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Added MCC collisions cost to load balancing calculation #2584

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Merged
merged 1 commit into from
Nov 19, 2021
Merged

Added MCC collisions cost to load balancing calculation #2584

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1 change: 1 addition & 0 deletions Source/Particles/Collision/BackgroundMCCCollision.H
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ public:
*/
void doBackgroundIonization (
int lev,
amrex::LayoutData<amrex::Real>* cost,
WarpXParticleContainer& species1,
WarpXParticleContainer& species2
);
Expand Down
35 changes: 32 additions & 3 deletions Source/Particles/Collision/BackgroundMCCCollision.cpp
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Expand Up @@ -209,18 +209,33 @@ BackgroundMCCCollision::doCollisions (amrex::Real cur_time, MultiParticleContain
auto const flvl = species1.finestLevel();
for (int lev = 0; lev <= flvl; ++lev) {

auto cost = WarpX::getCosts(lev);

// firstly loop over particles box by box and do all particle conserving
// scattering
#ifdef _OPENMP
#pragma omp parallel if (amrex::Gpu::notInLaunchRegion())
#endif
for (WarpXParIter pti(species1, lev); pti.isValid(); ++pti) {
if (cost && WarpX::load_balance_costs_update_algo == LoadBalanceCostsUpdateAlgo::Timers)
{
amrex::Gpu::synchronize();
}
amrex::Real wt = amrex::second();

doBackgroundCollisionsWithinTile(pti);

if (cost && WarpX::load_balance_costs_update_algo == LoadBalanceCostsUpdateAlgo::Timers)
{
amrex::Gpu::synchronize();
wt = amrex::second() - wt;
amrex::HostDevice::Atomic::Add( &(*cost)[pti.index()], wt);
}
}

// secondly perform ionization through the SmartCopyFactory if needed
if (ionization_flag) {
doBackgroundIonization(lev, species1, species2);
doBackgroundIonization(lev, cost, species1, species2);
}
}
}
Expand Down Expand Up @@ -348,8 +363,8 @@ void BackgroundMCCCollision::doBackgroundCollisionsWithinTile


void BackgroundMCCCollision::doBackgroundIonization
( int lev, WarpXParticleContainer& species1,
WarpXParticleContainer& species2)
( int lev, amrex::LayoutData<amrex::Real>* cost,
WarpXParticleContainer& species1, WarpXParticleContainer& species2)
{
WARPX_PROFILE("BackgroundMCCCollision::doBackgroundIonization()");

Expand All @@ -372,6 +387,13 @@ void BackgroundMCCCollision::doBackgroundIonization
#pragma omp parallel if (amrex::Gpu::notInLaunchRegion())
#endif
for (WarpXParIter pti(species1, lev); pti.isValid(); ++pti) {

if (cost && WarpX::load_balance_costs_update_algo == LoadBalanceCostsUpdateAlgo::Timers)
{
amrex::Gpu::synchronize();
}
amrex::Real wt = amrex::second();

auto& elec_tile = species1.ParticlesAt(lev, pti);
auto& ion_tile = species2.ParticlesAt(lev, pti);

Expand All @@ -389,5 +411,12 @@ void BackgroundMCCCollision::doBackgroundIonization

setNewParticleIDs(elec_tile, np_elec, num_added);
setNewParticleIDs(ion_tile, np_ion, num_added);

if (cost && WarpX::load_balance_costs_update_algo == LoadBalanceCostsUpdateAlgo::Timers)
{
amrex::Gpu::synchronize();
wt = amrex::second() - wt;
amrex::HostDevice::Atomic::Add( &(*cost)[pti.index()], wt);
}
}
}