1. add benchmarks under (Vortex/benchmarks/..)
  1.1 bfs     --> blas spmv approach
  1.2 kmeans  // stage 2
  1.3 saxpy   --> sample
  1.4 sfilter // stage 2
  1.5 sgemm   --> sample modify (float --> int)
  1.6 vecadd  --> sample