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-rw-r--r--Source/Diagnostics/ReducedDiags/FieldProbe.cpp8
1 files changed, 6 insertions, 2 deletions
diff --git a/Source/Diagnostics/ReducedDiags/FieldProbe.cpp b/Source/Diagnostics/ReducedDiags/FieldProbe.cpp
index c63071faa..6bafcf01b 100644
--- a/Source/Diagnostics/ReducedDiags/FieldProbe.cpp
+++ b/Source/Diagnostics/ReducedDiags/FieldProbe.cpp
@@ -617,13 +617,17 @@ void FieldProbe::ComputeDiags (int step)
if (amrex::ParallelDescriptor::IOProcessor()) {
length_vector.resize(mpisize, 0);
}
- localsize.resize(1,0);
- localsize[0] = m_data.size();
+ localsize.resize(1, m_data.size());
+#ifdef AMREX_USE_MPI
// gather size of m_data from each processor
amrex::ParallelDescriptor::Gather(localsize.data(), 1,
length_vector.data(), 1,
amrex::ParallelDescriptor::IOProcessorNumber());
+#else
+ // work-around for https://github.com/AMReX-Codes/amrex/pull/2793
+ length_vector[0] = localsize[0];
+#endif
// IO processor sums values from length_array to get size of total output array.
/* displs records the size of each m_data as well as previous displs. This array