Removed MPI_COMM_SELF from headers, fixed bug in VariableBase

source/adios2/core/IO.h

@@ -42,7 +42,7 @@ public:
 
     /** from ADIOS class passed to Engine created with Open
      *  if no new communicator is passed */
-    MPI_Comm m_MPIComm = MPI_COMM_SELF;
+    MPI_Comm m_MPIComm;
 
     /** true: extra exceptions checks */
     const bool m_DebugMode = false;

source/adios2/core/VariableBase.cpp

@@ -112,8 +112,8 @@ void VariableBase::SetMemorySelection(const SelectionBoundingBox &selection)
         }
     }
 
-    ConvertUint64VectorToSizetVector(selection.m_Count, m_MemoryCount);
-    ConvertUint64VectorToSizetVector(selection.m_Start, m_MemoryStart);
+    m_MemoryCount = selection.m_Count;
+    m_MemoryStart = selection.m_Start;
 }
 
 void VariableBase::SetStepSelection(const unsigned int startStep,

source/adios2/toolkit/interop/adios1/ADIOS1Common.h

@@ -73,7 +73,7 @@ public:
     void Close();
 
 private:
-    MPI_Comm m_MPIComm = MPI_COMM_SELF;
+    MPI_Comm m_MPIComm;
     const bool m_DebugMode = false;
 
     void Init();