don't use is_valid to validate datatypes for replay/ti-tracing

diff --git a/src/smpi/bindings/smpi_pmpi_coll.cpp b/src/smpi/bindings/smpi_pmpi_coll.cpp
index aaf32c3..28ab3ae 100644 (file)
--- a/src/smpi/bindings/smpi_pmpi_coll.cpp
+++ b/src/smpi/bindings/smpi_pmpi_coll.cpp
@@ -29,7 +29,7 @@ int PMPI_Bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm c
     int rank        = smpi_process()->index();
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData("bcast", comm->group()->index(root), -1.0,
-                                                      datatype->is_basic() ? count : count * datatype->size(), -1,
+                                                      datatype->is_replayable() ? count : count * datatype->size(), -1,
                                                       encode_datatype(datatype), ""));
     if (comm->size() > 1)
       simgrid::smpi::Colls::bcast(buf, count, datatype, root, comm);
@@ -95,8 +95,8 @@ int PMPI_Gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbu
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData(
                            "gather", comm->group()->index(root), -1.0,
-                           sendtmptype->is_basic() ? sendtmpcount : sendtmpcount * sendtmptype->size(),
-                           (comm->rank() != root || recvtype->is_basic()) ? recvcount : recvcount * recvtype->size(),
+                           sendtmptype->is_replayable() ? sendtmpcount : sendtmpcount * sendtmptype->size(),
+                           (comm->rank() != root || recvtype->is_replayable()) ? recvcount : recvcount * recvtype->size(),
                            encode_datatype(sendtmptype), encode_datatype(recvtype)));
 
     simgrid::smpi::Colls::gather(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, root, comm);
@@ -135,7 +135,7 @@ int PMPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recv
     }
 
     int rank         = smpi_process()->index();
-    int dt_size_recv = recvtype->is_basic() ? 1 : recvtype->size();
+    int dt_size_recv = recvtype->is_replayable() ? 1 : recvtype->size();
 
     std::vector<int>* trace_recvcounts = new std::vector<int>;
     if (comm->rank() == root) {
@@ -146,7 +146,7 @@ int PMPI_Gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recv
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::VarCollTIData(
                            "gatherV", comm->group()->index(root),
-                           sendtmptype->is_basic() ? sendtmpcount : sendtmpcount * sendtmptype->size(), nullptr,
+                           sendtmptype->is_replayable() ? sendtmpcount : sendtmpcount * sendtmptype->size(), nullptr,
                            dt_size_recv, trace_recvcounts, encode_datatype(sendtmptype), encode_datatype(recvtype)));
 
     retval = simgrid::smpi::Colls::gatherv(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcounts, displs, recvtype, root, comm);
@@ -182,8 +182,8 @@ int PMPI_Allgather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
 
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData("allGather", -1, -1.0,
-                                                      sendtype->is_basic() ? sendcount : sendcount * sendtype->size(),
-                                                      recvtype->is_basic() ? recvcount : recvcount * recvtype->size(),
+                                                      sendtype->is_replayable() ? sendcount : sendcount * sendtype->size(),
+                                                      recvtype->is_replayable() ? recvcount : recvcount * recvtype->size(),
                                                       encode_datatype(sendtype), encode_datatype(recvtype)));
 
     simgrid::smpi::Colls::allgather(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm);
@@ -216,7 +216,7 @@ int PMPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
       sendtype=recvtype;
     }
     int rank               = smpi_process()->index();
-    int dt_size_recv       = recvtype->is_basic() ? 1 : recvtype->size();
+    int dt_size_recv       = recvtype->is_replayable() ? 1 : recvtype->size();
 
     std::vector<int>* trace_recvcounts = new std::vector<int>;
     for (int i = 0; i < comm->size(); i++) // copy data to avoid bad free
@@ -224,7 +224,7 @@ int PMPI_Allgatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
 
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::VarCollTIData(
-                           "allGatherV", -1, sendtype->is_basic() ? sendcount : sendcount * sendtype->size(), nullptr,
+                           "allGatherV", -1, sendtype->is_replayable() ? sendcount : sendcount * sendtype->size(), nullptr,
                            dt_size_recv, trace_recvcounts, encode_datatype(sendtype), encode_datatype(recvtype)));
 
     simgrid::smpi::Colls::allgatherv(sendbuf, sendcount, sendtype, recvbuf, recvcounts, displs, recvtype, comm);
@@ -262,8 +262,8 @@ int PMPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData(
                            "scatter", comm->group()->index(root), -1.0,
-                           (comm->rank() != root || sendtype->is_basic()) ? sendcount : sendcount * sendtype->size(),
-                           recvtype->is_basic() ? recvcount : recvcount * recvtype->size(), encode_datatype(sendtype),
+                           (comm->rank() != root || sendtype->is_replayable()) ? sendcount : sendcount * sendtype->size(),
+                           recvtype->is_replayable() ? recvcount : recvcount * recvtype->size(), encode_datatype(sendtype),
                            encode_datatype(recvtype)));
 
     simgrid::smpi::Colls::scatter(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, root, comm);
@@ -295,7 +295,7 @@ int PMPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
       recvcount = sendcounts[comm->rank()];
     }
     int rank               = smpi_process()->index();
-    int dt_size_send       = sendtype->is_basic() ? 1 : sendtype->size();
+    int dt_size_send       = sendtype->is_replayable() ? 1 : sendtype->size();
 
     std::vector<int>* trace_sendcounts = new std::vector<int>;
     if (comm->rank() == root) {
@@ -305,7 +305,7 @@ int PMPI_Scatterv(void *sendbuf, int *sendcounts, int *displs,
 
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::VarCollTIData(
                                                "scatterV", comm->group()->index(root), dt_size_send, trace_sendcounts,
-                                               recvtype->is_basic() ? recvcount : recvcount * recvtype->size(), nullptr,
+                                               recvtype->is_replayable() ? recvcount : recvcount * recvtype->size(), nullptr,
                                                encode_datatype(sendtype), encode_datatype(recvtype)));
 
     retval = simgrid::smpi::Colls::scatterv(sendbuf, sendcounts, displs, sendtype, recvbuf, recvcount, recvtype, root, comm);
@@ -332,7 +332,7 @@ int PMPI_Reduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
 
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData("reduce", comm->group()->index(root), 0,
-                                                      datatype->is_basic() ? count : count * datatype->size(), -1,
+                                                      datatype->is_replayable() ? count : count * datatype->size(), -1,
                                                       encode_datatype(datatype), ""));
 
     simgrid::smpi::Colls::reduce(sendbuf, recvbuf, count, datatype, op, root, comm);
@@ -382,7 +382,7 @@ int PMPI_Allreduce(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatyp
 
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::CollTIData("allReduce", -1, 0,
-                                                      datatype->is_basic() ? count : count * datatype->size(), -1,
+                                                      datatype->is_replayable() ? count : count * datatype->size(), -1,
                                                       encode_datatype(datatype), ""));
 
     simgrid::smpi::Colls::allreduce(sendtmpbuf, recvbuf, count, datatype, op, comm);
@@ -414,7 +414,7 @@ int PMPI_Scan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MP
     int rank               = smpi_process()->index();
 
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData(
-                                               "scan", -1, datatype->is_basic() ? count : count * datatype->size(),
+                                               "scan", -1, datatype->is_replayable() ? count : count * datatype->size(),
                                                encode_datatype(datatype)));
 
     retval = simgrid::smpi::Colls::scan(sendbuf, recvbuf, count, datatype, op, comm);
@@ -446,7 +446,7 @@ int PMPI_Exscan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
     }
 
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData(
-                                               "exscan", -1, datatype->is_basic() ? count : count * datatype->size(),
+                                               "exscan", -1, datatype->is_replayable() ? count : count * datatype->size(),
                                                encode_datatype(datatype)));
 
     retval = simgrid::smpi::Colls::exscan(sendtmpbuf, recvbuf, count, datatype, op, comm);
@@ -476,7 +476,7 @@ int PMPI_Reduce_scatter(void *sendbuf, void *recvbuf, int *recvcounts, MPI_Datat
   } else {
     int rank               = smpi_process()->index();
     std::vector<int>* trace_recvcounts = new std::vector<int>;
-    int dt_send_size                   = datatype->is_basic() ? 1 : datatype->size();
+    int dt_send_size                   = datatype->is_replayable() ? 1 : datatype->size();
     int totalcount    = 0;
 
     for (int i = 0; i < comm->size(); i++) { // copy data to avoid bad free
@@ -524,7 +524,7 @@ int PMPI_Reduce_scatter_block(void *sendbuf, void *recvbuf, int recvcount,
     int count = comm->size();
 
     int rank               = smpi_process()->index();
-    int dt_send_size                   = datatype->is_basic() ? 1 : datatype->size();
+    int dt_send_size                   = datatype->is_replayable() ? 1 : datatype->size();
     std::vector<int>* trace_recvcounts = new std::vector<int>(recvcount * dt_send_size); // copy data to avoid bad free
 
     void* sendtmpbuf       = sendbuf;
@@ -579,8 +579,8 @@ int PMPI_Alltoall(void* sendbuf, int sendcount, MPI_Datatype sendtype, void* rec
     TRACE_smpi_comm_in(
         rank, __FUNCTION__,
         new simgrid::instr::CollTIData("allToAll", -1, -1.0,
-                                       sendtmptype->is_basic() ? sendtmpcount : sendtmpcount * sendtmptype->size(),
-                                       recvtype->is_basic() ? recvcount : recvcount * recvtype->size(),
+                                       sendtmptype->is_replayable() ? sendtmpcount : sendtmpcount * sendtmptype->size(),
+                                       recvtype->is_replayable() ? recvcount : recvcount * recvtype->size(),
                                        encode_datatype(sendtmptype), encode_datatype(recvtype)));
 
     retval = simgrid::smpi::Colls::alltoall(sendtmpbuf, sendtmpcount, sendtmptype, recvbuf, recvcount, recvtype, comm);

diff --git a/src/smpi/bindings/smpi_pmpi_request.cpp b/src/smpi/bindings/smpi_pmpi_request.cpp
index fd9d4a6..4b113d6 100644 (file)
--- a/src/smpi/bindings/smpi_pmpi_request.cpp
+++ b/src/smpi/bindings/smpi_pmpi_request.cpp
@@ -161,7 +161,7 @@ int PMPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MP
 
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("Irecv", comm->group()->index(src),
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
 
     *request = simgrid::smpi::Request::irecv(buf, count, datatype, src, tag, comm);
@@ -202,7 +202,7 @@ int PMPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     int trace_dst = comm->group()->index(dst);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("Isend", trace_dst,
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
 
     TRACE_smpi_send(rank, rank, trace_dst, tag, count * datatype->size());
@@ -244,7 +244,7 @@ int PMPI_Issend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, M
     int trace_dst = comm->group()->index(dst);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("ISsend", trace_dst,
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
     TRACE_smpi_send(rank, rank, trace_dst, tag, count * datatype->size());
 
@@ -284,7 +284,7 @@ int PMPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI
     int src_traced         = comm->group()->index(src);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("recv", src_traced,
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
 
     simgrid::smpi::Request::recv(buf, count, datatype, src, tag, comm, status);
@@ -327,7 +327,7 @@ int PMPI_Send(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI
     int dst_traced         = comm->group()->index(dst);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("send", dst_traced,
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
     if (not TRACE_smpi_view_internals()) {
       TRACE_smpi_send(rank, rank, dst_traced, tag,count*datatype->size());
@@ -365,7 +365,7 @@ int PMPI_Ssend(void* buf, int count, MPI_Datatype datatype, int dst, int tag, MP
     int dst_traced         = comm->group()->index(dst);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::Pt2PtTIData("Ssend", dst_traced,
-                                                       datatype->is_basic() ? count : count * datatype->size(),
+                                                       datatype->is_replayable() ? count : count * datatype->size(),
                                                        encode_datatype(datatype)));
     TRACE_smpi_send(rank, rank, dst_traced, tag, count * datatype->size());
 
@@ -414,8 +414,8 @@ int PMPI_Sendrecv(void* sendbuf, int sendcount, MPI_Datatype sendtype, int dst,
     src_hack->push_back(src_traced);
     TRACE_smpi_comm_in(rank, __FUNCTION__,
                        new simgrid::instr::VarCollTIData(
-                           "sendRecv", -1, sendtype->is_basic() ? sendcount : sendcount * sendtype->size(), dst_hack,
-                           recvtype->is_basic() ? recvcount : recvcount * recvtype->size(), src_hack,
+                           "sendRecv", -1, sendtype->is_replayable() ? sendcount : sendcount * sendtype->size(), dst_hack,
+                           recvtype->is_replayable() ? recvcount : recvcount * recvtype->size(), src_hack,
                            encode_datatype(sendtype), encode_datatype(recvtype)));
 
     TRACE_smpi_send(rank, rank, dst_traced, sendtag, sendcount * sendtype->size());

diff --git a/src/smpi/bindings/smpi_pmpi_win.cpp b/src/smpi/bindings/smpi_pmpi_win.cpp
index 71d64a1..eb5aa7b 100644 (file)
--- a/src/smpi/bindings/smpi_pmpi_win.cpp
+++ b/src/smpi/bindings/smpi_pmpi_win.cpp
@@ -199,7 +199,7 @@ int PMPI_Get( void *origin_addr, int origin_count, MPI_Datatype origin_datatype,
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Get", target_rank,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
 
     retval = win->get( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
@@ -238,7 +238,7 @@ int PMPI_Rget( void *origin_addr, int origin_count, MPI_Datatype origin_datatype
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Rget", target_rank,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
 
     retval = win->get( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
@@ -275,7 +275,7 @@ int PMPI_Put( void *origin_addr, int origin_count, MPI_Datatype origin_datatype,
     win->get_group(&group);
     int dst_traced = group->index(target_rank);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Put", dst_traced,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
     TRACE_smpi_send(rank, rank, dst_traced, SMPI_RMA_TAG, origin_count*origin_datatype->size());
 
@@ -316,7 +316,7 @@ int PMPI_Rput( void *origin_addr, int origin_count, MPI_Datatype origin_datatype
     win->get_group(&group);
     int dst_traced = group->index(target_rank);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Rput", dst_traced,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
     TRACE_smpi_send(rank, rank, dst_traced, SMPI_RMA_TAG, origin_count*origin_datatype->size());
 
@@ -355,7 +355,7 @@ int PMPI_Accumulate( void *origin_addr, int origin_count, MPI_Datatype origin_da
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Accumulate", target_rank,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
     retval = win->accumulate( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
                                   target_datatype, op);
@@ -395,7 +395,7 @@ int PMPI_Raccumulate( void *origin_addr, int origin_count, MPI_Datatype origin_d
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Raccumulate", target_rank,
-                                                       origin_datatype->is_basic() ? origin_count : origin_count * origin_datatype->size(),
+                                                       origin_datatype->is_replayable() ? origin_count : origin_count * origin_datatype->size(),
                                                        encode_datatype(origin_datatype)));
 
     retval = win->accumulate( origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count,
@@ -435,7 +435,7 @@ MPI_Datatype target_datatype, MPI_Op op, MPI_Win win){
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Get_accumulate", target_rank,
-                                                       target_datatype->is_basic() ? target_count : target_count * target_datatype->size(),
+                                                       target_datatype->is_replayable() ? target_count : target_count * target_datatype->size(),
                                                        encode_datatype(target_datatype)));
 
     retval = win->get_accumulate( origin_addr, origin_count, origin_datatype, result_addr,
@@ -480,7 +480,7 @@ MPI_Datatype target_datatype, MPI_Op op, MPI_Win win, MPI_Request* request){
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Rget_accumulate", target_rank,
-                                                       target_datatype->is_basic() ? target_count : target_count * target_datatype->size(),
+                                                       target_datatype->is_replayable() ? target_count : target_count * target_datatype->size(),
                                                        encode_datatype(target_datatype)));
 
     retval = win->get_accumulate( origin_addr, origin_count, origin_datatype, result_addr,
@@ -520,7 +520,7 @@ int PMPI_Compare_and_swap(void* origin_addr, void* compare_addr, void* result_ad
     MPI_Group group;
     win->get_group(&group);
     TRACE_smpi_comm_in(rank, __FUNCTION__, new simgrid::instr::Pt2PtTIData("Compare_and_swap", target_rank,
-                                                       datatype->is_basic() ? 1 : datatype->size(),
+                                                       datatype->is_replayable() ? 1 : datatype->size(),
                                                        encode_datatype(datatype)));
 
     retval = win->compare_and_swap(origin_addr, compare_addr, result_addr, datatype, target_rank, target_disp);

diff --git a/src/smpi/include/smpi_datatype.hpp b/src/smpi/include/smpi_datatype.hpp
index 2453f10..e96134e 100644 (file)
--- a/src/smpi/include/smpi_datatype.hpp
+++ b/src/smpi/include/smpi_datatype.hpp
@@ -103,6 +103,7 @@ public:
   void commit();
   bool is_valid();
   bool is_basic();
+  bool is_replayable();
   void addflag(int flag);
   int extent(MPI_Aint* lb, MPI_Aint* extent);
   MPI_Aint get_extent();

diff --git a/src/smpi/internals/smpi_replay.cpp b/src/smpi/internals/smpi_replay.cpp
index 8e02386..a257225 100644 (file)
--- a/src/smpi/internals/smpi_replay.cpp
+++ b/src/smpi/internals/smpi_replay.cpp
@@ -87,6 +87,8 @@ static double parse_double(const char *string)
   return value;
 }
 
+
+//TODO: this logic should be moved inside the datatype class, to support all predefined types and get rid of is_replayable.
 static MPI_Datatype decode_datatype(const char *const action)
 {
   switch(atoi(action)) {

diff --git a/src/smpi/mpi/smpi_datatype.cpp b/src/smpi/mpi/smpi_datatype.cpp
index 4237217..8da55c7 100644 (file)
--- a/src/smpi/mpi/smpi_datatype.cpp
+++ b/src/smpi/mpi/smpi_datatype.cpp
@@ -198,6 +198,12 @@ bool Datatype::is_basic()
   return (flags_ & DT_FLAG_BASIC);
 }
 
+bool Datatype::is_replayable()
+{
+  return ((this==MPI_BYTE)||(this==MPI_DOUBLE)||(this==MPI_INT)||
+          (this==MPI_CHAR)||(this==MPI_SHORT)||(this==MPI_LONG)||(this==MPI_FLOAT));
+}
+
 size_t Datatype::size(){
   return size_;
 }