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Check if implicit diagnostics file exist before writing the header #5750

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4 changes: 3 additions & 1 deletion Source/NonlinearSolvers/NewtonSolver.H
Original file line number Diff line number Diff line change
Expand Up @@ -204,7 +204,9 @@ void NewtonSolver<Vec,Ops>::Define ( const Vec& a_U,
this->m_is_defined = true;

// Create diagnostic file and write header
if (!this->m_diagnostic_file.empty() && amrex::ParallelDescriptor::IOProcessor()) {
if (amrex::ParallelDescriptor::IOProcessor()
&& !this->m_diagnostic_file.empty()
&& !amrex::FileExists(this->m_diagnostic_file)) {

std::filesystem::path const diagnostic_path(this->m_diagnostic_file);
std::filesystem::path const diagnostic_dir = diagnostic_path.parent_path();
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