[mesa-users] variability in runs

[Bill Paxton]

On Apr 23, 2012, at 12:11 PM, andres suarez wrote:

> I am running mesa version 3851 on a linux platform on an x86_64 multi-processor computer, using ifort.
> 

Hi Andres,

I've worked on your problem some -- no solution as yet, but a couple of options to get around it.

I don't see the variability with gfortran, so the easiest work-around is to switch to it (consider using the mesa SDK).

If you are a die-hard ifort fan, you can avoid the bug by using the slower banded lapack option for doing the linear algebra in star instead of the default faster option that uses multicore parallelism.    To do this, add these to &controls in your inlist:

         small_mtx_decsol = 'lapack'
         large_mtx_decsol = 'lapack'

We'll of course let you know if we can find a better solution.  Hopefully it is a bug in my code rather than a compiler bug in ifort, but so far I haven't been able to find it.  Help in debugging is welcome!!!!

-Bill