Re: “Tuning packages for a CPU micro-architecture”

[zimoun]

Hi Ludo,

Thanks for this nice blog post!

On Thu, 06 Jan 2022 at 17:22, Ludovic Courtès <ludovic.courtes@inria.fr> wrote:

> I’ve found reproducibility to be often depicted as being detrimental to
> performance in HPC circles, so this is a contribution to suggest
> otherwise.

Who knows if an “HPC fool” would not write a ’package-with-tune’
rewriting the ’tune’ properties to all the packages and then run a
world-rebuild. ;-)

Well, the conscious choice of letting ’--tune’ operates only on packages
explicitly marked as “tunable” appears to me a clean design.  It makes a
an explicit and clear separation between “portable-optimized” packages
(almost all) vs “micro-optimized” packages.  The best of both worlds: as
much as possible reproducible, sacrificing for few corner-cases, keeping
the performance for all.


Cheers,
simon