X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b9e5f3cda750dceba00cad0b026441b56c86096c..a4418a7b3dd1083e90cced2f0abd0b62a0a16120:/src/smpi/smpi_base.c

diff --git a/src/smpi/smpi_base.c b/src/smpi/smpi_base.c
index 8c018cada5..38a9b54eea 100644
--- a/src/smpi/smpi_base.c
+++ b/src/smpi/smpi_base.c
@@ -1,185 +1,1149 @@
+/* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
 #include "private.h"
+#include "xbt/virtu.h"
+#include "mc/mc.h"
+#include "xbt/replay.h"
+#include <errno.h>
+#include "simix/smx_private.h"
+#include "surf/surf.h"
+#include "simgrid/sg_config.h"
+
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_base, smpi, "Logging specific to SMPI (base)");
+
+
+static int match_recv(void* a, void* b, smx_action_t ignored) {
+   MPI_Request ref = (MPI_Request)a;
+   MPI_Request req = (MPI_Request)b;
+   XBT_DEBUG("Trying to match a recv of src %d against %d, tag %d against %d",ref->src,req->src, ref->tag, req->tag);
+
+  xbt_assert(ref, "Cannot match recv against null reference");
+  xbt_assert(req, "Cannot match recv against null request");
+  if((ref->src == MPI_ANY_SOURCE || req->src == ref->src)
+    && (ref->tag == MPI_ANY_TAG || req->tag == ref->tag)){
+    //we match, we can transfer some values
+    // FIXME : move this to the copy function ?
+    if(ref->src == MPI_ANY_SOURCE)ref->real_src = req->src;
+    if(ref->tag == MPI_ANY_TAG)ref->real_tag = req->tag;
+    if(ref->real_size < req->real_size) ref->truncated = 1;
+    if(req->detached==1){
+        ref->detached_sender=req; //tie the sender to the receiver, as it is detached and has to be freed in the receiver
+    }
+    return 1;
+  }else return 0;
+}
+
+static int match_send(void* a, void* b,smx_action_t ignored) {
+   MPI_Request ref = (MPI_Request)a;
+   MPI_Request req = (MPI_Request)b;
+   XBT_DEBUG("Trying to match a send of src %d against %d, tag %d against %d",ref->src,req->src, ref->tag, req->tag);
+   xbt_assert(ref, "Cannot match send against null reference");
+   xbt_assert(req, "Cannot match send against null request");
+
+   if((req->src == MPI_ANY_SOURCE || req->src == ref->src)
+             && (req->tag == MPI_ANY_TAG || req->tag == ref->tag))
+   {
+     if(req->src == MPI_ANY_SOURCE)req->real_src = ref->src;
+     if(req->tag == MPI_ANY_TAG)req->real_tag = ref->tag;
+     if(req->real_size < ref->real_size) req->truncated = 1;
+     if(ref->detached==1){
+         req->detached_sender=ref; //tie the sender to the receiver, as it is detached and has to be freed in the receiver
+     }
+
+     return 1;
+   } else return 0;
+}
+
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_base, smpi,
-                                "Logging specific to SMPI (base)");
-XBT_LOG_EXTERNAL_CATEGORY(smpi_base);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_bench);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_kernel);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_mpi);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_receiver);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_sender);
-XBT_LOG_EXTERNAL_CATEGORY(smpi_util);
+typedef struct s_smpi_factor *smpi_factor_t;
+typedef struct s_smpi_factor {
+  long factor;
+  int nb_values;
+  double values[4];//arbitrary set to 4
+} s_smpi_factor_t;
+xbt_dynar_t smpi_os_values = NULL;
+xbt_dynar_t smpi_or_values = NULL;
 
-smpi_mpi_global_t smpi_mpi_global = NULL;
 
-void smpi_mpi_land_func(void *a, void *b, int *length,
-                        MPI_Datatype * datatype);
+// Methods used to parse and store the values for timing injections in smpi
+// These are taken from surf/network.c and generalized to have more factors
+// These methods should be merged with those in surf/network.c (moved somewhere in xbt ?)
 
-void smpi_mpi_land_func(void *a, void *b, int *length,
-                        MPI_Datatype * datatype)
+static int factor_cmp(const void *pa, const void *pb)
 {
-  int i;
-  if (*datatype == smpi_mpi_global->mpi_int) {
-    int *x = a, *y = b;
-    for (i = 0; i < *length; i++) {
-      y[i] = x[i] && y[i];
+  return (((s_smpi_factor_t*)pa)->factor > ((s_smpi_factor_t*)pb)->factor);
+}
+
+
+static xbt_dynar_t parse_factor(const char *smpi_coef_string)
+{
+  char *value = NULL;
+  unsigned int iter = 0;
+  s_smpi_factor_t fact;
+  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;
+    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!");
+    for(i =0; i<xbt_dynar_length(radical_elements2);i++ ){
+        if (i==0){
+           fact.factor = atol(xbt_dynar_get_as(radical_elements2, i, char *));
+        }else{
+           fact.values[fact.nb_values] = atof(xbt_dynar_get_as(radical_elements2, i, char *));
+           fact.nb_values++;
+        }
     }
+
+    xbt_dynar_push_as(smpi_factor, s_smpi_factor_t, fact);
+    XBT_DEBUG("smpi_factor:\t%ld : %d values, first: %f", fact.factor, fact.nb_values ,fact.values[0]);
+    xbt_dynar_free(&radical_elements2);
+  }
+  xbt_dynar_free(&radical_elements);
+  iter=0;
+  xbt_dynar_sort(smpi_factor, &factor_cmp);
+  xbt_dynar_foreach(smpi_factor, iter, fact) {
+    XBT_DEBUG("smpi_factor:\t%ld : %d values, first: %f", fact.factor, fact.nb_values ,fact.values[0]);
   }
+  return smpi_factor;
 }
 
-void smpi_mpi_sum_func(void *a, void *b, int *length,
-                       MPI_Datatype * datatype);
+static double smpi_os(double size)
+{
+  if (!smpi_os_values)
+    smpi_os_values =
+        parse_factor(sg_cfg_get_string("smpi/os"));
 
-void smpi_mpi_sum_func(void *a, void *b, int *length, MPI_Datatype * datatype)
+  unsigned int iter = 0;
+  s_smpi_factor_t fact;
+  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);
+      return current;
+    }else{
+      current=fact.values[0]+fact.values[1]*size;
+    }
+  }
+  XBT_DEBUG("os : %lf > %ld return %f", size, fact.factor, current);
+
+  return current;
+}
+
+static double smpi_or(double size)
 {
-  int i;
-  if (*datatype == smpi_mpi_global->mpi_int) {
-    int *x = a, *y = b;
-    for (i = 0; i < *length; i++) {
-      y[i] = x[i] + y[i];
+  if (!smpi_or_values)
+    smpi_or_values =
+        parse_factor(sg_cfg_get_string("smpi/or"));
+
+  unsigned int iter = 0;
+  s_smpi_factor_t fact;
+  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);
+      return current;
+    }else
+      current=fact.values[0]+fact.values[1]*size;
+  }
+  XBT_DEBUG("or : %lf > %ld return %f", size, fact.factor, current);
+
+  return current;
+}
+
+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;
+
+  void *old_buf = NULL;
+
+  request = xbt_new(s_smpi_mpi_request_t, 1);
+
+  s_smpi_subtype_t *subtype = datatype->substruct;
+
+  if(datatype->has_subtype == 1){
+    // This part handles the problem of non-contiguous memory
+    old_buf = buf;
+    buf = xbt_malloc(count*smpi_datatype_size(datatype));
+    if (flags & SEND) {
+      subtype->serialize(old_buf, buf, count, datatype->substruct);
     }
   }
+
+  request->buf = buf;
+  // This part handles the problem of non-contiguous memory (for the
+  // unserialisation at the reception)
+  request->old_buf = old_buf;
+  request->old_type = datatype;
+
+  request->size = smpi_datatype_size(datatype) * count;
+  request->src = src;
+  request->dst = dst;
+  request->tag = tag;
+  request->comm = comm;
+  request->action = NULL;
+  request->flags = flags;
+  request->detached = 0;
+  request->detached_sender = NULL;
+
+  request->truncated = 0;
+  request->real_size = 0;
+  request->real_tag = 0;
+
+  request->refcount=1;
+#ifdef HAVE_TRACING
+  request->send = 0;
+  request->recv = 0;
+#endif
+  if (flags & SEND) smpi_datatype_unuse(datatype);
+
+  return request;
+}
+
+
+void smpi_empty_status(MPI_Status * status) {
+  if(status != MPI_STATUS_IGNORE) {
+      status->MPI_SOURCE=MPI_ANY_SOURCE;
+      status->MPI_TAG=MPI_ANY_TAG;
+      status->count=0;
+  }
 }
 
-int smpi_mpi_comm_rank(smpi_mpi_communicator_t comm)
+void smpi_action_trace_run(char *path)
 {
-  return comm->index_to_rank_map[smpi_host_index()];
+  char *name;
+  xbt_dynar_t todo;
+  xbt_dict_cursor_t cursor;
+
+  action_fp=NULL;
+  if (path) {
+    action_fp = fopen(path, "r");
+    xbt_assert(action_fp != NULL, "Cannot open %s: %s", path,
+               strerror(errno));
+  }
+
+  if (!xbt_dict_is_empty(action_queues)) {
+    XBT_WARN
+      ("Not all actions got consumed. If the simulation ended successfully (without deadlock), you may want to add new processes to your deployment file.");
+
+
+    xbt_dict_foreach(action_queues, cursor, name, todo) {
+      XBT_WARN("Still %lu actions for %s", xbt_dynar_length(todo), name);
+    }
+  }
+
+  if (path)
+    fclose(action_fp);
+  xbt_dict_free(&action_queues);
+  action_queues = xbt_dict_new_homogeneous(NULL);
 }
 
-void smpi_process_init()
+static void smpi_mpi_request_free_voidp(void* request)
 {
-  smx_host_t host;
-  int i;
-  smpi_host_data_t hdata;
+  MPI_Request req = request;
+  smpi_mpi_request_free(&req);
+}
 
-  smpi_global->running_hosts_count++;
+/* MPI Low level calls */
+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, count, datatype, smpi_comm_rank(comm), dst, tag,
+                  comm, PERSISTENT | SEND);
+  request->refcount++;
+  return request;
+}
 
-  // initialize some local variables
-  host = SIMIX_host_self();
+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, count, datatype, src, smpi_comm_rank(comm), tag,
+                  comm, PERSISTENT | RECV);
+  request->refcount++;
+  return request;
+}
 
-  hdata = xbt_new(s_smpi_host_data_t, 1);
+void smpi_mpi_start(MPI_Request request)
+{
+  smx_rdv_t mailbox;
 
-  for (i = 0; i < smpi_global->host_count && host != smpi_global->hosts[i]; i++);
+  xbt_assert(!request->action,
+             "Cannot (re)start a non-finished communication");
+  if(request->flags & RECV) {
+    print_request("New recv", request);
+    if (request->size < sg_cfg_get_int("smpi/async_small_thres"))
+      mailbox = smpi_process_mailbox_small();
+    else
+      mailbox = smpi_process_mailbox();
+    // we make a copy here, as the size is modified by simix, and we may reuse the request in another receive later
+    request->real_size=request->size;
+    smpi_datatype_use(request->old_type);
+    request->action = simcall_comm_irecv(mailbox, request->buf, &request->real_size, &match_recv, request);
 
-  hdata->index = i;
-  hdata->mutex = SIMIX_mutex_init();
-  hdata->cond = SIMIX_cond_init();
+    double sleeptime = smpi_or(request->size);
+    if(sleeptime!=0.0){
+        simcall_process_sleep(sleeptime);
+        XBT_DEBUG("receiving size of %zu : sleep %lf ", request->size, smpi_or(request->size));
+    }
 
-  SIMIX_host_set_data(host, hdata);
+  } else {
+
+    int receiver = smpi_group_index(smpi_comm_group(request->comm), request->dst);
+/*    if(receiver == MPI_UNDEFINED) {*/
+/*      XBT_WARN("Trying to send a message to a wrong rank");*/
+/*      return;*/
+/*    }*/
+    print_request("New send", request);
+    if (request->size < sg_cfg_get_int("smpi/async_small_thres")) { // eager mode
+      mailbox = smpi_process_remote_mailbox_small(receiver);
+    }else{
+      XBT_DEBUG("Send request %p is not in the permanent receive mailbox (buf: %p)",request,request->buf);
+      mailbox = smpi_process_remote_mailbox(receiver);
+    }
+    if (request->size < 64*1024 ) { //(FIXME: this limit should be configurable)
+      void *oldbuf = NULL;
+      request->detached = 1;
+      request->refcount++;
+      if(request->old_type->has_subtype == 0){
+        oldbuf = request->buf;
+        if (oldbuf){
+          request->buf = xbt_malloc(request->size);
+          memcpy(request->buf,oldbuf,request->size);
+        }
+      }
+      XBT_DEBUG("Send request %p is detached; buf %p copied into %p",request,oldbuf,request->buf);
+    }
+    // we make a copy here, as the size is modified by simix, and we may reuse the request in another receive later
+    request->real_size=request->size;
+    smpi_datatype_use(request->old_type);
+    double sleeptime = smpi_os(request->size);
+    if(sleeptime!=0.0){
+        simcall_process_sleep(sleeptime);
+        XBT_DEBUG("sending size of %zu : sleep %lf ", request->size, smpi_os(request->size));
+    }
+    request->action =
+      simcall_comm_isend(mailbox, request->size, -1.0,
+                         request->buf, request->real_size,
+                         &match_send,
+                         &smpi_mpi_request_free_voidp, // how to free the userdata if a detached send fails
+                         request,
+                         // detach if msg size < eager/rdv switch limit
+                         request->detached);
+
+#ifdef HAVE_TRACING
+    /* FIXME: detached sends are not traceable (request->action == NULL) */
+    if (request->action)
+      simcall_set_category(request->action, TRACE_internal_smpi_get_category());
+#endif
+
+  }
 
-  return;
 }
 
-void smpi_process_finalize()
+void smpi_mpi_startall(int count, MPI_Request * requests)
 {
   int i;
 
-  i = --smpi_global->running_hosts_count;
+  for(i = 0; i < count; i++) {
+    smpi_mpi_start(requests[i]);
+  }
+}
+
+void smpi_mpi_request_free(MPI_Request * request)
+{
+
+  if((*request) != MPI_REQUEST_NULL){
+    (*request)->refcount--;
+    if((*request)->refcount<0) xbt_die("wrong refcount");
+
+    if((*request)->refcount==0){
+        xbt_free(*request);
+        *request = MPI_REQUEST_NULL;
+    }
+  }else{
+      xbt_die("freeing an already free 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, count, datatype, smpi_comm_rank(comm), dst, tag,
+                  comm, NON_PERSISTENT | SEND);
+
+  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, count, datatype, smpi_comm_rank(comm), dst, tag,
+                    comm, NON_PERSISTENT | SEND);
+
+  smpi_mpi_start(request);
+  return request;
+}
+
+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, count, datatype, src, smpi_comm_rank(comm), tag,
+                  comm, NON_PERSISTENT | RECV);
+  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, count, datatype, src, smpi_comm_rank(comm), tag,
+                    comm, NON_PERSISTENT | RECV);
+
+  smpi_mpi_start(request);
+  return request;
+}
+
+void smpi_mpi_recv(void *buf, int count, MPI_Datatype datatype, int src,
+                   int tag, MPI_Comm comm, MPI_Status * status)
+{
+  MPI_Request request;
+  request = smpi_mpi_irecv(buf, count, datatype, src, tag, comm);
+  smpi_mpi_wait(&request, status);
+}
+
+
+
+void smpi_mpi_send(void *buf, int count, MPI_Datatype datatype, int dst,
+                   int tag, MPI_Comm comm)
+{
+  MPI_Request request;
+  request = smpi_mpi_isend(buf, count, datatype, dst, tag, comm);
+  smpi_mpi_wait(&request, MPI_STATUS_IGNORE);
+
+}
+
+void smpi_mpi_sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
+                       int dst, int sendtag, void *recvbuf, int recvcount,
+                       MPI_Datatype recvtype, int src, int recvtag,
+                       MPI_Comm comm, MPI_Status * status)
+{
+  MPI_Request requests[2];
+  MPI_Status stats[2];
+
+  requests[0] =
+    smpi_isend_init(sendbuf, sendcount, sendtype, dst, sendtag, comm);
+  requests[1] =
+    smpi_irecv_init(recvbuf, recvcount, recvtype, src, recvtag, comm);
+  smpi_mpi_startall(2, requests);
+  smpi_mpi_waitall(2, requests, stats);
+  if(status != MPI_STATUS_IGNORE) {
+    // Copy receive status
+    memcpy(status, &stats[1], sizeof(MPI_Status));
+  }
+}
+
+int smpi_mpi_get_count(MPI_Status * status, MPI_Datatype datatype)
+{
+  return status->count / smpi_datatype_size(datatype);
+}
+
+static void finish_wait(MPI_Request * request, MPI_Status * status)
+{
+  MPI_Request req = *request;
+  if(!(req->detached && req->flags & SEND)){
+    if(status != MPI_STATUS_IGNORE) {
+      status->MPI_SOURCE = req->src == MPI_ANY_SOURCE ? req->real_src : req->src;
+      status->MPI_TAG = req->tag == MPI_ANY_TAG ? req->real_tag : req->tag;
+      if(req->truncated)
+      status->MPI_ERROR = MPI_ERR_TRUNCATE;
+      else status->MPI_ERROR = MPI_SUCCESS ;
+      // this handles the case were size in receive differs from size in send
+      // FIXME: really this should just contain the count of receive-type blocks,
+      // right?
+      status->count = req->real_size;
+    }
+
+    print_request("Finishing", req);
+    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
+      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);
+      }
+      if(req->detached == 0) free(req->buf);
+    }
+    smpi_datatype_unuse(datatype);
+  }
+
+  if(req->detached_sender!=NULL){
+    smpi_mpi_request_free(&(req->detached_sender));
+  }
+
+  if(req->flags & NON_PERSISTENT) {
+    smpi_mpi_request_free(request);
+  } else {
+    req->action = NULL;
+  }
+}
+
+int smpi_mpi_test(MPI_Request * request, MPI_Status * status) {
+  int flag;
 
-  SIMIX_mutex_destroy(smpi_host_mutex());
-  SIMIX_cond_destroy(smpi_host_cond());
+  //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) {
+    (*request)->refcount++;
+    finish_wait(request, status);
+  }else{
+    smpi_empty_status(status);
+  }
+  return flag;
+}
 
-  if (0 >= i) {
+int smpi_mpi_testany(int count, MPI_Request requests[], int *index,
+                     MPI_Status * status)
+{
+  xbt_dynar_t comms;
+  int i, flag, size;
+  int* map;
 
-    // wake up senders/receivers
-    for (i = 0; i < smpi_global->host_count; i++) {
-      if (SIMIX_process_is_suspended(smpi_global->sender_processes[i])) {
-        SIMIX_process_resume(smpi_global->sender_processes[i]);
+  *index = MPI_UNDEFINED;
+  flag = 0;
+  if(count > 0) {
+    comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
+    map = xbt_new(int, count);
+    size = 0;
+    for(i = 0; i < count; i++) {
+      if((requests[i]!=MPI_REQUEST_NULL) && requests[i]->action) {
+         xbt_dynar_push(comms, &requests[i]->action);
+         map[size] = i;
+         size++;
       }
-      if (SIMIX_process_is_suspended(smpi_global->receiver_processes[i])) {
-        SIMIX_process_resume(smpi_global->receiver_processes[i]);
+    }
+    if(size > 0) {
+      i = simcall_comm_testany(comms);
+      // not MPI_UNDEFINED, as this is a simix return code
+      if(i != -1) {
+        *index = map[i];
+        finish_wait(&requests[*index], status);
+        flag = 1;
       }
+    }else{
+        //all requests are null or inactive, return true
+        flag=1;
+        smpi_empty_status(status);
     }
+    xbt_free(map);
+    xbt_dynar_free(&comms);
+  }
 
-    SIMIX_mutex_destroy(smpi_mpi_global->mpi_comm_world->barrier_mutex);
-    SIMIX_cond_destroy(smpi_mpi_global->mpi_comm_world->barrier_cond);
-    xbt_free(smpi_mpi_global->mpi_comm_world);
+  return flag;
+}
 
-    xbt_free(smpi_mpi_global->mpi_byte);
-    xbt_free(smpi_mpi_global->mpi_int);
-    xbt_free(smpi_mpi_global->mpi_double);
 
-    xbt_free(smpi_mpi_global->mpi_land);
-    xbt_free(smpi_mpi_global->mpi_sum);
+int smpi_mpi_testall(int count, MPI_Request requests[],
+                     MPI_Status status[])
+{
+  MPI_Status stat;
+  MPI_Status *pstat = status == MPI_STATUSES_IGNORE ? MPI_STATUS_IGNORE : &stat;
+  int flag=1;
+  int i;
+  for(i=0; i<count; i++){
+    if(requests[i]!= MPI_REQUEST_NULL){
+      if (smpi_mpi_test(&requests[i], pstat)!=1){
+        flag=0;
+      }
+    }else{
+      smpi_empty_status(pstat);
+    }
+    if(status != MPI_STATUSES_IGNORE) {
+      memcpy(&status[i], pstat, sizeof(*pstat));
+    }
+  }
+  return flag;
+}
 
-    xbt_free(smpi_mpi_global);
+void smpi_mpi_probe(int source, int tag, MPI_Comm comm, MPI_Status* status){
+  int flag=0;
+  //FIXME find another wait to avoid busy waiting ?
+  // the issue here is that we have to wait on a nonexistent comm
+  while(flag==0){
+    smpi_mpi_iprobe(source, tag, comm, &flag, status);
+    XBT_DEBUG("Busy Waiting on probing : %d", flag);
+    if(!flag) {
+      simcall_process_sleep(0.0001);
+    }
+  }
+}
+
+void smpi_mpi_iprobe(int source, int tag, MPI_Comm comm, int* flag, MPI_Status* status){
+  MPI_Request request =build_request(NULL, 0, MPI_CHAR, source, smpi_comm_rank(comm), tag,
+            comm, NON_PERSISTENT | RECV);
 
+  // behave like a receive, but don't do it
+  smx_rdv_t mailbox;
+
+  print_request("New iprobe", request);
+  // We have to test both mailboxes as we don't know if we will receive one one or another
+    if (sg_cfg_get_int("smpi/async_small_thres")>0){
+        mailbox = smpi_process_mailbox_small();
+        XBT_DEBUG("trying to probe the perm recv mailbox");
+        request->action = simcall_comm_iprobe(mailbox, request->src, request->tag, &match_recv, (void*)request);
+    }
+    if (request->action==NULL){
+	mailbox = smpi_process_mailbox();
+        XBT_DEBUG("trying to probe the other mailbox");
+        request->action = simcall_comm_iprobe(mailbox, request->src, request->tag, &match_recv, (void*)request);
+    }
+
+  if(request->action){
+    MPI_Request req = (MPI_Request)SIMIX_comm_get_src_data(request->action);
+    *flag = 1;
+    if(status != MPI_STATUS_IGNORE) {
+      status->MPI_SOURCE = req->src;
+      status->MPI_TAG = req->tag;
+      status->MPI_ERROR = MPI_SUCCESS;
+      status->count = req->real_size;
+    }
+  }
+  else *flag = 0;
+  smpi_mpi_request_free(&request);
+
+  return;
+}
+
+void smpi_mpi_wait(MPI_Request * request, MPI_Status * status)
+{
+  print_request("Waiting", *request);
+  if ((*request)->action != NULL) { // this is not a detached send
+    simcall_comm_wait((*request)->action, -1.0);
   }
+  finish_wait(request, status);
 
+  // FIXME for a detached send, finish_wait is not called:
 }
 
-int smpi_mpi_barrier(smpi_mpi_communicator_t comm)
+int smpi_mpi_waitany(int count, MPI_Request requests[],
+                     MPI_Status * status)
 {
+  xbt_dynar_t comms;
+  int i, size, index;
+  int *map;
+
+  index = MPI_UNDEFINED;
+  if(count > 0) {
+    // Wait for a request to complete
+    comms = xbt_dynar_new(sizeof(smx_action_t), NULL);
+    map = xbt_new(int, count);
+    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]->action != NULL) {
+          XBT_DEBUG("Waiting any %p ", requests[i]);
+          xbt_dynar_push(comms, &requests[i]->action);
+          map[size] = i;
+          size++;
+        }else{
+         //This is a finished detached request, let's return this one
+         size=0;//so we free the dynar but don't do the waitany call
+         index=i;
+         finish_wait(&requests[i], status);//cleanup if refcount = 0
+         requests[i]=MPI_REQUEST_NULL;//set to null
+         break;
+         }
+      }
+    }
+    if(size > 0) {
+      i = simcall_comm_waitany(comms);
+
+      // not MPI_UNDEFINED, as this is a simix return code
+      if (i != -1) {
+        index = map[i];
+        finish_wait(&requests[index], status);
+      }
+    }
+    xbt_free(map);
+    xbt_dynar_free(&comms);
+  }
+
+  if (index==MPI_UNDEFINED)
+    smpi_empty_status(status);
 
-  SIMIX_mutex_lock(comm->barrier_mutex);
-  ++comm->barrier_count;
-  if (comm->barrier_count > comm->size) {       // only happens on second barrier...
-    comm->barrier_count = 0;
-  } else if (comm->barrier_count == comm->size) {
-    SIMIX_cond_broadcast(comm->barrier_cond);
+  return index;
+}
+
+int smpi_mpi_waitall(int count, MPI_Request requests[],
+                      MPI_Status status[])
+{
+  int  index, c;
+  MPI_Status stat;
+  MPI_Status *pstat = status == MPI_STATUSES_IGNORE ? MPI_STATUS_IGNORE : &stat;
+  int retvalue=MPI_SUCCESS;
+  //tag invalid requests in the set
+  for(c = 0; c < count; c++) {
+    if(requests[c]==MPI_REQUEST_NULL || requests[c]->dst == MPI_PROC_NULL ){
+      if(status != MPI_STATUSES_IGNORE)
+        smpi_empty_status(&status[c]);
+    }else if(requests[c]->src == MPI_PROC_NULL ){
+      if(status != MPI_STATUSES_IGNORE) {
+        smpi_empty_status(&status[c]);
+        status[c].MPI_SOURCE=MPI_PROC_NULL;
+      }
+    }
   }
-  while (comm->barrier_count < comm->size) {
-    SIMIX_cond_wait(comm->barrier_cond, comm->barrier_mutex);
+  for(c = 0; c < count; c++) {
+      if(MC_is_active()) {
+        smpi_mpi_wait(&requests[c], pstat);
+        index = c;
+      } else {
+        index = smpi_mpi_waitany(count, requests, pstat);
+        if(index == MPI_UNDEFINED) {
+          break;
+       }
+      if(status != MPI_STATUSES_IGNORE) {
+        memcpy(&status[index], pstat, sizeof(*pstat));
+        if(status[index].MPI_ERROR==MPI_ERR_TRUNCATE)retvalue=MPI_ERR_IN_STATUS;
+
+      }
+    }
   }
-  SIMIX_mutex_unlock(comm->barrier_mutex);
 
-  return MPI_SUCCESS;
+  return retvalue;
 }
 
-int smpi_mpi_isend(smpi_mpi_request_t request)
+int smpi_mpi_waitsome(int incount, MPI_Request requests[], int *indices,
+                      MPI_Status status[])
 {
-  int retval = MPI_SUCCESS;
-  int index = smpi_host_index();
+  int i, count, index;
+  MPI_Status stat;
+  MPI_Status *pstat = status == MPI_STATUSES_IGNORE ? MPI_STATUS_IGNORE : &stat;
 
-  if (NULL == request) {
-    retval = MPI_ERR_INTERN;
-  } else {
-    xbt_fifo_push(smpi_global->pending_send_request_queues[index], request);
+  count = 0;
+  for(i = 0; i < incount; i++)
+  {
+    index=smpi_mpi_waitany(incount, requests, pstat);
+    if(index!=MPI_UNDEFINED){
+      indices[count] = index;
+      count++;
+      if(status != MPI_STATUSES_IGNORE) {
+        memcpy(&status[index], pstat, sizeof(*pstat));
+      }
+    }else{
+      return MPI_UNDEFINED;
+    }
+  }
+  return count;
+}
+
+int smpi_mpi_testsome(int incount, MPI_Request requests[], int *indices,
+                      MPI_Status status[])
+{
+  int i, count, count_dead;
+  MPI_Status stat;
+  MPI_Status *pstat = status == MPI_STATUSES_IGNORE ? MPI_STATUS_IGNORE : &stat;
 
-    if (SIMIX_process_is_suspended(smpi_global->sender_processes[index])) {
-      SIMIX_process_resume(smpi_global->sender_processes[index]);
+  count = 0;
+  count_dead = 0;
+  for(i = 0; i < incount; i++) {
+    if((requests[i] != MPI_REQUEST_NULL)) {
+      if(smpi_mpi_test(&requests[i], pstat)) {
+         indices[count] = i;
+         count++;
+         if(status != MPI_STATUSES_IGNORE) {
+            memcpy(&status[i], pstat, sizeof(*pstat));
+         }
+      }
+    }else{
+      count_dead++;
     }
   }
+  if(count_dead==incount)return MPI_UNDEFINED;
+  else return count;
+}
+
+void smpi_mpi_bcast(void *buf, int count, MPI_Datatype datatype, int root,
+                    MPI_Comm comm)
+{
+  // arity=2: a binary tree, arity=4 seem to be a good setting (see P2P-MPI))
+  nary_tree_bcast(buf, count, datatype, root, comm, 4);
+}
 
-  return retval;
+void smpi_mpi_barrier(MPI_Comm comm)
+{
+  // arity=2: a binary tree, arity=4 seem to be a good setting (see P2P-MPI))
+  nary_tree_barrier(comm, 4);
 }
 
-int smpi_mpi_irecv(smpi_mpi_request_t request)
+void smpi_mpi_gather(void *sendbuf, int sendcount, MPI_Datatype sendtype,
+                     void *recvbuf, int recvcount, MPI_Datatype recvtype,
+                     int root, MPI_Comm comm)
 {
-  int retval = MPI_SUCCESS;
-  int index = smpi_host_index();
+  int system_tag = 666;
+  int rank, size, src, index;
+  MPI_Aint lb = 0, recvext = 0;
+  MPI_Request *requests;
 
-  if (NULL == request) {
-    retval = MPI_ERR_INTERN;
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  if(rank != root) {
+    // Send buffer to root
+    smpi_mpi_send(sendbuf, sendcount, sendtype, root, system_tag, comm);
   } else {
-    xbt_fifo_push(smpi_global->pending_recv_request_queues[index], request);
+    // FIXME: check for errors
+    smpi_datatype_extent(recvtype, &lb, &recvext);
+    // Local copy from root
+    smpi_datatype_copy(sendbuf, sendcount, sendtype,
+                       (char *)recvbuf + root * recvcount * recvext, recvcount, recvtype);
+    // Receive buffers from senders
+    requests = xbt_new(MPI_Request, size - 1);
+    index = 0;
+    for(src = 0; src < size; src++) {
+      if(src != root) {
+        requests[index] = smpi_irecv_init((char *)recvbuf + src * recvcount * recvext,
+                                          recvcount, recvtype,
+                                          src, system_tag, comm);
+        index++;
+      }
+    }
+    // Wait for completion of irecv's.
+    smpi_mpi_startall(size - 1, requests);
+    smpi_mpi_waitall(size - 1, requests, MPI_STATUS_IGNORE);
+    xbt_free(requests);
+  }
+}
+
+void smpi_mpi_gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
+                      void *recvbuf, int *recvcounts, int *displs,
+                      MPI_Datatype recvtype, int root, MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, src, index;
+  MPI_Aint lb = 0, recvext = 0;
+  MPI_Request *requests;
+
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  if(rank != root) {
+    // Send buffer to root
+    smpi_mpi_send(sendbuf, sendcount, sendtype, root, system_tag, comm);
+  } else {
+    // FIXME: check for errors
+    smpi_datatype_extent(recvtype, &lb, &recvext);
+    // Local copy from root
+    smpi_datatype_copy(sendbuf, sendcount, sendtype,
+                       (char *)recvbuf + displs[root] * recvext,
+                       recvcounts[root], recvtype);
+    // Receive buffers from senders
+    requests = xbt_new(MPI_Request, size - 1);
+    index = 0;
+    for(src = 0; src < size; src++) {
+      if(src != root) {
+        requests[index] =
+          smpi_irecv_init((char *)recvbuf + displs[src] * recvext,
+                          recvcounts[src], recvtype, src, system_tag, comm);
+        index++;
+      }
+    }
+    // Wait for completion of irecv's.
+    smpi_mpi_startall(size - 1, requests);
+    smpi_mpi_waitall(size - 1, requests, MPI_STATUS_IGNORE);
+    xbt_free(requests);
+  }
+}
+
+void smpi_mpi_allgather(void *sendbuf, int sendcount,
+                        MPI_Datatype sendtype, void *recvbuf,
+                        int recvcount, MPI_Datatype recvtype,
+                        MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, other, index;
+  MPI_Aint lb = 0, recvext = 0;
+  MPI_Request *requests;
 
-    if (SIMIX_process_is_suspended(smpi_global->receiver_processes[index])) {
-      SIMIX_process_resume(smpi_global->receiver_processes[index]);
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  // FIXME: check for errors
+  smpi_datatype_extent(recvtype, &lb, &recvext);
+  // Local copy from self
+  smpi_datatype_copy(sendbuf, sendcount, sendtype,
+                     (char *)recvbuf + rank * recvcount * recvext, recvcount,
+                     recvtype);
+  // Send/Recv buffers to/from others;
+  requests = xbt_new(MPI_Request, 2 * (size - 1));
+  index = 0;
+  for(other = 0; other < size; other++) {
+    if(other != rank) {
+      requests[index] =
+        smpi_isend_init(sendbuf, sendcount, sendtype, other, system_tag,
+                        comm);
+      index++;
+      requests[index] = smpi_irecv_init((char *)recvbuf + other * recvcount * recvext,
+                                        recvcount, recvtype, other,
+                                        system_tag, comm);
+      index++;
     }
   }
+  // Wait for completion of all comms.
+  smpi_mpi_startall(2 * (size - 1), requests);
+  smpi_mpi_waitall(2 * (size - 1), requests, MPI_STATUS_IGNORE);
+  xbt_free(requests);
+}
+
+void smpi_mpi_allgatherv(void *sendbuf, int sendcount,
+                         MPI_Datatype sendtype, void *recvbuf,
+                         int *recvcounts, int *displs,
+                         MPI_Datatype recvtype, MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, other, index;
+  MPI_Aint lb = 0, recvext = 0;
+  MPI_Request *requests;
 
-  return retval;
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  // FIXME: check for errors
+  smpi_datatype_extent(recvtype, &lb, &recvext);
+  // Local copy from self
+  smpi_datatype_copy(sendbuf, sendcount, sendtype,
+                     (char *)recvbuf + displs[rank] * recvext,
+                     recvcounts[rank], recvtype);
+  // Send buffers to others;
+  requests = xbt_new(MPI_Request, 2 * (size - 1));
+  index = 0;
+  for(other = 0; other < size; other++) {
+    if(other != rank) {
+      requests[index] =
+        smpi_isend_init(sendbuf, sendcount, sendtype, other, system_tag,
+                        comm);
+      index++;
+      requests[index] =
+        smpi_irecv_init((char *)recvbuf + displs[other] * recvext, recvcounts[other],
+                        recvtype, other, system_tag, comm);
+      index++;
+    }
+  }
+  // Wait for completion of all comms.
+  smpi_mpi_startall(2 * (size - 1), requests);
+  smpi_mpi_waitall(2 * (size - 1), requests, MPI_STATUS_IGNORE);
+  xbt_free(requests);
 }
 
-int smpi_mpi_wait(smpi_mpi_request_t request, smpi_mpi_status_t * status)
+void smpi_mpi_scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
+                      void *recvbuf, int recvcount, MPI_Datatype recvtype,
+                      int root, MPI_Comm comm)
 {
-  int retval = MPI_SUCCESS;
+  int system_tag = 666;
+  int rank, size, dst, index;
+  MPI_Aint lb = 0, sendext = 0;
+  MPI_Request *requests;
 
-  if (NULL == request) {
-    retval = MPI_ERR_INTERN;
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  if(rank != root) {
+    // Recv buffer from root
+    smpi_mpi_recv(recvbuf, recvcount, recvtype, root, system_tag, comm,
+                  MPI_STATUS_IGNORE);
   } else {
-    SIMIX_mutex_lock(request->mutex);
-    while (!request->completed) {
-      SIMIX_cond_wait(request->cond, request->mutex);
+    // FIXME: check for errors
+    smpi_datatype_extent(sendtype, &lb, &sendext);
+    // Local copy from root
+    smpi_datatype_copy((char *)sendbuf + root * sendcount * sendext,
+                       sendcount, sendtype, recvbuf, recvcount, recvtype);
+    // Send buffers to receivers
+    requests = xbt_new(MPI_Request, size - 1);
+    index = 0;
+    for(dst = 0; dst < size; dst++) {
+      if(dst != root) {
+        requests[index] = smpi_isend_init((char *)sendbuf + dst * sendcount * sendext,
+                                          sendcount, sendtype, dst,
+                                          system_tag, comm);
+        index++;
+      }
     }
-    if (NULL != status) {
-      status->MPI_SOURCE = request->src;
-      status->MPI_TAG = request->tag;
-      status->MPI_ERROR = MPI_SUCCESS;
+    // Wait for completion of isend's.
+    smpi_mpi_startall(size - 1, requests);
+    smpi_mpi_waitall(size - 1, requests, MPI_STATUS_IGNORE);
+    xbt_free(requests);
+  }
+}
+
+void smpi_mpi_scatterv(void *sendbuf, int *sendcounts, int *displs,
+                       MPI_Datatype sendtype, void *recvbuf, int recvcount,
+                       MPI_Datatype recvtype, int root, MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, dst, index;
+  MPI_Aint lb = 0, sendext = 0;
+  MPI_Request *requests;
+
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  if(rank != root) {
+    // Recv buffer from root
+    smpi_mpi_recv(recvbuf, recvcount, recvtype, root, system_tag, comm,
+                  MPI_STATUS_IGNORE);
+  } else {
+    // FIXME: check for errors
+    smpi_datatype_extent(sendtype, &lb, &sendext);
+    // Local copy from root
+    smpi_datatype_copy((char *)sendbuf + displs[root] * sendext, sendcounts[root],
+                       sendtype, recvbuf, recvcount, recvtype);
+    // Send buffers to receivers
+    requests = xbt_new(MPI_Request, size - 1);
+    index = 0;
+    for(dst = 0; dst < size; dst++) {
+      if(dst != root) {
+        requests[index] =
+          smpi_isend_init((char *)sendbuf + displs[dst] * sendext, sendcounts[dst],
+                          sendtype, dst, system_tag, comm);
+        index++;
+      }
+    }
+    // Wait for completion of isend's.
+    smpi_mpi_startall(size - 1, requests);
+    smpi_mpi_waitall(size - 1, requests, MPI_STATUS_IGNORE);
+    xbt_free(requests);
+  }
+}
+
+void smpi_mpi_reduce(void *sendbuf, void *recvbuf, int count,
+                     MPI_Datatype datatype, MPI_Op op, int root,
+                     MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, src, index;
+  MPI_Aint lb = 0, dataext = 0;
+  MPI_Request *requests;
+  void **tmpbufs;
+
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+  if(rank != root) {
+    // Send buffer to root
+    smpi_mpi_send(sendbuf, count, datatype, root, system_tag, comm);
+  } else {
+    // FIXME: check for errors
+    smpi_datatype_extent(datatype, &lb, &dataext);
+    // Local copy from root
+    if (sendbuf && recvbuf)
+      smpi_datatype_copy(sendbuf, count, datatype, recvbuf, count, datatype);
+    // Receive buffers from senders
+    //TODO: make a MPI_barrier here ?
+    requests = xbt_new(MPI_Request, size - 1);
+    tmpbufs = xbt_new(void *, size - 1);
+    index = 0;
+    for(src = 0; src < size; src++) {
+      if(src != root) {
+        // FIXME: possibly overkill we we have contiguous/noncontiguous data
+        //  mapping...
+        tmpbufs[index] = xbt_malloc(count * dataext);
+        requests[index] =
+          smpi_irecv_init(tmpbufs[index], count, datatype, src,
+                          system_tag, comm);
+        index++;
+      }
+    }
+    // Wait for completion of irecv's.
+    smpi_mpi_startall(size - 1, requests);
+    for(src = 0; src < size - 1; src++) {
+      index = smpi_mpi_waitany(size - 1, requests, MPI_STATUS_IGNORE);
+      XBT_DEBUG("finished waiting any request with index %d", index);
+      if(index == MPI_UNDEFINED) {
+        break;
+      }
+      if(op) /* op can be MPI_OP_NULL that does nothing */
+        smpi_op_apply(op, tmpbufs[index], recvbuf, &count, &datatype);
+    }
+    for(index = 0; index < size - 1; index++) {
+      xbt_free(tmpbufs[index]);
     }
-    SIMIX_mutex_unlock(request->mutex);
+    xbt_free(tmpbufs);
+    xbt_free(requests);
   }
+}
+
+void smpi_mpi_allreduce(void *sendbuf, void *recvbuf, int count,
+                        MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
+{
+  smpi_mpi_reduce(sendbuf, recvbuf, count, datatype, op, 0, comm);
+  smpi_mpi_bcast(recvbuf, count, datatype, 0, comm);
+}
+
+void smpi_mpi_scan(void *sendbuf, void *recvbuf, int count,
+                   MPI_Datatype datatype, MPI_Op op, MPI_Comm comm)
+{
+  int system_tag = 666;
+  int rank, size, other, index;
+  MPI_Aint lb = 0, dataext = 0;
+  MPI_Request *requests;
+  void **tmpbufs;
+
+  rank = smpi_comm_rank(comm);
+  size = smpi_comm_size(comm);
+
+  // FIXME: check for errors
+  smpi_datatype_extent(datatype, &lb, &dataext);
 
-  return retval;
+  // Local copy from self
+  smpi_datatype_copy(sendbuf, count, datatype, recvbuf, count, datatype);
+
+  // Send/Recv buffers to/from others;
+  requests = xbt_new(MPI_Request, size - 1);
+  tmpbufs = xbt_new(void *, rank);
+  index = 0;
+  for(other = 0; other < rank; other++) {
+    // FIXME: possibly overkill we we have contiguous/noncontiguous data
+    // mapping...
+    tmpbufs[index] = xbt_malloc(count * dataext);
+    requests[index] =
+      smpi_irecv_init(tmpbufs[index], count, datatype, other, system_tag,
+                      comm);
+    index++;
+  }
+  for(other = rank + 1; other < size; other++) {
+    requests[index] =
+      smpi_isend_init(sendbuf, count, datatype, other, system_tag, comm);
+    index++;
+  }
+  // Wait for completion of all comms.
+  smpi_mpi_startall(size - 1, requests);
+  for(other = 0; other < size - 1; other++) {
+    index = smpi_mpi_waitany(size - 1, requests, MPI_STATUS_IGNORE);
+    if(index == MPI_UNDEFINED) {
+      break;
+    }
+    if(index < rank) {
+      // #Request is below rank: it's a irecv
+      smpi_op_apply(op, tmpbufs[index], recvbuf, &count, &datatype);
+    }
+  }
+  for(index = 0; index < rank; index++) {
+    xbt_free(tmpbufs[index]);
+  }
+  xbt_free(tmpbufs);
+  xbt_free(requests);
 }