am_mpi.h

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/*
 * Copyright 2025 Argonne National Laboratory, Stanford University, NVIDIA Corporation
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#ifndef AM_MPI_H_INCLUDED
#define AM_MPI_H_INCLUDED
 
#include <cstring>
#include <cstdlib>
#include <mpi.h>
#include <cstdio>
#include <cassert>
#include "realm/atomics.h"
#include "realm/activemsg.h"
 
#define AM_BUF_COUNT 128
 
// size of posted receives (i.e. header+payload limit that can be sent
//  eagerly)
#define AM_BUF_SIZE 4096
 
#define CHECK_MPI(cmd)                                                                   \
  do {                                                                                   \
    int ret = (cmd);                                                                     \
    if(ret != MPI_SUCCESS) {                                                             \
      fprintf(stderr, "MPI: %s = %d\n", #cmd, ret);                                      \
      exit(1);                                                                           \
    }                                                                                    \
  } while(0)
 
namespace Realm {
  namespace MPI {
 
    extern atomic<size_t> messages_sent, messages_rcvd;
 
    struct AM_msg {
      int type;
      int msgid;
      int header_size;
      int payload_size;
      uintptr_t comp_ptr;
      char stuff[1];
    };
 
    int AM_Init(int *p_node_this, int *p_node_size);
    void AM_Finalize();
    void AM_init_long_messages(MPI_Win win, void *am_base,
                               Realm::IncomingMessageManager *message_manager);
    void AMPoll();
    void AMPoll_cancel();
    void AMSend(int tgt, int msgid, int header_size, int payload_size, const char *header,
                const char *payload, int payload_lines, int payload_line_stride,
                int has_dest, MPI_Aint dest, void *remote_comp);
 
    // must be defined by caller of AMSend
    void AMComplete(void *remote_comp);
 
  } /* namespace MPI */
} /* namespace Realm */
 
#endif /* AM_MPI_H_INCLUDED */