[petsc-dev] Error running on Titan with GPUs & GNU

[Mark Adams]

>
>
>
>     Are there newer versions of the Gnu compiler for this system?


Yes:

--------------------------------------------------------------------------------------------------
/opt/modulefiles
--------------------------------------------------------------------------------------------------
gcc/4.8.1          gcc/4.8.2          gcc/4.9.3          gcc/5.3.0
gcc/6.1.0          gcc/6.2.0          gcc/6.3.0(default) gcc/7.1.0
gcc/7.2.0          gcc/7.3.0



> Are there any other compilers on the system that would likely be less
> buggy? IBM compilers? If this simple code generates a gross error with
> optimization who's to say how many more subtle bugs may be induced in the
> library by the buggy optimizer (there may be none but IMHO probability says
> there will be others).
>

Let me ask them what they recommend to use with cuda codes.


>
>     Is there any chance that valgrind runs on this machine; you could run
> the optimized version through it and see what it says.
>
>
Valgrind works but tons of output and I could not see anything interesting
in there.

And, this test does work with 1 processor!

I think this is only a problem when GMRES is uses as the eigen estimator in
Cheby. GMRES solvers work and Cheby works with -mg_levels_esteig_ksp_type
cg.
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