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[PWGLF] Optimize memory usage: move jet/area definitions outside event loop and use swap() to release vectors #13386

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Merged
alcaliva merged 1 commit into from
Oct 15, 2025
Merged

[PWGLF] Optimize memory usage: move jet/area definitions outside event loop and use swap() to release vectors #13386

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20 changes: 12 additions & 8 deletions PWGLF/Tasks/Nuspex/antinucleiInJets.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1626,6 +1626,10 @@ struct AntinucleiInJets {
// Event counter
int eventCounter = 0;

// Jet and area definitions
fastjet::JetDefinition jetDef(fastjet::antikt_algorithm, rJet);
fastjet::AreaDefinition areaDef(fastjet::active_area, fastjet::GhostedAreaSpec(1.0));

// Loop over all simulated collisions
for (const auto& collision : collisions) {

Expand Down Expand Up @@ -1675,8 +1679,6 @@ struct AntinucleiInJets {
registryMC.fill(HIST("genEvents"), 2.5);

// Cluster MC particles into jets using anti-kt algorithm
fastjet::JetDefinition jetDef(fastjet::antikt_algorithm, rJet);
fastjet::AreaDefinition areaDef(fastjet::active_area, fastjet::GhostedAreaSpec(1.0));
fastjet::ClusterSequenceArea cs(fjParticles, jetDef, areaDef);
std::vector<fastjet::PseudoJet> jets = fastjet::sorted_by_pt(cs.inclusive_jets());
auto [rhoPerp, rhoMPerp] = backgroundSub.estimateRhoPerpCone(fjParticles, jets);
Expand Down Expand Up @@ -1772,8 +1774,8 @@ struct AntinucleiInJets {

// Shrink large vectors
if (eventCounter % shrinkInterval == 0) {
fjParticles.shrink_to_fit();
protonMomentum.shrink_to_fit();
std::vector<fastjet::PseudoJet>().swap(fjParticles);
std::vector<TVector3>().swap(protonMomentum);
}
}
}
Expand All @@ -1786,6 +1788,10 @@ struct AntinucleiInJets {
std::vector<fastjet::PseudoJet> fjParticles;
std::vector<int> antiprotonTrackIndex;

// Jet and area definitions
fastjet::JetDefinition jetDef(fastjet::antikt_algorithm, rJet);
fastjet::AreaDefinition areaDef(fastjet::active_area, fastjet::GhostedAreaSpec(1.0));

// Event counter
int eventCounter = 0;

Expand Down Expand Up @@ -1870,8 +1876,6 @@ struct AntinucleiInJets {
registryMC.fill(HIST("recEvents"), 8.5);

// Cluster particles using the anti-kt algorithm
fastjet::JetDefinition jetDef(fastjet::antikt_algorithm, rJet);
fastjet::AreaDefinition areaDef(fastjet::active_area, fastjet::GhostedAreaSpec(1.0));
fastjet::ClusterSequenceArea cs(fjParticles, jetDef, areaDef);
std::vector<fastjet::PseudoJet> jets = fastjet::sorted_by_pt(cs.inclusive_jets());
auto [rhoPerp, rhoMPerp] = backgroundSub.estimateRhoPerpCone(fjParticles, jets);
Expand Down Expand Up @@ -2064,8 +2068,8 @@ struct AntinucleiInJets {

// Shrink large vectors
if (eventCounter % shrinkInterval == 0) {
fjParticles.shrink_to_fit();
antiprotonTrackIndex.shrink_to_fit();
std::vector<fastjet::PseudoJet>().swap(fjParticles);
std::vector<int>().swap(antiprotonTrackIndex);
}
}
}
Expand Down
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