lars
068cf93604
Concurrent job launches can land in the same wall-clock second, causing G4System::init's time-based seed (seed=-1) to collide and produce byte-identical physics across separately-named shards. Falls back to the existing time-based seed if the variable is unset, empty, or invalid. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
#include "GeometryDescriptor.hh"
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#include "G4System.hh"
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#include <cstdlib>
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#include <iostream>
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#include <string>
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#include <vector>
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int main(int argc, char** argv) {
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int nEvents = 10;
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int seed = -1;
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if (const char* seedEnv = std::getenv("MINICALOSIM_SEED")) {
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try {
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std::size_t pos = 0;
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std::string seedStr(seedEnv);
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int parsed = std::stoi(seedStr, &pos);
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if (pos == seedStr.size()) seed = parsed;
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} catch (const std::exception&) {
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// Not a valid integer; fall back to time-based seed.
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}
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}
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if (argc > 2) {
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std::cerr << "Usage: run_pbwo4 [nEvents]" << std::endl;
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return 1;
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}
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if (argc == 2) {
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try {
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nEvents = std::stoi(argv[1]);
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if (nEvents <= 0) throw std::invalid_argument("must be positive");
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} catch (const std::exception& e) {
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std::cerr << "Invalid nEvents '" << argv[1] << "': " << e.what() << std::endl;
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return 1;
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}
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}
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std::string outfile = "pbwo4_" + std::to_string(nEvents) + "events_hits.root";
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GeometryDescriptor gd;
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gd.addLayer(20.0, "G4_PbWO4", true, 10, 10);
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G4System g4;
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g4.init(gd, seed);
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g4.run_batch(nEvents, {"e-"}, 1.0, 1.0, outfile);
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std::cout << "Saved " << nEvents << " events to " << outfile << std::endl;
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return 0;
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}
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