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root_bench.cxx
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root_bench.cxx
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// Compile with:
// $CXX -O3 $(root-config --cflags --libs) -o root_bench root_bench.cxx
#include "ROOT/RDataFrame.hxx"
#include "ROOT/RVec.hxx"
#include "Math/Vector4D.h"
double query1(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto h = df.Histo1D<float>({"", ";MET (GeV);N_{Events}", 100, 0, 200}, "MET_pt");
return h->Integral();
}
double query2(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto h = df.Histo1D<ROOT::RVec<float>>({"", ";Jet p_{T} (GeV);N_{Events}", 100, 15, 60}, "Jet_pt");
return h->Integral();
}
double query3(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto goodJetPt = [](const ROOT::RVec<float> &pt, const ROOT::RVec<float> &eta) { return pt[abs(eta) < 1.0]; };
auto h = df.Define("goodJet_pt", goodJetPt, {"Jet_pt", "Jet_eta"})
.Histo1D<ROOT::RVec<float>>({"", ";Jet p_{T} (GeV);N_{Events}", 100, 15, 60}, "goodJet_pt");
return h->Integral();
}
double query4(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto filter = [](const ROOT::RVec<float> & pt, const ROOT::RVec<float> & eta) {
return Sum(pt > 40) > 1;
};
auto h = df.Filter(filter, {"Jet_pt", "Jet_eta"}, "More than one jet with pt > 40")
.Histo1D<float>({"", ";MET (GeV);N_{Events}", 100, 0, 200}, "MET_pt");
return h->Integral();
}
template <typename T> using Vec = const ROOT::RVec<T>&;
using FourVector = ROOT::Math::PtEtaPhiMVector;
auto compute_dimuon_masses(Vec<float> pt, Vec<float> eta, Vec<float> phi, Vec<float> mass, Vec<int> charge)
{
ROOT::RVec<float> masses;
// std::cout << pt.size() << std::endl;
const auto c = ROOT::VecOps::Combinations(pt, 2);
for (auto i = 0; i < c[0].size(); i++) {
const auto i1 = c[0][i];
const auto i2 = c[1][i];
if (charge[i1] == charge[i2]) continue;
const FourVector p1(pt[i1], eta[i1], phi[i1], mass[i1]);
const FourVector p2(pt[i2], eta[i2], phi[i2], mass[i2]);
masses.push_back((p1 + p2).mass());
}
return masses;
};
double query5(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto h = df.Filter([](unsigned int n) { return n >= 2; }, {"nMuon"}, "At least two muons")
.Define("Dimuon_mass", compute_dimuon_masses,
{"Muon_pt", "Muon_eta", "Muon_phi", "Muon_mass", "Muon_charge"})
.Filter([](const ROOT::RVec<float> &mass) { return Sum(mass > 60 && mass < 120) > 0; }, {"Dimuon_mass"},
"At least one dimuon system with mass in range [60, 120]")
.Histo1D<float>({"", ";MET (GeV);N_{Events}", 100, 0, 200}, "MET_pt");
return h->Integral();
}
using ROOT::Math::XYZTVector;
ROOT::RVec<std::size_t> find_trijet(Vec<XYZTVector> jets) {
const auto c = ROOT::VecOps::Combinations(jets, 3);
float trijet_mass = -1;
float distance = 1e9;
const auto top_mass = 172.5;
std::size_t idx = 0;
for (auto i = 0; i < c[0].size(); i++) {
auto p1 = jets[c[0][i]];
auto p2 = jets[c[1][i]];
auto p3 = jets[c[2][i]];
const auto tmp_mass = (p1 + p2 + p3).mass();
const auto tmp_distance = std::abs(tmp_mass - top_mass);
if (tmp_distance < distance) {
distance = tmp_distance;
trijet_mass = tmp_mass;
idx = i;
}
}
return {c[0][idx], c[1][idx], c[2][idx]};
}
float trijet_pt(Vec<float> pt, Vec<float> eta, Vec<float> phi, Vec<float> mass, Vec<std::size_t> idx)
{
auto p1 = ROOT::Math::PtEtaPhiMVector(pt[idx[0]], eta[idx[0]], phi[idx[0]], mass[idx[0]]);
auto p2 = ROOT::Math::PtEtaPhiMVector(pt[idx[1]], eta[idx[1]], phi[idx[1]], mass[idx[1]]);
auto p3 = ROOT::Math::PtEtaPhiMVector(pt[idx[2]], eta[idx[2]], phi[idx[2]], mass[idx[2]]);
return (p1 + p2 + p3).pt();
}
double query6(const char * filename) {
using ROOT::Math::PtEtaPhiMVector;
using ROOT::VecOps::Construct;
ROOT::RDataFrame df("Events", filename);
auto df2 = df.Filter([](unsigned int n) { return n >= 3; }, {"nJet"}, "At least three jets")
.Define("JetXYZT", [](Vec<float> pt, Vec<float> eta, Vec<float> phi, Vec<float> m) {
return Construct<XYZTVector>(Construct<PtEtaPhiMVector>(pt, eta, phi, m));},
{"Jet_pt", "Jet_eta", "Jet_phi", "Jet_mass"})
.Define("Trijet_idx", find_trijet, {"JetXYZT"});
auto h1 = df2.Define("Trijet_pt", trijet_pt, {"Jet_pt", "Jet_eta", "Jet_phi", "Jet_mass", "Trijet_idx"})
.Histo1D<float>({"", ";Trijet pt (GeV);N_{Events}", 100, 15, 40}, "Trijet_pt");
auto h2 = df2.Define("Trijet_leadingBtag",
[](const ROOT::RVec<float> &btag, const ROOT::RVec<std::size_t> &idx) { return Max(Take(btag, idx)); },
{"Jet_btag", "Trijet_idx"})
.Histo1D<float>({"", ";Trijet leading b-tag;N_{Events}", 100, 0, 1}, "Trijet_leadingBtag");
return h1->Integral() + h2->Integral();
}
ROOT::RVec<int> find_isolated_jets(Vec<float> eta1, Vec<float> phi1, Vec<float> pt2, Vec<float> eta2, Vec<float> phi2)
{
ROOT::RVec<int> mask(eta1.size(), 1);
if (eta2.size() == 0) {
return mask;
}
const auto ptcut = pt2 > 10;
const auto eta2_ptcut = eta2[ptcut];
const auto phi2_ptcut = phi2[ptcut];
if (eta2_ptcut.size() == 0) {
return mask;
}
const auto c = ROOT::VecOps::Combinations(eta1, eta2_ptcut);
for (auto i = 0; i < c[0].size(); i++) {
const auto i1 = c[0][i];
const auto i2 = c[1][i];
const auto dr = ROOT::VecOps::DeltaR(eta1[i1], eta2_ptcut[i2], phi1[i1], phi2_ptcut[i2]);
if (dr < 0.4) mask[i1] = 0;
}
return mask;
}
double query7(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto h = df.Filter([](unsigned int n) { return n > 0; }, {"nJet"}, "At least one jet")
.Define("goodJet_ptcut", [](const ROOT::RVec<float>& pt) { return pt > 30; }, {"Jet_pt"})
.Define("goodJet_antiMuon",
find_isolated_jets,
{"Jet_eta", "Jet_phi", "Muon_pt", "Muon_eta", "Muon_phi"})
.Define("goodJet_antiElectron",
find_isolated_jets,
{"Jet_eta", "Jet_phi", "Electron_pt", "Electron_eta", "Electron_phi"})
.Define("goodJet",
[](const ROOT::RVec<int> &pt, const ROOT::RVec<int> &muon, const ROOT::RVec<int> &electron) {
return pt && muon && electron;
},
{"goodJet_ptcut", "goodJet_antiMuon", "goodJet_antiElectron"})
.Filter([](const ROOT::RVec<int> &good) { return Sum(good) > 0; }, {"goodJet"})
.Define("goodJet_sumPt",
[](const ROOT::RVec<int> &good, const ROOT::RVec<float> &pt) { return Sum(pt[good]); },
{"goodJet", "Jet_pt"})
.Histo1D<float>({"", ";Jet p_{T} sum (GeV);N_{Events}", 100, 15, 200}, "goodJet_sumPt");
return h->Integral();
}
unsigned int additional_lepton_idx(Vec<float> pt, Vec<float> eta, Vec<float> phi, Vec<float> mass, Vec<int> charge, Vec<int> flavour)
{
const auto c = Combinations(pt, 2);
unsigned int lep_idx = -999;
float best_mass = 99999;
int best_i1 = -1;
int best_i2 = -1;
const auto z_mass = 91.2;
const auto make_p4 = [&](std::size_t idx) {
return ROOT::Math::PtEtaPhiMVector(pt[idx], eta[idx], phi[idx], mass[idx]);
};
for (auto i = 0; i < c[0].size(); i++) {
const auto i1 = c[0][i];
const auto i2 = c[1][i];
if (charge[i1] == charge[i2]) continue;
if (flavour[i1] != flavour[i2]) continue;
const auto p1 = make_p4(i1);
const auto p2 = make_p4(i2);
const auto tmp_mass = (p1 + p2).mass();
if (std::abs(tmp_mass - z_mass) < std::abs(best_mass - z_mass)) {
best_mass = tmp_mass;
best_i1 = i1;
best_i2 = i2;
}
}
if (best_i1 == -1) return lep_idx;
float max_pt = -999;
for (auto i = 0; i < pt.size(); i++) {
if (i != best_i1 && i != best_i2 && pt[i] > max_pt) {
max_pt = pt[i];
lep_idx = i;
}
}
return lep_idx;
}
double query8(const char * filename) {
ROOT::RDataFrame df("Events", filename);
auto concatF = [](const ROOT::RVec<float> &a, const ROOT::RVec<float> &b) { return Concatenate(a, b); };
auto concatI = [](const ROOT::RVec<int> &a, const ROOT::RVec<int> &b) { return Concatenate(a, b); };
auto transverseMass = [](const ROOT::RVec<float> &Lepton_pt, const ROOT::RVec<float> &Lepton_phi,
float MET_pt, float MET_phi, unsigned int idx) {
return sqrt(2.0 * Lepton_pt[idx] * MET_pt * (1.0 - cos(ROOT::VecOps::DeltaPhi(MET_phi, Lepton_phi[idx]))));
};
auto h = df.Filter([](unsigned int nElectron, unsigned int nMuon) { return nElectron + nMuon > 2; },
{"nElectron", "nMuon"}, "At least three leptons")
.Define("Lepton_pt", concatF, {"Muon_pt", "Electron_pt"})
.Define("Lepton_eta", concatF, {"Muon_eta", "Electron_eta"})
.Define("Lepton_phi", concatF, {"Muon_phi", "Electron_phi"})
.Define("Lepton_mass", concatF, {"Muon_mass", "Electron_mass"})
.Define("Lepton_charge", concatI, {"Muon_charge", "Electron_charge"})
.Define("Lepton_flavour",[](unsigned int nMuon, unsigned int nElectron) {
return Concatenate(ROOT::RVec<int>(nMuon, 0), ROOT::RVec<int>(nElectron, 1));
},
{"nMuon", "nElectron"})
.Define("AdditionalLepton_idx", additional_lepton_idx,
{"Lepton_pt", "Lepton_eta", "Lepton_phi", "Lepton_mass", "Lepton_charge", "Lepton_flavour"})
.Filter([](unsigned int idx) { return idx != -999; }, {"AdditionalLepton_idx"}, "No valid lepton pair found.")
.Define("TransverseMass", transverseMass,
{"Lepton_pt", "Lepton_phi", "MET_pt", "MET_phi", "AdditionalLepton_idx"})
.Histo1D<double>({"", ";Transverse mass (GeV);N_{Events}", 100, 0, 200}, "TransverseMass");
return h->Integral();
}
int main(int argc, const char ** argv) {
if ( argc != 3 ) {
std::cout << "Usage: PROG ncores filename" << std::endl;
return 1;
}
int ncores = std::stoi(argv[1]);
const char * filename = argv[2];
if ( ncores > 1 ) {
ROOT::EnableImplicitMT(ncores);
}
std::cout << "query,ncores,walltime" << std::endl;
auto tic = std::chrono::steady_clock::now();
query1(filename);
auto toc = std::chrono::steady_clock::now();
std::chrono::duration<double> diff = toc - tic;
std::cout << "Q1," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query2(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q2," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query3(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q3," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query4(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q4," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query5(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q5," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query6(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q6," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query7(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q7," << ncores << "," << diff.count() << std::endl;
tic = std::chrono::steady_clock::now();
query8(filename);
toc = std::chrono::steady_clock::now();
diff = toc - tic;
std::cout << "Q8," << ncores << "," << diff.count() << std::endl;
return 0;
}