added more explicit error messages for MpiHandsake

source/adios2/helper/adiosMpiHandshake.cpp

@@ -92,18 +92,16 @@ void MpiHandshake::Test()
     }
 }
 
-bool MpiHandshake::Check(const std::string &filename)
+bool MpiHandshake::Check(const std::string &filename, const bool verbose)
 {
-    int m_Verbosity = 1;
-
     Test();
 
     // check if RendezvousAppCount reached
 
     if (m_WritersMap[filename].size() + m_ReadersMap[filename].size() !=
         m_RendezvousAppCounts[filename])
     {
-        if (m_Verbosity >= 10)
+        if (verbose)
         {
             std::cout << "MpiHandshake Rank " << m_WorldRank << " Stream "
                       << filename << ": " << m_WritersMap[filename].size()
@@ -212,14 +210,15 @@ void MpiHandshake::Handshake(const std::string &filename, const char mode,
     // wait and check if required RendezvousAppCount reached
 
     auto startTime = std::chrono::system_clock::now();
-    while (!Check(filename))
+    while (!Check(filename, false))
     {
         std::this_thread::sleep_for(std::chrono::microseconds(100));
         auto nowTime = std::chrono::system_clock::now();
         auto duration = std::chrono::duration_cast<std::chrono::seconds>(
             nowTime - startTime);
         if (duration.count() > timeoutSeconds)
         {
+            Check(filename, true);
             throw(std::runtime_error("Mpi handshake timeout on Rank" +
                                      std::to_string(m_WorldRank) +
                                      " for Stream " + filename));

source/adios2/helper/adiosMpiHandshake.h

@@ -97,7 +97,7 @@ class MpiHandshake
 
 private:
     static void Test();
-    static bool Check(const std::string &filename);
+    static bool Check(const std::string &filename, const bool verbose);
     static size_t PlaceInBuffer(const size_t stream, const int rank);
     static void PrintMaps();
     static void PrintMaps(const int printRank, const std::string &filename);