[mesa-users] inconsistency

[Martin C.]

Hi all

I think I've come across something in MESA that may contradict this from
MESA paper 3:

>From MESA paper 3

[image: Inline image 1]
[image: Inline image 2]

MESA is supposed to provide bit for bit consistency across all platforms,
independent of threads. (for those not able to see the inline screenshots).

I'm using other_D_mix in run_star_extras to calculate a diffusion
coefficient. For that I need to access values from s% omega.
It seems that when I change OMP_NUM_THREADS from 3 to 2 the values in s%
omega are different. I test this with this routine (also in attached
run_star_extras)

[image: Inline image 3]

I tested the above on ubuntu14, *mesa 8118*, latest sdk.
example: OMP_NUM_THREADS =2
[image: Inline image 4]

OMP_NUM_THREADS = 3 produces:

[image: Inline image 5]


I also installed mesa 8118 on a mac pro with latest sdk (default of 16
threads). Here no matter what I change OMP_NUM_THREADS to I don't get the
results that I get on ubuntu. Worse: running the exact same code multiple
times yields different results for the printed s% omega values! (Often
zeros, sometimes NaN, sometimes "random" values).


So am I misunderstanding something? What's causing this. How can I work
around this problem (if it is one).

thanks!

Martin








-- 
Martin C.
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