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All reduce to print correct number of surface source particles #3901

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Merged
nuclearkevin merged 2 commits into from
Mar 26, 2026
Merged

All reduce to print correct number of surface source particles #3901

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All reduce to print correct number of surface source particles. Refs …
aprilnovak Mar 25, 2026
0dafc33
clang format
aprilnovak Mar 25, 2026
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10 changes: 9 additions & 1 deletion src/state_point.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -592,8 +592,16 @@ void write_source_point(std::string filename, span<SourceSite> source_bank,
const vector<int64_t>& bank_index, bool use_mcpl)
{
std::string ext = use_mcpl ? "mcpl" : "h5";

int total_surf_particles = source_bank.size();
#ifdef OPENMC_MPI
int num_particles = source_bank.size();
MPI_Allreduce(
&num_particles, &total_surf_particles, 1, MPI_INT, MPI_SUM, mpi::intracomm);
#endif

write_message("Creating source file {}.{} with {} particles ...", filename,
ext, source_bank.size(), 5);
ext, total_surf_particles, 5);

// Dispatch to appropriate function based on file type
if (use_mcpl) {
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