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

diff --git a/src/smpi/include/smpi_file.hpp b/src/smpi/include/smpi_file.hpp
index 923674705f..41c20d9c3d 100644
--- a/src/smpi/include/smpi_file.hpp
+++ b/src/smpi/include/smpi_file.hpp
@@ -1,30 +1,210 @@
-/* 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) 2010-2023. 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_errhandler.hpp"
+#include "smpi_info.hpp"
+#include  <algorithm>
+
+XBT_LOG_EXTERNAL_CATEGORY(smpi_io);
+
+namespace simgrid::smpi {
+class File : public F2C{
+  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_;
+  MPI_Errhandler errhandler_;
+  MPI_Datatype etype_;
+  MPI_Datatype filetype_;
+  std::string datarep_;
+  MPI_Offset disp_;
+  bool atomicity_;
+
+  public:
+  File(MPI_Comm comm, const char *filename, int amode, MPI_Info info);
+  File(const File&) = delete;
+  File& operator=(const File&) = delete;
+  ~File() override;
+  int size() const;
+  int get_position(MPI_Offset* offset) const;
+  int get_position_shared(MPI_Offset* offset) const;
+  int flags() const;
+  MPI_Datatype etype() const;
+  MPI_Comm comm() const;
+  std::string name() const override { return file_ ? "MPI_File: " + std::string(file_->get_path()) : "MPI_File"; }
+
+  int sync();
+  int seek(MPI_Offset offset, int whence);
+  int seek_shared(MPI_Offset offset, int whence);
+  int set_view(MPI_Offset disp, MPI_Datatype etype, MPI_Datatype filetype, const char* datarep, const Info* info);
+  int get_view(MPI_Offset* disp, MPI_Datatype* etype, MPI_Datatype* filetype, char* datarep) const;
+  MPI_Info info();
+  void set_info( MPI_Info info);
+  void set_size(int size);
+  static int read(MPI_File fh, void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int read_shared(MPI_File fh, void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int read_ordered(MPI_File fh, void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int write(MPI_File fh, void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int write_shared(MPI_File fh, const void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int write_ordered(MPI_File fh, const void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  template <int (*T)(MPI_File, void*, int, const Datatype*, MPI_Status*)>
+  int op_all(void* buf, int count, const Datatype* datatype, MPI_Status* status);
+  static int close(MPI_File *fh);
+  static int del(const char* filename, const Info* info);
+  MPI_Errhandler errhandler();
+  void set_errhandler( MPI_Errhandler errhandler);
+  void set_atomicity(bool a);
+  bool get_atomicity() const;
+  static File* f2c(int id);
+};
+
+/* 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, const Datatype*, MPI_Status*)>
+int File::op_all(void* buf, int count, const 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->get_extent(); // cheating, as we don't care about exact data location, we can skip extent
+  std::vector<MPI_Offset> min_offsets(size);
+  std::vector<MPI_Offset> max_offsets(size);
+  simgrid::smpi::colls::allgather(&min_offset, 1, MPI_OFFSET, min_offsets.data(), 1, MPI_OFFSET, comm_);
+  simgrid::smpi::colls::allgather(&max_offset, 1, MPI_OFFSET, max_offsets.data(), 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_io, "my offsets to read : %lld:%lld, global min and max %lld:%lld", min_offset, max_offset, min,
+             max);
+  if (empty == 1) {
+    if (status != MPI_STATUS_IGNORE)
+      status->count = 0;
+    return MPI_SUCCESS;
+  }
+  XBT_CDEBUG(smpi_io, "min:max : %lld:%lld, tot %lld contig %u", min, max, tot, (datatype->flags() & DT_FLAG_CONTIGUOUS));
+  if ( size==1 || (max - min == tot && (datatype->flags() & DT_FLAG_CONTIGUOUS))) {
+    // contiguous. Just have each proc perform its read
+    if (status != MPI_STATUS_IGNORE)
+      status->count = count * datatype->size();
+    int ret = T(this, buf, count, datatype, status);
+    seek(max_offset, MPI_SEEK_SET);
+    return ret;
+  }
+
+  // Interleaved case : How much do I need to read, and whom to send it ?
+  MPI_Offset my_chunk_start = min + (max - min + 1) / size * rank;
+  MPI_Offset my_chunk_end   = min + ((max - min + 1) / size * (rank + 1)) +1;
+  XBT_CDEBUG(smpi_io, "my chunks to read : %lld:%lld", my_chunk_start, my_chunk_end);
+  std::vector<int> send_sizes(size);
+  std::vector<int> recv_sizes(size);
+  std::vector<int> send_disps(size);
+  std::vector<int> recv_disps(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], my_chunk_end) - std::max(min_offsets[i], my_chunk_start));
+      //we want to send only useful data, so let's pretend we pack it
+      send_sizes[i]=send_sizes[i]/datatype->get_extent()*datatype->size();
+      // store min and max offset to actually read
+  
+      min_offset = std::min(min_offset, min_offsets[i]);
+      total_sent += send_sizes[i];
+      XBT_CDEBUG(smpi_io, "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.emplace_back(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;
+  for (unsigned i = 1; i < ranges.size(); i++) {
+    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;
+      }
+    }
+  }
+  // what do I need to read ?
+  MPI_Offset totreads = 0;
+  for (auto const& [chunk_start, chunk_end] : chunks) {
+    if (chunk_end < my_chunk_start)
+      continue;
+    else if (chunk_start > my_chunk_end)
+      continue;
+    else
+      totreads += (std::min(chunk_end, my_chunk_end) - std::max(chunk_start, my_chunk_start));
+  }
+  XBT_CDEBUG(smpi_io, "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->get_extent(), datatype, status);
+    seek(max_offset, MPI_SEEK_SET);
+  }
+  simgrid::smpi::colls::alltoall(send_sizes.data(), 1, MPI_INT, recv_sizes.data(), 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.data(), send_disps.data(), MPI_BYTE, buf, recv_sizes.data(),
+                                  recv_disps.data(), MPI_BYTE, comm_);
+  if (status != MPI_STATUS_IGNORE)
+    status->count = count * datatype->size();
+  smpi_free_tmp_buffer(sendbuf);
+  return MPI_SUCCESS;
+}
+} // namespace simgrid::smpi
+
+#endif