:
>
> Hi Bill,
>
> Exactly, I did two runs with exactly the same inlist: after I finished the
> first simulation I checked the results, then I ./rn in the same directory
> without touching anything.
>
> I didn't check at what model number the simulations begin to differ, but
> for sure in the first one the "power_he_burn_upper_limit" reaches 1d4 at
> model number 15295, while in the second at model number 12835, and at that
> time all the physical variables of the two stars are different.
> Unfortunately since I did the simulation in the same directory of the
> previous I have lost the logfiles of the first one and I can't go back to
> check. Anyway I am now running a third one.
>
> After this third try I am going to change to OMP_NUM_THREADS 1.
>
> I hope I have been clearer, sorry and thanks,
>                                                                    Roberto
>
>
>
> 2013/1/16 Bill Paxton <paxton at kitp.ucsb.edu>
>
>> Hi,
>>
>> I still don't understand.   You do two runs with the same inlist.  At
>> what model number do the results first differ?  model 1?  model 10000?
>>
>> Can you repeat this?  Or does it happen randomly?
>>
>> Does it still happen when you set OMP_NUM_THREADS 1
>>
>> -B
>>
>>
>>
>> On Jan 15, 2013, at 4:03 PM, trobolo dinni wrote:
>>
>> Hi Bill,
>>
>> I attached the namelist I am using, I have not starting models since I
>> rerun the same simulation from the beginning.
>>
>> Starting from the model number reached at the end of the simulation
>> (15295 the first time and 12835 the second), every physical variable of the
>> star I was simulating was different.
>> I am stopping the simulations at the He flash, using the criterion
>> suggested me by Aaron Dotter in a previous discussion, which consists in
>> setting up the "power_he_burn_upper_limit" control to 1d4 or so. Hence is
>> like the star reaches the He flash at different moments in different
>> simulations.
>>
>> I am using mesasdk to compile mesa, it uses gfortran 4.7.2; I am running
>> the code in 64 bit linux (Ubuntu 12.04.1 LTS) box; the mesa version is the
>> 4740.
>>
>> Sorry for the lack of information in my first email!
>> Thanks for the help,
>>                                 Roberto
>>
>>
>> 2013/1/16 Bill Paxton <paxton at kitp.ucsb.edu>
>>
>>> Hi,
>>>
>>> Please provide the necessary info for us to try to reproduce the problem.
>>> That means inlists and starting model if any.
>>> And exact details about what you notice as different.
>>> Also, what compiler and what system and what version of mesa.
>>>
>>> -B
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Jan 15, 2013, at 3:36 PM, trobolo dinni wrote:
>>>
>>> > Dear MESA users,
>>> >
>>> > I have got a simple weird problem: I run the same simulation twice,
>>> and I am getting two different results.
>>> >
>>> > I know it does not depends on the code, but I would like to ask if
>>> anyone noticed the same behavior and if it can depend on my computer or if
>>> I have to do something particular before running again the same simulation
>>> in the same directory.
>>> >
>>> >
>>> > Thanks,
>>> >                 Roberto
>>> >
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>>>
>> <inlist.1M-preMS_RGBtip-sb_rot_0.3_from_ZAMS>
>>
>>
>>
>
>
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