X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/381959205c50d615e514a291f2a8cdd35d8a5af7..a4c8f1898670317d0fa33bf1b1a904ea922b78cc:/src/smpi/include/smpi_file.hpp

diff --git a/src/smpi/include/smpi_file.hpp b/src/smpi/include/smpi_file.hpp
index 923674705f..97ef812ab9 100644
--- a/src/smpi/include/smpi_file.hpp
+++ b/src/smpi/include/smpi_file.hpp
@@ -1,30 +1,191 @@
-/* Copyright (c) 2010-2019. 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. */
-
-#ifndef SMPI_FILE_HPP_INCLUDED
-#define SMPI_FILE_HPP_INCLUDED
-#include "simgrid/plugins/file_system.h"
-
-
-namespace simgrid{
-namespace smpi{
-class File{
-  MPI_Comm comm_;
-  int flags_;
-  simgrid::s4u::File* file_;
-  MPI_Info info_;
-  public:
-  File(MPI_Comm comm, char *filename, int amode, MPI_Info info);
-  ~File();
-  int size();
-  int flags();
-  int sync();
-  static int close(MPI_File *fh);
-  static int del(char *filename, MPI_Info info);
-};
-}
-}
-#endif
\ No newline at end of file
+/* Copyright (c) 2010-2019. 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. */
+
+#ifndef SMPI_FILE_HPP_INCLUDED
+#define SMPI_FILE_HPP_INCLUDED
+#include "simgrid/plugins/file_system.h"
+#include "smpi_comm.hpp"
+#include "smpi_coll.hpp"
+#include "smpi_datatype.hpp"
+#include "smpi_info.hpp"
+#include  <algorithm>
+
+XBT_LOG_EXTERNAL_CATEGORY(smpi_pmpi);
+
+namespace simgrid{
+namespace smpi{
+class File{
+  MPI_Comm comm_;
+  int flags_;
+  simgrid::s4u::File* file_;
+  MPI_Info info_;
+  MPI_Offset* shared_file_pointer_;
+  s4u::MutexPtr shared_mutex_;
+  MPI_Win win_;
+  char* list_;
+  public:
+  File(MPI_Comm comm, const char *filename, int amode, MPI_Info info);
+  File(const File&) = delete;
+  File& operator=(const File&) = delete;
+  ~File();
+  int size();
+  int get_position(MPI_Offset* offset);
+  int get_position_shared(MPI_Offset* offset);
+  int flags();
+  MPI_Comm comm();
+  int sync();
+  int seek(MPI_Offset offset, int whence);
+  int seek_shared(MPI_Offset offset, int whence);
+  MPI_Info info();
+  void set_info( MPI_Info info);
+  static int read(MPI_File fh, void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int read_shared(MPI_File fh, void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int read_ordered(MPI_File fh, void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int write(MPI_File fh, void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int write_shared(MPI_File fh, const void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int write_ordered(MPI_File fh, const void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  template <int (*T)(MPI_File, void *, int, MPI_Datatype, MPI_Status *)> int op_all(void *buf, int count,MPI_Datatype datatype, MPI_Status *status);
+  static int close(MPI_File *fh);
+  static int del(const char *filename, MPI_Info info);
+};
+
+  /* Read_all, Write_all : loosely based on */
+  /* @article{Thakur:1996:ETM:245875.245879,*/
+  /* author = {Thakur, Rajeev and Choudhary, Alok},*/
+  /* title = {An Extended Two-phase Method for Accessing Sections of Out-of-core Arrays},*/
+  /* journal = {Sci. Program.},*/
+  /* issue_date = {Winter 1996},*/
+  /* pages = {301--317},*/
+  /* }*/ 
+  template <int (*T)(MPI_File, void *, int, MPI_Datatype, MPI_Status *)>
+  int File::op_all(void *buf, int count, MPI_Datatype datatype, MPI_Status *status){
+    //get min and max offsets from everyone.
+    int size =  comm_->size();
+    int rank = comm_-> rank();
+    MPI_Offset min_offset = file_->tell();
+    MPI_Offset max_offset = (min_offset + count * datatype->size());//cheating, as we don't care about exact data location, we can skip extent
+    MPI_Offset* min_offsets = new MPI_Offset[size];
+    MPI_Offset* max_offsets = new MPI_Offset[size];
+    simgrid::smpi::Colls::allgather(&min_offset, 1, MPI_OFFSET, min_offsets, 1, MPI_OFFSET, comm_);
+    simgrid::smpi::Colls::allgather(&max_offset, 1, MPI_OFFSET, max_offsets, 1, MPI_OFFSET, comm_);
+    MPI_Offset min=min_offset;
+    MPI_Offset max=max_offset;
+    MPI_Offset tot= 0;
+    int empty=1;
+    for(int i=0;i<size;i++){
+      if(min_offsets[i]!=max_offsets[i])
+        empty=0;
+      tot+=(max_offsets[i]-min_offsets[i]);
+      if(min_offsets[i]<min)
+        min=min_offsets[i];
+      if(max_offsets[i]>max)
+        max=max_offsets[i];
+    }
+    
+    XBT_CDEBUG(smpi_pmpi, "my offsets to read : %lld:%lld, global min and max %lld:%lld", min_offset, max_offset, min, max);
+    if(empty==1){
+      delete[] min_offsets;
+      delete[] max_offsets;
+      status->count=0;
+      return MPI_SUCCESS;
+    }
+    MPI_Offset total = max-min;
+    if(total==tot && (datatype->flags() & DT_FLAG_CONTIGUOUS)){
+      delete[] min_offsets;
+      delete[] max_offsets;
+      //contiguous. Just have each proc perform its read
+      status->count=count * datatype->size();
+      return T(this,buf,count,datatype, status);
+    }
+
+    //Interleaved case : How much do I need to read, and whom to send it ?
+    MPI_Offset my_chunk_start=(max-min+1)/size*rank;
+    MPI_Offset my_chunk_end=((max-min+1)/size*(rank+1));
+    XBT_CDEBUG(smpi_pmpi, "my chunks to read : %lld:%lld", my_chunk_start, my_chunk_end);
+    int* send_sizes = new int[size];
+    int* recv_sizes = new int[size];
+    int* send_disps = new int[size];
+    int* recv_disps = new int[size];
+    int total_sent=0;
+    for(int i=0;i<size;i++){
+      send_sizes[i]=0;
+      send_disps[i]=0;//cheat to avoid issues when send>recv as we use recv buffer
+      if((my_chunk_start>=min_offsets[i] && my_chunk_start < max_offsets[i])||
+          ((my_chunk_end<=max_offsets[i]) && my_chunk_end> min_offsets[i])){
+        send_sizes[i]=(std::min(max_offsets[i]-1, my_chunk_end-1)-std::max(min_offsets[i], my_chunk_start));
+        //store min and max offest to actually read
+        min_offset=std::min(min_offset, min_offsets[i]);
+        total_sent+=send_sizes[i];
+        XBT_CDEBUG(smpi_pmpi, "will have to send %d bytes to %d", send_sizes[i], i);
+      }
+    }
+    min_offset=std::max(min_offset, my_chunk_start);
+
+    //merge the ranges of every process
+    std::vector<std::pair<MPI_Offset, MPI_Offset>> ranges;
+    for(int i=0; i<size; ++i)
+      ranges.push_back(std::make_pair(min_offsets[i],max_offsets[i]));
+    std::sort(ranges.begin(), ranges.end());
+    std::vector<std::pair<MPI_Offset, MPI_Offset>> chunks;
+    chunks.push_back(ranges[0]);
+
+    unsigned int nchunks=0;
+    unsigned int i=1;
+    while(i < ranges.size()){
+      if(ranges[i].second>chunks[nchunks].second){
+        // else range included - ignore
+        if(ranges[i].first>chunks[nchunks].second){
+          //new disjoint range
+          chunks.push_back(ranges[i]);
+          nchunks++;
+        } else {
+          //merge ranges
+          chunks[nchunks].second=ranges[i].second;
+        }
+      }
+      i++;
+    }
+    //what do I need to read ?
+    MPI_Offset totreads=0;
+    for(i=0; i<chunks.size();i++){
+      if(chunks[i].second < my_chunk_start)
+        continue;
+      else if (chunks[i].first > my_chunk_end)
+        continue;
+      else
+        totreads += (std::min(chunks[i].second, my_chunk_end-1)-std::max(chunks[i].first, my_chunk_start));
+    }
+    XBT_CDEBUG(smpi_pmpi, "will have to access %lld from my chunk", totreads);
+
+    unsigned char* sendbuf = smpi_get_tmp_sendbuffer(total_sent);
+
+    if(totreads>0){
+      seek(min_offset, MPI_SEEK_SET);
+      T(this,sendbuf,totreads/datatype->size(),datatype, status);
+    }
+    simgrid::smpi::Colls::alltoall(send_sizes, 1, MPI_INT, recv_sizes, 1, MPI_INT, comm_);
+    int total_recv=0;
+    for(int i=0;i<size;i++){
+      recv_disps[i]=total_recv;
+      total_recv+=recv_sizes[i];
+    }
+    //Set buf value to avoid copying dumb data
+    simgrid::smpi::Colls::alltoallv(sendbuf, send_sizes, send_disps, MPI_BYTE,
+                              buf, recv_sizes, recv_disps, MPI_BYTE, comm_);
+    status->count=count * datatype->size();
+    smpi_free_tmp_buffer(sendbuf);
+    delete[] send_sizes;
+    delete[] recv_sizes;
+    delete[] send_disps;
+    delete[] recv_disps;
+    delete[] min_offsets;
+    delete[] max_offsets;
+    return MPI_SUCCESS;
+  }
+}
+}
+
+#endif