X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/db17323a11a3089f492c2cae1be7913673689d5c..55a9b9fe5663cb2fe2398c14f0e9b11d4a31e3b3:/src/smpi/smpi_base.c

diff --git a/src/smpi/smpi_base.c b/src/smpi/smpi_base.c
index 88e93074d0..2d6a64bbce 100644
--- a/src/smpi/smpi_base.c
+++ b/src/smpi/smpi_base.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
+/* Copyright (c) 2007-2014. The SimGrid Team.
  * All rights reserved.                                                     */
 
 /* This program is free software; you can redistribute it and/or modify it
@@ -77,7 +77,8 @@ xbt_dynar_t smpi_ois_values = NULL;
 
 static int factor_cmp(const void *pa, const void *pb)
 {
-  return (((s_smpi_factor_t*)pa)->factor > ((s_smpi_factor_t*)pb)->factor);
+  return (((s_smpi_factor_t*)pa)->factor > ((s_smpi_factor_t*)pb)->factor) ? 1 :
+         (((s_smpi_factor_t*)pa)->factor < ((s_smpi_factor_t*)pb)->factor) ? -1 : 0;
 }
 
 
@@ -86,13 +87,14 @@ static xbt_dynar_t parse_factor(const char *smpi_coef_string)
   char *value = NULL;
   unsigned int iter = 0;
   s_smpi_factor_t fact;
+  fact.nb_values=0;
   int i=0;
   xbt_dynar_t smpi_factor, radical_elements, radical_elements2 = NULL;
 
   smpi_factor = xbt_dynar_new(sizeof(s_smpi_factor_t), NULL);
   radical_elements = xbt_str_split(smpi_coef_string, ";");
   xbt_dynar_foreach(radical_elements, iter, value) {
-    fact.nb_values=0;
+    memset(&fact, 0, sizeof(s_smpi_factor_t));
     radical_elements2 = xbt_str_split(value, ":");
     if (xbt_dynar_length(radical_elements2) <2 || xbt_dynar_length(radical_elements2) > 5)
       xbt_die("Malformed radical for smpi factor!");
@@ -129,13 +131,13 @@ static double smpi_os(double size)
   double current=0.0;
   xbt_dynar_foreach(smpi_os_values, iter, fact) {
     if (size <= fact.factor) {
-        XBT_DEBUG("os : %lf <= %ld return %f", size, fact.factor, current);
+        XBT_DEBUG("os : %f <= %ld return %f", size, fact.factor, current);
       return current;
     }else{
       current=fact.values[0]+fact.values[1]*size;
     }
   }
-  XBT_DEBUG("os : %lf > %ld return %f", size, fact.factor, current);
+  XBT_DEBUG("os : %f > %ld return %f", size, fact.factor, current);
 
   return current;
 }
@@ -151,13 +153,13 @@ static double smpi_ois(double size)
   double current=0.0;
   xbt_dynar_foreach(smpi_ois_values, iter, fact) {
     if (size <= fact.factor) {
-        XBT_DEBUG("ois : %lf <= %ld return %f", size, fact.factor, current);
+        XBT_DEBUG("ois : %f <= %ld return %f", size, fact.factor, current);
       return current;
     }else{
       current=fact.values[0]+fact.values[1]*size;
     }
   }
-  XBT_DEBUG("ois : %lf > %ld return %f", size, fact.factor, current);
+  XBT_DEBUG("ois : %f > %ld return %f", size, fact.factor, current);
 
   return current;
 }
@@ -173,12 +175,12 @@ static double smpi_or(double size)
   double current=0.0;
   xbt_dynar_foreach(smpi_or_values, iter, fact) {
     if (size <= fact.factor) {
-        XBT_DEBUG("or : %lf <= %ld return %f", size, fact.factor, current);
+        XBT_DEBUG("or : %f <= %ld return %f", size, fact.factor, current);
       return current;
     }else
       current=fact.values[0]+fact.values[1]*size;
   }
-  XBT_DEBUG("or : %lf > %ld return %f", size, fact.factor, current);
+  XBT_DEBUG("or : %f > %ld return %f", size, fact.factor, current);
 
   return current;
 }
@@ -187,7 +189,7 @@ static MPI_Request build_request(void *buf, int count,
                                  MPI_Datatype datatype, int src, int dst,
                                  int tag, MPI_Comm comm, unsigned flags)
 {
-  MPI_Request request;
+  MPI_Request request = NULL;
 
   void *old_buf = NULL;
 
@@ -219,6 +221,7 @@ static MPI_Request build_request(void *buf, int count,
   request->flags = flags;
   request->detached = 0;
   request->detached_sender = NULL;
+  request->real_src = 0;
 
   request->truncated = 0;
   request->real_size = 0;
@@ -284,9 +287,9 @@ static void smpi_mpi_request_free_voidp(void* request)
 MPI_Request smpi_mpi_send_init(void *buf, int count, MPI_Datatype datatype,
                                int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-    build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                  comm, PERSISTENT | SEND | PREPARED);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                          comm, PERSISTENT | SEND | PREPARED);
   request->refcount++;
   return request;
 }
@@ -294,9 +297,9 @@ MPI_Request smpi_mpi_send_init(void *buf, int count, MPI_Datatype datatype,
 MPI_Request smpi_mpi_ssend_init(void *buf, int count, MPI_Datatype datatype,
                                int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-    build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                  comm, PERSISTENT | SSEND | SEND | PREPARED);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                          comm, PERSISTENT | SSEND | SEND | PREPARED);
   request->refcount++;
   return request;
 }
@@ -304,9 +307,9 @@ MPI_Request smpi_mpi_ssend_init(void *buf, int count, MPI_Datatype datatype,
 MPI_Request smpi_mpi_recv_init(void *buf, int count, MPI_Datatype datatype,
                                int src, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-    build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
-                  comm, PERSISTENT | RECV | PREPARED);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
+                          comm, PERSISTENT | RECV | PREPARED);
   request->refcount++;
   return request;
 }
@@ -315,11 +318,11 @@ void smpi_mpi_start(MPI_Request request)
 {
   smx_rdv_t mailbox;
 
-  xbt_assert(!request->action,
-             "Cannot (re)start a non-finished communication");
-  if(request->flags & PREPARED)request->flags &= ~PREPARED;
-  if(request->flags & RECV) {
+  xbt_assert(!request->action, "Cannot (re)start a non-finished communication");
+  request->flags &= ~PREPARED;
+  if (request->flags & RECV) {
     print_request("New recv", request);
+    //FIXME: if receive is posted with a large size, but send is smaller, mailboxes may not match !
     if (request->size < sg_cfg_get_int("smpi/async_small_thres"))
       mailbox = smpi_process_mailbox_small();
     else
@@ -328,13 +331,15 @@ void smpi_mpi_start(MPI_Request request)
     request->real_size=request->size;
     smpi_datatype_use(request->old_type);
     smpi_comm_use(request->comm);
-    request->action = simcall_comm_irecv(mailbox, request->buf, &request->real_size, &match_recv, request);
+    request->action = simcall_comm_irecv(mailbox, request->buf,
+                                         &request->real_size, &match_recv,
+                                         request, -1.0);
 
     //integrate pseudo-timing for buffering of small messages, do not bother to execute the simcall if 0
     double sleeptime = request->detached ? smpi_or(request->size) : 0.0;
     if(sleeptime!=0.0){
         simcall_process_sleep(sleeptime);
-        XBT_DEBUG("receiving size of %zu : sleep %lf ", request->size, smpi_or(request->size));
+        XBT_DEBUG("receiving size of %zu : sleep %f ", request->size, smpi_or(request->size));
     }
 
   } else {
@@ -345,7 +350,7 @@ void smpi_mpi_start(MPI_Request request)
     #ifdef HAVE_TRACING
       int rank = smpi_process_index();
       if (TRACE_smpi_view_internals()) {
-        TRACE_smpi_send(rank, rank, receiver);
+        TRACE_smpi_send(rank, rank, receiver,request->size);
       }
     #endif
 /*    if(receiver == MPI_UNDEFINED) {*/
@@ -387,7 +392,7 @@ void smpi_mpi_start(MPI_Request request)
 
     if(sleeptime!=0.0){
         simcall_process_sleep(sleeptime);
-        XBT_DEBUG("sending size of %zu : sleep %lf ", request->size, smpi_os(request->size));
+        XBT_DEBUG("sending size of %zu : sleep %f ", request->size, smpi_os(request->size));
     }
 
     request->action =
@@ -413,6 +418,7 @@ void smpi_mpi_start(MPI_Request request)
 void smpi_mpi_startall(int count, MPI_Request * requests)
 {
   int i;
+  if(requests==NULL) return;
 
   for(i = 0; i < count; i++) {
     smpi_mpi_start(requests[i]);
@@ -441,20 +447,18 @@ void smpi_mpi_request_free(MPI_Request * request)
 MPI_Request smpi_isend_init(void *buf, int count, MPI_Datatype datatype,
                             int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-    build_request(buf==MPI_BOTTOM ? (void*)0 : buf , count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                  comm, NON_PERSISTENT | SEND | PREPARED);
-
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf , count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                          comm, NON_PERSISTENT | ISEND | SEND | PREPARED);
   return request;
 }
 
 MPI_Request smpi_mpi_isend(void *buf, int count, MPI_Datatype datatype,
                            int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-      build_request(buf==MPI_BOTTOM?(void*)0:buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                    comm, NON_PERSISTENT | ISEND | SEND);
-
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request =  build_request(buf==MPI_BOTTOM?(void*)0:buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                           comm, NON_PERSISTENT | ISEND | SEND);
   smpi_mpi_start(request);
   return request;
 }
@@ -462,9 +466,9 @@ MPI_Request smpi_mpi_isend(void *buf, int count, MPI_Datatype datatype,
 MPI_Request smpi_mpi_issend(void *buf, int count, MPI_Datatype datatype,
                            int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-      build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                    comm, NON_PERSISTENT | ISEND | SSEND | SEND);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                          comm, NON_PERSISTENT | ISEND | SSEND | SEND);
   smpi_mpi_start(request);
   return request;
 }
@@ -474,19 +478,18 @@ MPI_Request smpi_mpi_issend(void *buf, int count, MPI_Datatype datatype,
 MPI_Request smpi_irecv_init(void *buf, int count, MPI_Datatype datatype,
                             int src, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-    build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
-                  comm, NON_PERSISTENT | RECV | PREPARED);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
+                          comm, NON_PERSISTENT | RECV | PREPARED);
   return request;
 }
 
 MPI_Request smpi_mpi_irecv(void *buf, int count, MPI_Datatype datatype,
                            int src, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-      build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
-                    comm, NON_PERSISTENT | RECV);
-
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, src == MPI_ANY_SOURCE ? MPI_ANY_SOURCE : smpi_group_index(smpi_comm_group(comm), src), smpi_process_index(), tag,
+                          comm, NON_PERSISTENT | RECV);
   smpi_mpi_start(request);
   return request;
 }
@@ -494,9 +497,10 @@ MPI_Request smpi_mpi_irecv(void *buf, int count, MPI_Datatype datatype,
 void smpi_mpi_recv(void *buf, int count, MPI_Datatype datatype, int src,
                    int tag, MPI_Comm comm, MPI_Status * status)
 {
-  MPI_Request request;
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
   request = smpi_mpi_irecv(buf, count, datatype, src, tag, comm);
   smpi_mpi_wait(&request, status);
+  request = NULL;
 }
 
 
@@ -504,23 +508,25 @@ void smpi_mpi_recv(void *buf, int count, MPI_Datatype datatype, int src,
 void smpi_mpi_send(void *buf, int count, MPI_Datatype datatype, int dst,
                    int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-      build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                    comm, NON_PERSISTENT | SEND);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                          comm, NON_PERSISTENT | SEND);
+
   smpi_mpi_start(request);
   smpi_mpi_wait(&request, MPI_STATUS_IGNORE);
-
+  request = NULL;
 }
 
 void smpi_mpi_ssend(void *buf, int count, MPI_Datatype datatype,
                            int dst, int tag, MPI_Comm comm)
 {
-  MPI_Request request =
-      build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
-                    comm, NON_PERSISTENT | SSEND | SEND);
+  MPI_Request request = NULL; /* MC needs the comm to be set to NULL during the call */
+  request = build_request(buf==MPI_BOTTOM ? (void*)0 : buf, count, datatype, smpi_process_index(), smpi_group_index(smpi_comm_group(comm), dst), tag,
+                comm, NON_PERSISTENT | SSEND | SEND);
 
   smpi_mpi_start(request);
   smpi_mpi_wait(&request, MPI_STATUS_IGNORE);
+  request = NULL;
 }
 
 void smpi_mpi_sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
@@ -556,11 +562,10 @@ int smpi_mpi_get_count(MPI_Status * status, MPI_Datatype datatype)
 static void finish_wait(MPI_Request * request, MPI_Status * status)
 {
   MPI_Request req = *request;
-  if(status != MPI_STATUS_IGNORE)
-    smpi_empty_status(status);
+  smpi_empty_status(status);
 
   if(!(req->detached && req->flags & SEND) && !(req->flags & PREPARED)){
-     if(status != MPI_STATUS_IGNORE) {
+    if(status != MPI_STATUS_IGNORE) {
       int src = req->src == MPI_ANY_SOURCE ? req->real_src : req->src;
       status->MPI_SOURCE = smpi_group_rank(smpi_comm_group(req->comm), src);
       status->MPI_TAG = req->tag == MPI_ANY_TAG ? req->real_tag : req->tag;
@@ -575,8 +580,8 @@ static void finish_wait(MPI_Request * request, MPI_Status * status)
     MPI_Datatype datatype = req->old_type;
 
     if(datatype->has_subtype == 1){
-        // This part handles the problem of non-contignous memory
-        // the unserialization at the reception
+      // This part handles the problem of non-contignous memory
+      // the unserialization at the reception
       s_smpi_subtype_t *subtype = datatype->substruct;
       if(req->flags & RECV) {
         subtype->unserialize(req->buf, req->old_buf, req->real_size/smpi_datatype_size(datatype) , datatype->substruct);
@@ -589,13 +594,13 @@ static void finish_wait(MPI_Request * request, MPI_Status * status)
   }
 
 #ifdef HAVE_TRACING
-    if (TRACE_smpi_view_internals()) {
-      if(req->flags & RECV){
-        int rank = smpi_process_index();
-        int src_traced = (req->src == MPI_ANY_SOURCE ? req->real_src : req->src);
-        TRACE_smpi_recv(rank, src_traced, rank);
-      }
+  if (TRACE_smpi_view_internals()) {
+    if(req->flags & RECV){
+      int rank = smpi_process_index();
+      int src_traced = (req->src == MPI_ANY_SOURCE ? req->real_src : req->src);
+      TRACE_smpi_recv(rank, src_traced, rank);
     }
+  }
 #endif
 
   if(req->detached_sender!=NULL){
@@ -613,15 +618,15 @@ int smpi_mpi_test(MPI_Request * request, MPI_Status * status) {
   int flag;
 
   //assume that request is not MPI_REQUEST_NULL (filtered in PMPI_Test or smpi_mpi_testall before)
-  if ((*request)->action == NULL)
-    flag = 1;
-  else
-    flag = simcall_comm_test((*request)->action);
-  if(flag) {
-    finish_wait(request, status);
-    request=MPI_REQUEST_NULL;
-  }else{
-    smpi_empty_status(status);
+  smpi_empty_status(status);
+  flag = 1;
+  if (!((*request)->flags & PREPARED)) {
+    if ((*request)->action != NULL)
+      flag = simcall_comm_test((*request)->action);
+    if (flag) {
+      finish_wait(request, status);
+      *request = MPI_REQUEST_NULL;
+    }
   }
   return flag;
 }
@@ -639,7 +644,8 @@ int smpi_mpi_testany(int count, MPI_Request requests[], int *index,
   map = xbt_new(int, count);
   size = 0;
   for(i = 0; i < count; i++) {
-    if((requests[i]!=MPI_REQUEST_NULL) && requests[i]->action) {
+    if ((requests[i] != MPI_REQUEST_NULL) && requests[i]->action &&
+        !(requests[i]->flags & PREPARED)) {
        xbt_dynar_push(comms, &requests[i]->action);
        map[size] = i;
        size++;
@@ -651,6 +657,7 @@ int smpi_mpi_testany(int count, MPI_Request requests[], int *index,
     if(i != -1) {
       *index = map[i];
       finish_wait(&requests[*index], status);
+      requests[*index] = MPI_REQUEST_NULL;
       flag = 1;
     }
   }else{
@@ -673,9 +680,11 @@ int smpi_mpi_testall(int count, MPI_Request requests[],
   int flag=1;
   int i;
   for(i=0; i<count; i++){
-    if(requests[i]!= MPI_REQUEST_NULL){
+    if (requests[i] != MPI_REQUEST_NULL && !(requests[i]->flags & PREPARED)) {
       if (smpi_mpi_test(&requests[i], pstat)!=1){
         flag=0;
+      }else{
+          requests[i]=MPI_REQUEST_NULL;
       }
     }else{
       smpi_empty_status(pstat);
@@ -748,11 +757,21 @@ void smpi_mpi_iprobe(int source, int tag, MPI_Comm comm, int* flag, MPI_Status*
 void smpi_mpi_wait(MPI_Request * request, MPI_Status * status)
 {
   print_request("Waiting", *request);
+  if ((*request)->flags & PREPARED) {
+    smpi_empty_status(status);
+    return;
+  }
+
   if ((*request)->action != NULL) { // this is not a detached send
     simcall_comm_wait((*request)->action, -1.0);
+#ifdef HAVE_MC
+  if(MC_is_active())
+    (*request)->action->comm.dst_data = NULL; // dangling pointer : dst_data is freed with a wait, need to set it to NULL for system state comparison
+#endif
   }
-  finish_wait(request, status);
 
+  finish_wait(request, status);
+  *request = MPI_REQUEST_NULL;
   // FIXME for a detached send, finish_wait is not called:
 }
 
@@ -771,7 +790,7 @@ int smpi_mpi_waitany(int count, MPI_Request requests[],
     size = 0;
     XBT_DEBUG("Wait for one of %d", count);
     for(i = 0; i < count; i++) {
-      if(requests[i] != MPI_REQUEST_NULL) {
+      if (requests[i] != MPI_REQUEST_NULL && !(requests[i]->flags & PREPARED)) {
         if (requests[i]->action != NULL) {
           XBT_DEBUG("Waiting any %p ", requests[i]);
           xbt_dynar_push(comms, &requests[i]->action);
@@ -794,6 +813,7 @@ int smpi_mpi_waitany(int count, MPI_Request requests[],
       if (i != -1) {
         index = map[i];
         finish_wait(&requests[index], status);
+        requests[index] = MPI_REQUEST_NULL;
       }
     }
     xbt_free(map);
@@ -816,7 +836,8 @@ int smpi_mpi_waitall(int count, MPI_Request requests[],
   //tag invalid requests in the set
   if (status != MPI_STATUSES_IGNORE) {
     for (c = 0; c < count; c++) {
-      if (requests[c] == MPI_REQUEST_NULL || requests[c]->dst == MPI_PROC_NULL) {
+      if (requests[c] == MPI_REQUEST_NULL || requests[c]->dst == MPI_PROC_NULL ||
+          (requests[c]->flags & PREPARED)) {
         smpi_empty_status(&status[c]);
       } else if (requests[c]->src == MPI_PROC_NULL) {
         smpi_empty_status(&status[c]);
@@ -881,7 +902,7 @@ int smpi_mpi_testsome(int incount, MPI_Request requests[], int *indices,
   for(i = 0; i < incount; i++) {
     if((requests[i] != MPI_REQUEST_NULL)) {
       if(smpi_mpi_test(&requests[i], pstat)) {
-         indices[count] = i;
+         indices[i] = 1;
          count++;
          if(status != MPI_STATUSES_IGNORE) {
            status[i] = *pstat;