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Simple Benchmark for Matrix Initialization                              [TOC]
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For the benchmark we will use function `walltime` as a black box.  As the
function name suggest it simple returns the wall time.

Exercise
========
- Make yourself familiar with the following benchmark test:

  - In function `main` we allocate memory for different matrix dimensions.
  - For each matrix we measure the wall time needed to initialize the matrix.
  - We compare the times for matrices that are either store row major or col
    major

- Compile and run the benchmark.  Use different optimization flags:

  - No optimization
  - `-O1`, `-O2`, `-O3` and `-Ofast`

:import: session10/bench_init.c

Exercise
========
- Modify the algorithm for `initGeMatrix` as follows:

  ---- CODE(type=txt) ----------------------------------------------------------
  if A is store row major then
     initialize matrix A row wise
  else
     initialize matrix A column wise
  ------------------------------------------------------------------------------

- Re-run the benchmark with the different optimization flags.