#include <iostream>
#include <chrono>
#include <ROOT/RDataFrame.hxx>

void dftest(uint32_t threads=0)
{
  ROOT::EnableImplicitMT(threads);

  ROOT::RDataFrame r(100000000);
  auto rr = r.Define("v", "rdfentry_")	\
    .Define("w", "return 1./(v+1)")		\
    .Define("x", "v*w")				\
    .Filter("v%100==0");
    
  ROOT::RDF::RResultPtr<TStatistic> stats_iw = rr.Stats("x", "w");


  auto start = std::chrono::high_resolution_clock::now();
  stats_iw->Print();
  auto finish = std::chrono::high_resolution_clock::now();

  std::chrono::duration<double> elapsed=finish-start;
  
  std::cout << threads << "\t" << elapsed.count() << std::endl;
}