mp104_processH1.C

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/// \file
/// \ingroup tutorial_multicore
/// \notebook -nodraw
/// Illustrate the usage of the multiproc to process the H1 analysis
/// example.
///
/// \macro_code
///
/// \author Gerardo Ganis
 
#include "TString.h"
#include "TROOT.h"
#include "TTree.h"
#include "TH1F.h"
#include "TH2F.h"
#include "TEntryList.h"
#include "TTreeReader.h"
#include "TTreeReaderArray.h"
#include "TTreeReaderValue.h"
#include "TSystem.h"
#include "TMath.h"
#include "TCanvas.h"
#include "TStyle.h"
#include "TF1.h"
#include "TLine.h"
#include "TPaveStats.h"
#include "TStopwatch.h"
#include "ROOT/TTreeProcessorMP.hxx"
 
static std::string tutname = "mp104_processH1: ";
static std::string logfile = "mp104_processH1.log";
static RedirectHandle_t gRH;
 
std::vector<std::string> files {"http://root.cern/files/h1/dstarmb.root",
                                "http://root.cern/files/h1/dstarp1a.root",
                                "http://root.cern/files/h1/dstarp1b.root",
                                "http://root.cern/files/h1/dstarp2.root"};
 
int mp104_processH1()
{
 
   // MacOSX may generate connection to WindowServer errors
   gROOT->SetBatch(kTRUE);
 
   TStopwatch stp;
 
   // Check and fit lambdas
   #include "mp_H1_lambdas.C"
 
   ROOT::TTreeProcessorMP pool(3);
 
   std::cout << tutname << "processing the H1 dataset with a lambda \n";
 
   auto hListFun = pool.Process(files, doH1, "h42");
 
   // Check the output
   if (checkH1(hListFun) < 0)
      return -1;
 
   // Do the fit
   if (doFit(hListFun, logfile.c_str()) < 0)
      return -1;
 
   stp.Print();
   stp.Start();
 
   // Run the analysis with a selector
 
   TString selectorPath = gROOT->GetTutorialDir();
   selectorPath += "/io/tree/h1analysisTreeReader.C+";
   std::cout << tutname << "processing the H1 dataset with selector '" << selectorPath << "'\n";
   auto sel = TSelector::GetSelector(selectorPath);
 
   // In a second run we use sel
   gSystem->RedirectOutput(logfile.c_str(), "w", &gRH);
   auto hListSel = pool.Process(files, *sel, "h42");
   gSystem->RedirectOutput(nullptr, nullptr, &gRH);
 
   // Check the output
   if (checkH1(hListSel) < 0)
      return -1;
 
   // Do the fit
   if (doFit(hListSel, logfile.c_str()) < 0)
      return -1;
 
   stp.Print();
   stp.Start();
 
   return 0;
}