diff --git a/source/adios2/toolkit/sst/cp/cp_writer.c b/source/adios2/toolkit/sst/cp/cp_writer.c
index d7e7e7aa06..4a5d55c94b 100644
--- a/source/adios2/toolkit/sst/cp/cp_writer.c
+++ b/source/adios2/toolkit/sst/cp/cp_writer.c
@@ -1495,14 +1495,6 @@ static void CloseWSRStream(CManager cm, void *WSR_Stream_v)
                "Delayed task Moving Reader stream %p to status %s\n",
                CP_WSR_Stream, SSTStreamStatusStr[PeerClosed]);
     CP_PeerFailCloseWSReader(CP_WSR_Stream, PeerClosed);
-
-    if (strncmp("mpi", ParentStream->ConfigParams->DataTransport, 3) == 0 &&
-        CP_WSR_Stream->DP_WSR_Stream)
-    {
-        CP_WSR_Stream->ParentStream->DP_Interface->destroyWriterPerReader(
-            &Svcs, CP_WSR_Stream->DP_WSR_Stream);
-        CP_WSR_Stream->DP_WSR_Stream = NULL;
-    }
     STREAM_MUTEX_UNLOCK(ParentStream);
 }
 
@@ -1554,18 +1546,6 @@ static void CP_PeerFailCloseWSReader(WS_ReaderInfo CP_WSR_Stream,
             CMfree(CMadd_delayed_task(ParentStream->CPInfo->SharedCM->cm, 2, 0,
                                       CloseWSRStream, CP_WSR_Stream));
         }
-        else
-        {
-            if (strncmp("mpi", ParentStream->ConfigParams->DataTransport, 3) ==
-                    0 &&
-                CP_WSR_Stream->DP_WSR_Stream)
-            {
-                CP_WSR_Stream->ParentStream->DP_Interface
-                    ->destroyWriterPerReader(&Svcs,
-                                             CP_WSR_Stream->DP_WSR_Stream);
-                CP_WSR_Stream->DP_WSR_Stream = NULL;
-            }
-        }
     }
     CP_verbose(ParentStream, PerStepVerbose,
                "Moving Reader stream %p to status %s\n", CP_WSR_Stream,
diff --git a/source/adios2/toolkit/sst/dp/mpi_dp.c b/source/adios2/toolkit/sst/dp/mpi_dp.c
index 7604adf59e..e6b89e21a3 100644
--- a/source/adios2/toolkit/sst/dp/mpi_dp.c
+++ b/source/adios2/toolkit/sst/dp/mpi_dp.c
@@ -32,6 +32,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <string.h>
 
 #include <pthread.h>
@@ -243,6 +244,11 @@ static FMStructDescRec MpiWriterContactStructs[] = {
 
 /*****Internal functions*****************************************************/
 
+static uint64_t GetUniqueTaskId()
+{
+  return ((uint32_t)getpid() * (1ll<<32ll)) | (uint32_t)gethostid();
+}
+
 static void MpiReadReplyHandler(CManager cm, CMConnection conn, void *msg_v,
                                 void *client_Data, attr_list attrs);
 
@@ -309,7 +315,7 @@ static DP_RS_Stream MpiInitReader(CP_Services Svcs, void *CP_Stream,
     CMFormat F;
 
     Stream->Stream.CP_Stream = CP_Stream;
-    Stream->Stream.PID = getpid();
+    Stream->Stream.PID = GetUniqueTaskId();
     Stream->Link.Stats = Stats;
 
     SMPI_Comm_rank(comm, &Stream->Stream.Rank);
@@ -362,7 +368,7 @@ static DP_WS_Stream MpiInitWriter(CP_Services Svcs, void *CP_Stream,
     SMPI_Comm_rank(comm, &Stream->Stream.Rank);
 
     Stream->Stream.CP_Stream = CP_Stream;
-    Stream->Stream.PID = getpid();
+    Stream->Stream.PID = GetUniqueTaskId();
     STAILQ_INIT(&Stream->TimeSteps);
     TAILQ_INIT(&Stream->Readers);
 
@@ -420,6 +426,8 @@ MpiInitWriterPerReader(CP_Services Svcs, DP_WS_Stream WS_Stream_v,
         StreamWPR->CohortMpiComms[i] = MPI_COMM_NULL;
     }
 
+    printf("WPR init called %d (rank: %d)\n", readerCohortSize, StreamWR->Stream.Rank);
+
     pthread_mutex_lock(&StreamWR->MutexReaders);
     TAILQ_INSERT_TAIL(&StreamWR->Readers, StreamWPR, entries);
     pthread_mutex_unlock(&StreamWR->MutexReaders);
@@ -890,6 +898,33 @@ static void MpiDestroyWriterPerReader(CP_Services Svcs,
 
     const int CohortSize = StreamWPR->Link.CohortSize;
 
+    printf("WPR soft Destroy called %d (rank: %d)\n", CohortSize, StreamWR->Stream.Rank);
+
+    for (int i = 0; i < CohortSize; i++)
+    {
+        if (StreamWPR->CohortMpiComms[i] != MPI_COMM_NULL)
+        {
+            MPI_Comm_disconnect(&StreamWPR->CohortMpiComms[i]);
+        }
+    }
+}
+
+/**
+ * MpiDestroyWriterPerReader.
+ *
+ * This is called whenever a reader disconnect from a writer. This function
+ * also removes the StreamWPR from its own StreamWR.
+ */
+static void MpiFullyDestroyWriterPerReader(CP_Services Svcs,
+                                      DP_WSR_Stream WSR_Stream_v)
+{
+    MpiStreamWPR StreamWPR = (MpiStreamWPR)WSR_Stream_v;
+    MpiStreamWR StreamWR = StreamWPR->StreamWR;
+
+    const int CohortSize = StreamWPR->Link.CohortSize;
+
+    printf("WPR Destroy called %d (rank: %d)\n", CohortSize, StreamWR->Stream.Rank);
+
     for (int i = 0; i < CohortSize; i++)
     {
         if (StreamWPR->CohortMpiComms[i] != MPI_COMM_NULL)
@@ -908,6 +943,7 @@ static void MpiDestroyWriterPerReader(CP_Services Svcs,
     free(StreamWPR);
 }
 
+
 /**
  * MpiDestroyWriter
  */
@@ -919,7 +955,7 @@ static void MpiDestroyWriter(CP_Services Svcs, DP_WS_Stream WS_Stream_v)
     while (!TAILQ_EMPTY(&StreamWR->Readers))
     {
         MpiStreamWPR Stream = TAILQ_FIRST(&StreamWR->Readers);
-        MpiDestroyWriterPerReader(Svcs, Stream);
+        MpiFullyDestroyWriterPerReader(Svcs, Stream);
     }
     pthread_mutex_unlock(&StreamWR->MutexReaders);