message: Add some documentation on overhead benchmarking.
diff: @@ -72,6 +72,10 @@ DEFINE_uint32(
  nrhs, 1,
  "The number of right hand sides. Record the residual only when nrhs == 1.");
  +// This allows to benchmark the overhead of a solver by using the following
  +// data: A=[1.0], x=[0.0], b=[nan]. This data can be used to benchmark normal
  +// solvers or using the argument --solvers=overhead, a minimal solver will be
  +// launched which contains only a few kernel calls.
  DEFINE_bool(overhead, false,
  "If set, uses dummy data to benchmark Ginkgo overhead");
  