#10: Add more benchmarks

[cwschilly]

Fixes #10
Fixes #12 (wip)

Adds both double and Kokkos::complex<double> benchmarks for:

• Level 1, 2, and 3 BLAS kernels
• DPOTRF

Driver Changes

Instead of passing the dimensions of the matrices used for the benchmarks, just specify the number of floating point operations that each benchmark should perform:

./slownode <iters> <flops>

Each benchmark will then determine the matrix/vector dimensions so that the operation approximates this number of fp ops.

Detection Script Changes

When running the detection script, specify which benchmark you want to analyze with the following options:

-b (--benchmark): [level1, level2, level3, dpotrf]
-d (--datatype):  [double, complex]

If these flags are not set, the script defaults to level3 and double.

[nlslatt]

The final value on some gather lines seems highly suspicious.

gather: 95 (nodename): 1.25574: breakdown: 0.125147 0.132657 0.125616 0.131049 0.124445 0.124678 0.125 0.124691 0.126191 0.116261 3.16202e-322 

gather: 91 (nodename): 2.6874e-05: breakdown: 2.507e-06 2.253e-06 2.24e-06 2.489e-06 2.552e-06 2.523e-06 4.249e-06 2.522e-06 2.689e-06 2.85e-06 1.83819

[nlslatt]

We also need to be able to specify the $N$ for different BLAS levels independently. I have 83 seconds for level 3 complex and 1e-5 for level 1 double.

[cwschilly]

Thanks @nlslatt these issues should be fixed now

[cwschilly]

Converting to draft while I work on #12