Alternate implementation of Intel PRK DGEMM

[rahulghangas]

An alternate implementation of Intel PRK DGEMM

• Add perf Testing
• Add compopts for native and BLAS

NOTE - Currently does not perform pipelined communication, which is inherent to SUMMA

[rahulghangas]

@e-kayrakli

[e-kayrakli]

I have some in-detail comments in-line. Couple of higher-level comments:

• I think this shouldn't create a new dir under test/studies/prk. You can create a dir under test/studies/prk/DGEMM named distributed, summa etc. Or you can also dump these files with some suffix in test/studies/prk
• We discussed with @ben-albrecht that we want to have this to be a part of nightly performance tracking suite. For example see XC suite here. Also see multilocale performance testing doc. But doing that can be a follow up. The sooner we begin measuring the performance, the better. You can track the impact of your future optimizations there.

[rahulghangas]

@e-kayrakli I think it's ready for a review
@dgarvit @LouisJenkinsCS @ben-albrecht

[e-kayrakli]

I think this looks good. I asked few things that need to be adjusted for better testing runs.

Moreover, it is important to talk about the deviation from SUMMA in a comment somewhere.

I tested this on our correctness testing machine and 16-locale XC performance testing machine. @ben-albrecht could you also do a quick sanity check especially w.r.t the multilocale testing files and BLAS testing? ML tests are running only on Crays, so we don't need a skipif I think. But I have been wrong in similar topics before...

[rahulghangas]

If someone can do a sanity check on the testing, I think this PR can be merged now