ch3u_rma_sync.c 68.9 KB
Newer Older
1
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
2 3 4 5 6 7 8 9
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpidimpl.h"
#include "mpidrma.h"

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
/* Notes for memory barriers in RMA synchronizations

   When SHM is allocated for RMA window, we need to add memory berriers at proper
   places in RMA synchronization routines to guarantee the ordering of read/write
   operations, so that any operations after synchronization calls will see the
   correct data.

   There are four kinds of operations involved in the following explanation:

   1. Local loads/stores: any operations happening outside RMA epoch and accessing
      each process's own window memory.

   2. SHM operations: any operations happening inside RMA epoch. They may access
      any processes' window memory, which include direct loads/stores, and
      RMA operations that are internally implemented as direct loads/stores in
      MPI implementation.

   3. PROC_SYNC: synchronzations among processes by sending/recving messages.

   4. MEM_SYNC: a full memory barrier. It ensures the ordering of read/write
      operations on each process.

   (1) FENCE synchronization

              RANK 0                           RANK 1

       (local loads/stores)             (local loads/stores)

           WIN_FENCE {                    WIN_FENCE {
               MEM_SYNC                       MEM_SYNC
               PROC_SYNC -------------------- PROC_SYNC
               MEM_SYNC                       MEM_SYNC
           }                              }

        (SHM operations)                  (SHM operations)

           WIN_FENCE {                     WIN_FENCE {
               MEM_SYNC                        MEM_SYNC
               PROC_SYNC --------------------- PROC_SYNC
               MEM_SYNC                        MEM_SYNC
           }                               }

      (local loads/stores)              (local loads/stores)

       We need MEM_SYNC before and after PROC_SYNC for both starting WIN_FENCE
       and ending WIN_FENCE, to ensure the ordering between local loads/stores
       and PROC_SYNC in starting WIN_FENCE (and vice versa in ending WIN_FENCE),
       and the ordering between PROC_SYNC and SHM operations in starting WIN_FENCE
       (and vice versa for ending WIN_FENCE).

       In starting WIN_FENCE, the MEM_SYNC before PROC_SYNC essentially exposes
       previous local loads/stores to other processes; after PROC_SYNC, each
       process knows that everyone else already exposed their local loads/stores;
       the MEM_SYNC after PROC_SYNC ensures that my following SHM operations will
       happen after PROC_SYNC and will see the latest data on other processes.

       In ending WIN_FENCE, the MEM_SYNC before PROC_SYNC essentially exposes
       previous SHM operations to other processes; after PROC_SYNC, each process
       knows everyone else already exposed their SHM operations; the MEM_SYNC
       after PROC_SYNC ensures that my following local loads/stores will happen
       after PROC_SYNC and will see the latest data in my memory region.

   (2) POST-START-COMPLETE-WAIT synchronization

              RANK 0                           RANK 1

                                          (local loads/stores)

           WIN_START {                      WIN_POST {
                                                MEM_SYNC
               PROC_SYNC ---------------------- PROC_SYNC
               MEM_SYNC
           }                                }

         (SHM operations)

           WIN_COMPLETE {                  WIN_WAIT/TEST {
               MEM_SYNC
               PROC_SYNC --------------------- PROC_SYNC
                                               MEM_SYNC
           }                               }

                                          (local loads/stores)

       We need MEM_SYNC before PROC_SYNC for WIN_POST and WIN_COMPLETE, and
       MEM_SYNC after PROC_SYNC in WIN_START and WIN_WAIT/TEST, to ensure the
       ordering between local loads/stores and PROC_SYNC in WIN_POST (and
       vice versa in WIN_WAIT/TEST), and the ordering between PROC_SYNC and SHM
       operations in WIN_START (and vice versa in WIN_COMPLETE).

       In WIN_POST, the MEM_SYNC before PROC_SYNC essentially exposes previous
       local loads/stores to group of origin processes; after PROC_SYNC, origin
       processes knows all target processes already exposed their local
       loads/stores; in WIN_START, the MEM_SYNC after PROC_SYNC ensures that
       following SHM operations will happen after PROC_SYNC and will see the
       latest data on target processes.

       In WIN_COMPLETE, the MEM_SYNC before PROC_SYNC essentailly exposes previous
       SHM operations to group of target processes; after PROC_SYNC, target
       processes knows all origin process already exposed their SHM operations;
       in WIN_WAIT/TEST, the MEM_SYNC after PROC_SYNC ensures that following local
       loads/stores will happen after PROC_SYNC and will see the latest data in
       my memory region.

   (3) Passive target synchronization

              RANK 0                          RANK 1

                                        WIN_LOCK(target=1) {
                                            PROC_SYNC (lock granted)
                                            MEM_SYNC
                                        }

                                        (SHM operations)

                                        WIN_UNLOCK(target=1) {
                                            MEM_SYNC
                                            PROC_SYNC (lock released)
                                        }

         PROC_SYNC -------------------- PROC_SYNC

         WIN_LOCK (target=1) {
             PROC_SYNC (lock granted)
             MEM_SYNC
         }

         (SHM operations)

         WIN_UNLOCK (target=1) {
             MEM_SYNC
             PROC_SYNC (lock released)
         }

         PROC_SYNC -------------------- PROC_SYNC

                                        WIN_LOCK(target=1) {
                                            PROC_SYNC (lock granted)
                                            MEM_SYNC
                                        }

                                        (SHM operations)

                                        WIN_UNLOCK(target=1) {
                                            MEM_SYNC
                                            PROC_SYNC (lock released)
                                        }

         We need MEM_SYNC after PROC_SYNC in WIN_LOCK, and MEM_SYNC before
         PROC_SYNC in WIN_UNLOCK, to ensure the ordering between SHM operations
         and PROC_SYNC and vice versa.

         In WIN_LOCK, the MEM_SYNC after PROC_SYNC guarantees two things:
         (a) it guarantees that following SHM operations will happen after
         lock is granted; (b) it guarantees that following SHM operations
         will happen after any PROC_SYNC with target before WIN_LOCK is called,
         which means those SHM operations will see the latest data on target
         process.

         In WIN_UNLOCK, the MEM_SYNC before PROC_SYNC also guarantees two
         things: (a) it guarantees that SHM operations will happen before
         lock is released; (b) it guarantees that SHM operations will happen
         before any PROC_SYNC with target after WIN_UNLOCK is returned, which
         means following SHM operations on that target will see the latest data.

         WIN_LOCK_ALL/UNLOCK_ALL are same with WIN_LOCK/UNLOCK.

              RANK 0                          RANK 1

         WIN_LOCK_ALL

         (SHM operations)

         WIN_FLUSH(target=1) {
             MEM_SYNC
         }

         PROC_SYNC ------------------------PROC_SYNC

                                           WIN_LOCK(target=1) {
                                               PROC_SYNC (lock granted)
                                               MEM_SYNC
                                           }

                                           (SHM operations)

                                           WIN_UNLOCK(target=1) {
                                               MEM_SYNC
                                               PROC_SYNC (lock released)
                                           }

         WIN_UNLOCK_ALL

         We need MEM_SYNC in WIN_FLUSH to ensure the ordering between SHM
         operations and PROC_SYNC.

         The MEM_SYNC in WIN_FLUSH guarantees that all SHM operations before
         this WIN_FLUSH will happen before any PROC_SYNC with target after
         this WIN_FLUSH, which means SHM operations on target process after
         PROC_SYNC with origin will see the latest data.
*/

Xin Zhao's avatar
Xin Zhao committed
212 213 214 215 216 217 218 219
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_lockqueue_alloc);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_winlock_getlocallock);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_wincreate_allgather);

MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_rmaqueue_alloc);
MPIR_T_PVAR_DOUBLE_TIMER_DECL(RMA, rma_rmaqueue_set);

void MPIDI_CH3_RMA_Init_sync_pvars(void)
220
{
Xin Zhao's avatar
Xin Zhao committed
221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
    /* rma_lockqueue_alloc */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_lockqueue_alloc,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Allocate Lock Queue element (in seconds)");

    /* rma_winlock_getlocallock */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_winlock_getlocallock,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "WIN_LOCK:Get local lock (in seconds)");

    /* rma_wincreate_allgather */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_wincreate_allgather,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "WIN_CREATE:Allgather (in seconds)");

    /* rma_rmaqueue_alloc */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_rmaqueue_alloc,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Allocate RMA Queue element (in seconds)");

    /* rma_rmaqueue_set */
    MPIR_T_PVAR_TIMER_REGISTER_STATIC(RMA,
                                      MPI_DOUBLE,
                                      rma_rmaqueue_set,
                                      MPI_T_VERBOSITY_MPIDEV_DETAIL,
                                      MPI_T_BIND_NO_OBJECT,
                                      MPIR_T_PVAR_FLAG_READONLY,
                                      "RMA", "Set fields in RMA Queue element (in seconds)");
265
}
266

267 268
/* These are used to use a common routine to complete lists of RMA
   operations with a single routine, while collecting data that
269 270 271 272
   distinguishes between different synchronization modes.  This is not
   thread-safe; the best choice for thread-safety is to eliminate this
   ability to discriminate between the different types of RMA synchronization.
*/
273

274 275 276
/*
 * These routines provide a default implementation of the MPI RMA operations
 * in terms of the low-level, two-sided channel operations.  A channel
277 278
 * may override these functions, on a per-window basis, by overriding
 * the MPID functions in the RMAFns section of MPID_Win object.
279 280
 */

281 282
#define SYNC_POST_TAG 100

283

284 285 286 287 288
/********************************************************************************/
/* Active Target synchronization (including WIN_FENCE, WIN_POST, WIN_START,     */
/* WIN_COMPLETE, WIN_WAIT, WIN_TEST)                                            */
/********************************************************************************/

289 290 291 292
#undef FUNCNAME
#define FUNCNAME MPIDI_Win_fence
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
293
int MPIDI_Win_fence(int assert, MPID_Win * win_ptr)
294
{
295 296 297
    int i, made_progress = 0;
    int local_completed = 0, remote_completed = 0;
    MPIDI_RMA_Target_t *curr_target = NULL;
Wesley Bland's avatar
Wesley Bland committed
298
    mpir_errflag_t errflag = MPIR_ERR_NONE;
299
    int progress_engine_triggered = 0;
300
    int mpi_errno = MPI_SUCCESS;
301 302 303 304
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_FENCE);

    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_FENCE);

305 306 307 308
    MPIU_ERR_CHKANDJUMP((win_ptr->states.access_state != MPIDI_RMA_NONE &&
                         win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                         win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED) ||
                        win_ptr->states.exposure_state != MPIDI_RMA_NONE,
James Dinan's avatar
James Dinan committed
309 310
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");

311 312 313 314 315
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

316 317
    if (assert & MPI_MODE_NOPRECEDE) {
        if (assert & MPI_MODE_NOSUCCEED) {
318
            goto finish_fence;
319
        }
320 321
        else {
            /* It is possible that there is a IBARRIER in MPI_WIN_FENCE with
322 323
             * MODE_NOPRECEDE not being completed, we let the progress engine
             * to delete its request when it is completed. */
324 325 326 327 328 329 330
            if (win_ptr->fence_sync_req != MPI_REQUEST_NULL) {
                MPID_Request *req_ptr;
                MPID_Request_get_ptr(win_ptr->fence_sync_req, req_ptr);
                MPID_Request_release(req_ptr);
                win_ptr->fence_sync_req = MPI_REQUEST_NULL;
                win_ptr->states.access_state = MPIDI_RMA_NONE;
            }
331

332 333
            if (win_ptr->shm_allocated == TRUE) {
                MPID_Comm *node_comm_ptr = win_ptr->comm_ptr->node_comm;
334

335
                mpi_errno = MPIR_Barrier_impl(node_comm_ptr, &errflag);
336 337
                if (mpi_errno != MPI_SUCCESS)
                    MPIU_ERR_POP(mpi_errno);
338
                MPIU_ERR_CHKANDJUMP(errflag, mpi_errno, MPI_ERR_OTHER, "**coll_fail");
339

340
                /* Mark that we triggered the progress engine
341
                 * in this function call. */
342
                progress_engine_triggered = 1;
343 344
            }

345
            mpi_errno = MPIR_Ibarrier_impl(win_ptr->comm_ptr, &(win_ptr->fence_sync_req));
346 347
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
348

349
            /* Set window access state properly. */
350 351
            win_ptr->states.access_state = MPIDI_RMA_FENCE_ISSUED;
            num_active_issued_win++;
352

353
            goto finish_fence;
354
        }
355
    }
356

357 358 359
    if (win_ptr->states.access_state == MPIDI_RMA_FENCE_ISSUED) {
        while (win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED) {
            mpi_errno = wait_progress_engine();
360 361
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
362 363

            /* Mark that we triggered the progress engine
364
             * in this function call. */
365
            progress_engine_triggered = 1;
366
        }
367
    }
368

369 370 371 372 373 374 375 376 377
    /* Set sync_flag in target structs. */
    for (i = 0; i < win_ptr->num_slots; i++) {
        curr_target = win_ptr->slots[i].target_list;
        while (curr_target != NULL) {

            /* set sync_flag in sync struct */
            if (curr_target->sync.sync_flag < MPIDI_RMA_SYNC_FLUSH) {
                curr_target->sync.sync_flag = MPIDI_RMA_SYNC_FLUSH;
                curr_target->sync.outstanding_acks++;
378
            }
379
            curr_target = curr_target->next;
380
        }
381
    }
382

383 384
    /* Issue out all operations. */
    mpi_errno = MPIDI_CH3I_RMA_Make_progress_win(win_ptr, &made_progress);
385 386
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
387 388 389

    /* Wait for remote completion. */
    do {
390 391 392
        mpi_errno = MPIDI_CH3I_RMA_Cleanup_ops_win(win_ptr, &local_completed, &remote_completed);
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
393 394 395 396
        if (!remote_completed) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
397 398

            /* Mark that we triggered the progress engine
399
             * in this function call. */
400
            progress_engine_triggered = 1;
401
        }
402
    } while (!remote_completed);
403

404 405
    /* Cleanup all targets on window. */
    mpi_errno = MPIDI_CH3I_RMA_Cleanup_targets_win(win_ptr);
406 407
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
James Dinan's avatar
James Dinan committed
408

409
    mpi_errno = MPIR_Barrier_impl(win_ptr->comm_ptr, &errflag);
410 411
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
412
    MPIU_ERR_CHKANDJUMP(errflag, mpi_errno, MPI_ERR_OTHER, "**coll_fail");
413

414
    /* Mark that we triggered the progress engine
415
     * in this function call. */
416 417
    progress_engine_triggered = 1;

418
    /* Set window access state properly. */
419 420 421 422 423
    if (assert & MPI_MODE_NOSUCCEED) {
        win_ptr->states.access_state = MPIDI_RMA_NONE;
    }
    else {
        win_ptr->states.access_state = MPIDI_RMA_FENCE_GRANTED;
424 425
    }

426
  finish_fence:
427 428 429
    /* Make sure that all targets are freed. */
    MPIU_Assert(win_ptr->non_empty_slots == 0);

430 431 432 433 434 435 436 437 438
    if (assert & MPI_MODE_NOPRECEDE) {
        /* BEGINNING synchronization: the following counter should be zero. */
        MPIU_Assert(win_ptr->accumulated_ops_cnt == 0);
    }
    else {
        /* ENDING synchronization: correctly decrement the following counter. */
        win_ptr->accumulated_ops_cnt = 0;
    }

439 440
    MPIU_Assert(win_ptr->active_req_cnt == 0);

441 442 443
    if (!(assert & MPI_MODE_NOPRECEDE)) {
        if (!progress_engine_triggered) {
            /* In some cases (e.g. target is myself, or process on SHM),
444 445 446 447 448 449
             * this function call does not go through the progress engine.
             * Therefore, it is possible that this process never process
             * events coming from other processes. This may cause deadlock in
             * applications where the program execution on this process depends
             * on the happening of events from other processes. Here we poke
             * the progress engine once to avoid such issue.  */
450 451 452 453 454 455
            mpi_errno = poke_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
        }
    }

456 457 458 459 460
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

461
  fn_exit:
462 463 464
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_FENCE);
    return mpi_errno;
    /* --BEGIN ERROR HANDLING-- */
465
  fn_fail:
466 467 468 469 470 471
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}


#undef FUNCNAME
472
#define FUNCNAME MPIDI_Win_post
473 474
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
475
int MPIDI_Win_post(MPID_Group * post_grp_ptr, int assert, MPID_Win * win_ptr)
476
{
477
    int *post_ranks_in_win_grp;
478
    int mpi_errno = MPI_SUCCESS;
479
    MPIU_CHKLMEM_DECL(3);
480
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_POST);
481

482
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_POST);
483

484
    /* Note that here we cannot distinguish if this exposure epoch is overlapped
485 486 487
     * with an exposure epoch of FENCE (which is not allowed), since FENCE may be
     * ended up with not unsetting the window state. We can only detect if this
     * exposure epoch is overlapped with another exposure epoch of PSCW. */
488
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_NONE,
489
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
490

491 492 493
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
494 495
    }

496
    /* Set window exposure state properly. */
497 498 499 500
    win_ptr->states.exposure_state = MPIDI_RMA_PSCW_EXPO;

    win_ptr->at_completion_counter += post_grp_ptr->size;

501 502 503
    if ((assert & MPI_MODE_NOCHECK) == 0) {
        MPI_Request *req;
        MPI_Status *status;
504 505
        int i, post_grp_size, dst, rank;
        MPID_Comm *win_comm_ptr;
506

507 508
        /* NOCHECK not specified. We need to notify the source
         * processes that Post has been called. */
509

510
        post_grp_size = post_grp_ptr->size;
511 512
        win_comm_ptr = win_ptr->comm_ptr;
        rank = win_ptr->comm_ptr->rank;
513

514 515 516
        MPIU_CHKLMEM_MALLOC(post_ranks_in_win_grp, int *,
                            post_grp_size * sizeof(int), mpi_errno, "post_ranks_in_win_grp");
        mpi_errno = fill_ranks_in_win_grp(win_ptr, post_grp_ptr, post_ranks_in_win_grp);
517 518
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
519 520 521 522 523

        MPIU_CHKLMEM_MALLOC(req, MPI_Request *, post_grp_size * sizeof(MPI_Request),
                            mpi_errno, "req");
        MPIU_CHKLMEM_MALLOC(status, MPI_Status *, post_grp_size * sizeof(MPI_Status),
                            mpi_errno, "status");
524

525 526
        /* Send a 0-byte message to the source processes */
        for (i = 0; i < post_grp_size; i++) {
527
            dst = post_ranks_in_win_grp[i];
528

529 530 531 532
            if (dst != rank) {
                MPID_Request *req_ptr;
                mpi_errno = MPID_Isend(&i, 0, MPI_INT, dst, SYNC_POST_TAG, win_comm_ptr,
                                       MPID_CONTEXT_INTRA_PT2PT, &req_ptr);
533 534
                if (mpi_errno != MPI_SUCCESS)
                    MPIU_ERR_POP(mpi_errno);
535 536 537 538 539
                req[i] = req_ptr->handle;
            }
            else {
                req[i] = MPI_REQUEST_NULL;
            }
540
        }
541

542 543 544 545 546 547 548 549 550 551 552 553
        mpi_errno = MPIR_Waitall_impl(post_grp_size, req, status);
        if (mpi_errno && mpi_errno != MPI_ERR_IN_STATUS)
            MPIU_ERR_POP(mpi_errno);

        /* --BEGIN ERROR HANDLING-- */
        if (mpi_errno == MPI_ERR_IN_STATUS) {
            for (i = 0; i < post_grp_size; i++) {
                if (status[i].MPI_ERROR != MPI_SUCCESS) {
                    mpi_errno = status[i].MPI_ERROR;
                    MPIU_ERR_POP(mpi_errno);
                }
            }
554
        }
555
        /* --END ERROR HANDLING-- */
556
    }
557

558
  fn_exit:
559 560
    MPIU_CHKLMEM_FREEALL();
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_POST);
561 562
    return mpi_errno;
    /* --BEGIN ERROR HANDLING-- */
563
  fn_fail:
564 565 566 567
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}

568

569 570 571 572 573
#undef FUNCNAME
#define FUNCNAME MPIDI_Win_start
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
int MPIDI_Win_start(MPID_Group * group_ptr, int assert, MPID_Win * win_ptr)
574
{
575
    int mpi_errno = MPI_SUCCESS;
576
    MPIU_CHKLMEM_DECL(2);
577 578
    MPIU_CHKPMEM_DECL(2);
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_START);
579

580
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_START);
581

582
    /* Note that here we cannot distinguish if this access epoch is overlapped
583 584 585 586
     * with an access epoch of FENCE (which is not allowed), since FENCE may be
     * ended up with not unsetting the window state. We can only detect if this
     * access epoch is overlapped with another access epoch of PSCW or Passive
     * Target. */
587 588 589 590
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_NONE &&
                        win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                        win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED,
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
591

592
    win_ptr->start_grp_size = group_ptr->size;
593

594 595 596 597 598
    MPIU_CHKPMEM_MALLOC(win_ptr->start_ranks_in_win_grp, int *,
                        win_ptr->start_grp_size * sizeof(int),
                        mpi_errno, "win_ptr->start_ranks_in_win_grp");

    mpi_errno = fill_ranks_in_win_grp(win_ptr, group_ptr, win_ptr->start_ranks_in_win_grp);
599 600
    if (mpi_errno)
        MPIU_ERR_POP(mpi_errno);
601

602
    if ((assert & MPI_MODE_NOCHECK) == 0) {
Xin Zhao's avatar
Xin Zhao committed
603
        int i, intra_cnt;
604 605 606 607 608 609
        MPI_Request *intra_start_req = NULL;
        MPI_Status *intra_start_status = NULL;
        MPID_Comm *comm_ptr = win_ptr->comm_ptr;
        int rank = comm_ptr->rank;

        /* wait for messages from local processes */
610

611 612 613 614
        /* post IRECVs */
        MPIU_CHKPMEM_MALLOC(win_ptr->start_req, MPI_Request *,
                            win_ptr->start_grp_size * sizeof(MPI_Request),
                            mpi_errno, "win_ptr->start_req");
615

616 617 618
        if (win_ptr->shm_allocated == TRUE) {
            int node_comm_size = comm_ptr->node_comm->local_size;
            MPIU_CHKLMEM_MALLOC(intra_start_req, MPI_Request *,
619
                                node_comm_size * sizeof(MPI_Request), mpi_errno, "intra_start_req");
620 621 622 623
            MPIU_CHKLMEM_MALLOC(intra_start_status, MPI_Status *,
                                node_comm_size * sizeof(MPI_Status),
                                mpi_errno, "intra_start_status");
        }
624

625 626
        intra_cnt = 0;
        for (i = 0; i < win_ptr->start_grp_size; i++) {
627
            MPID_Request *req_ptr;
628 629
            MPIDI_VC_t *orig_vc = NULL, *target_vc = NULL;
            int src = win_ptr->start_ranks_in_win_grp[i];
630

631 632 633
            if (src != rank) {
                MPIDI_Comm_get_vc(comm_ptr, rank, &orig_vc);
                MPIDI_Comm_get_vc(comm_ptr, src, &target_vc);
634

635 636
                mpi_errno = MPID_Irecv(NULL, 0, MPI_INT, src, SYNC_POST_TAG,
                                       comm_ptr, MPID_CONTEXT_INTRA_PT2PT, &req_ptr);
637 638
                if (mpi_errno != MPI_SUCCESS)
                    MPIU_ERR_POP(mpi_errno);
639

640
                if (win_ptr->shm_allocated == TRUE && orig_vc->node_id == target_vc->node_id) {
641 642 643 644 645 646 647 648 649
                    intra_start_req[intra_cnt++] = req_ptr->handle;
                    win_ptr->start_req[i] = MPI_REQUEST_NULL;
                }
                else {
                    win_ptr->start_req[i] = req_ptr->handle;
                }
            }
            else {
                win_ptr->start_req[i] = MPI_REQUEST_NULL;
650
            }
651
        }
652

653 654 655 656 657 658 659 660 661 662 663 664
        /* for targets on SHM, waiting until their IRECVs to be finished */
        if (intra_cnt) {
            mpi_errno = MPIR_Waitall_impl(intra_cnt, intra_start_req, intra_start_status);
            if (mpi_errno && mpi_errno != MPI_ERR_IN_STATUS)
                MPIU_ERR_POP(mpi_errno);
            /* --BEGIN ERROR HANDLING-- */
            if (mpi_errno == MPI_ERR_IN_STATUS) {
                for (i = 0; i < intra_cnt; i++) {
                    if (intra_start_status[i].MPI_ERROR != MPI_SUCCESS) {
                        mpi_errno = intra_start_status[i].MPI_ERROR;
                        MPIU_ERR_POP(mpi_errno);
                    }
665
                }
666
            }
667
            /* --END ERROR HANDLING-- */
668
        }
669 670
    }

671
  finish_start:
672
    /* Set window access state properly. */
673 674
    win_ptr->states.access_state = MPIDI_RMA_PSCW_ISSUED;
    num_active_issued_win++;
675

676 677 678
    /* BEGINNING synchronization: the following counter should be zero. */
    MPIU_Assert(win_ptr->accumulated_ops_cnt == 0);

679
    MPIU_Assert(win_ptr->active_req_cnt == 0);
680

681 682 683 684 685
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

686
  fn_exit:
687 688 689
    MPIU_CHKLMEM_FREEALL();
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_START);
    return mpi_errno;
690
  fn_fail:
691 692
    MPIU_CHKPMEM_REAP();
    goto fn_exit;
693 694 695
}


696

697
#undef FUNCNAME
698
#define FUNCNAME MPIDI_Win_complete
699 700
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
701
int MPIDI_Win_complete(MPID_Win * win_ptr)
702
{
703
    int mpi_errno = MPI_SUCCESS;
704 705 706 707
    int i, dst, rank = win_ptr->comm_ptr->rank;
    int local_completed = 0, remote_completed = 0;
    MPID_Comm *win_comm_ptr = win_ptr->comm_ptr;
    MPIDI_RMA_Target_t *curr_target;
708
    int progress_engine_triggered = 0;
709
    int made_progress;
710
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_COMPLETE);
711

712
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_COMPLETE);
713

714 715 716
    /* Access epochs on the same window must be disjoint. */
    MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PSCW_ISSUED &&
                        win_ptr->states.access_state != MPIDI_RMA_PSCW_GRANTED,
James Dinan's avatar
James Dinan committed
717 718
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");

719 720 721 722 723
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

724 725 726 727 728
    if (win_ptr->states.access_state == MPIDI_RMA_PSCW_ISSUED) {
        while (win_ptr->states.access_state != MPIDI_RMA_PSCW_GRANTED) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
729 730

            /* Mark that we triggered the progress engine
731
             * in this function call. */
732
            progress_engine_triggered = 1;
733
        }
734 735
    }

736 737 738 739 740 741
    for (i = 0; i < win_ptr->start_grp_size; i++) {
        dst = win_ptr->start_ranks_in_win_grp[i];
        if (dst == rank) {
            win_ptr->at_completion_counter--;
            MPIU_Assert(win_ptr->at_completion_counter >= 0);
            continue;
742
        }
743

744 745 746 747 748 749 750
        if (win_comm_ptr->local_size <= win_ptr->num_slots)
            curr_target = win_ptr->slots[dst].target_list;
        else {
            curr_target = win_ptr->slots[dst % win_ptr->num_slots].target_list;
            while (curr_target != NULL && curr_target->target_rank != dst)
                curr_target = curr_target->next;
        }
751

752 753 754 755 756 757 758
        if (curr_target != NULL) {
            /* set sync_flag in sync struct */
            if (curr_target->sync.sync_flag < MPIDI_RMA_SYNC_FLUSH) {
                curr_target->sync.sync_flag = MPIDI_RMA_SYNC_FLUSH;
                curr_target->sync.outstanding_acks++;
            }
            curr_target->win_complete_flag = 1;
759 760
        }
        else {
761 762
            /* FIXME: do we need to wait for remote completion? */
            mpi_errno = send_decr_at_cnt_msg(dst, win_ptr);
763 764
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
765
        }
766 767
    }

768 769
    /* issue out all operations */
    mpi_errno = MPIDI_CH3I_RMA_Make_progress_win(win_ptr, &made_progress);
770 771
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
772 773 774

    /* wait until all slots are empty */
    do {
775 776 777
        mpi_errno = MPIDI_CH3I_RMA_Cleanup_ops_win(win_ptr, &local_completed, &remote_completed);
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
778 779 780 781
        if (!remote_completed) {
            mpi_errno = wait_progress_engine();
            if (mpi_errno != MPI_SUCCESS)
                MPIU_ERR_POP(mpi_errno);
782 783

            /* Mark that we triggered the progress engine
784
             * in this function call. */
785
            progress_engine_triggered = 1;
786
        }
787
    } while (!remote_completed);
788

789 790
    /* Cleanup all targets on this window. */
    mpi_errno = MPIDI_CH3I_RMA_Cleanup_targets_win(win_ptr);
791 792
    if (mpi_errno != MPI_SUCCESS)
        MPIU_ERR_POP(mpi_errno);
793

794
  finish_complete:
795
    /* Set window access state properly. */
796
    win_ptr->states.access_state = MPIDI_RMA_NONE;
797

798 799 800 801
    /* free start group stored in window */
    MPIU_Free(win_ptr->start_ranks_in_win_grp);
    win_ptr->start_ranks_in_win_grp = NULL;
    MPIU_Assert(win_ptr->start_req == NULL);
802

803 804 805
    /* Make sure that all targets are freed. */
    MPIU_Assert(win_ptr->non_empty_slots == 0);

806 807 808
    /* ENDING synchronization: correctly decrement the following counter. */
    win_ptr->accumulated_ops_cnt = 0;

809
    MPIU_Assert(win_ptr->active_req_cnt == 0);
810

811 812
    if (!progress_engine_triggered) {
        /* In some cases (e.g. target is myself, or process on SHM),
813 814 815 816 817 818
         * this function call does not go through the progress engine.
         * Therefore, it is possible that this process never process
         * events coming from other processes. This may cause deadlock in
         * applications where the program execution on this process depends
         * on the happening of events from other processes. Here we poke
         * the progress engine once to avoid such issue.  */
819 820 821 822 823
        mpi_errno = poke_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
    }

824 825
  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_COMPLETE);
826
    return mpi_errno;
827 828 829 830
    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
831
}
832

833 834


835
#undef FUNCNAME
836
#define FUNCNAME MPIDI_Win_wait
837 838
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
839
int MPIDI_Win_wait(MPID_Win * win_ptr)
840
{
841
    int progress_engine_triggered = 0;
842 843 844 845
    int mpi_errno = MPI_SUCCESS;
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_WAIT);

    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_WAIT);
846

847
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
848
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
849

850
    /* wait for all operations from other processes to finish */
851 852 853 854
    while (win_ptr->at_completion_counter) {
        mpi_errno = wait_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
855 856

        /* Mark that we triggered the progress engine
857
         * in this function call. */
858
        progress_engine_triggered = 1;
859 860
    }

861
  finish_wait:
862
    /* Set window exposure state properly. */
863 864
    win_ptr->states.exposure_state = MPIDI_RMA_NONE;

865 866
    if (!progress_engine_triggered) {
        /* In some cases (e.g. target is myself, or process on SHM),
867 868 869 870 871 872
         * this function call does not go through the progress engine.
         * Therefore, it is possible that this process never process
         * events coming from other processes. This may cause deadlock in
         * applications where the program execution on this process depends
         * on the happening of events from other processes. Here we poke
         * the progress engine once to avoid such issue.  */
873 874 875 876 877
        mpi_errno = poke_progress_engine();
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
    }

878 879 880 881 882
    /* Ensure ordering of load/store operations. */
    if (win_ptr->shm_allocated == TRUE) {
        OPA_read_write_barrier();
    }

883 884
  fn_exit:
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_WAIT);
885
    return mpi_errno;
886 887 888 889
    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
    goto fn_exit;
    /* --END ERROR HANDLING-- */
890 891
}

892

893
#undef FUNCNAME
894
#define FUNCNAME MPIDI_Win_test
895 896
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
897
int MPIDI_Win_test(MPID_Win * win_ptr, int *flag)
898 899
{
    int mpi_errno = MPI_SUCCESS;
900
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_TEST);
901

902
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_TEST);
903

904
    MPIU_ERR_CHKANDJUMP(win_ptr->states.exposure_state != MPIDI_RMA_PSCW_EXPO,
905
                        mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
906

907 908
    mpi_errno = MPID_Progress_test();
    if (mpi_errno != MPI_SUCCESS) {
909
        MPIU_ERR_POP(mpi_errno);
910 911
    }

912 913
    *flag = (win_ptr->at_completion_counter) ? 0 : 1;
    if (*flag) {
914
        /* Set window exposure state properly. */
915 916
        win_ptr->states.exposure_state = MPIDI_RMA_NONE;

917 918 919
        /* Ensure ordering of load/store operations. */
        if (win_ptr->shm_allocated == TRUE) {
            OPA_read_write_barrier();
920 921 922
        }
    }

923
  fn_exit:
924
    MPIDI_RMA_FUNC_EXIT(MPID_STATE_MPIDI_WIN_TEST);
925
    return mpi_errno;
926
    /* --BEGIN ERROR HANDLING-- */
927
  fn_fail:
928
    goto fn_exit;
929
    /* --END ERROR HANDLING-- */
930 931
}

932

933 934 935 936 937 938
/********************************************************************************/
/* Passive Target synchronization (including WIN_LOCK, WIN_UNLOCK, WIN_FLUSH,   */
/* WIN_FLUSH_LOCAL, WIN_LOCK_ALL, WIN_UNLOCK_ALL, WIN_FLUSH_ALL,                */
/* WIN_FLUSH_LOCAL_ALL, WIN_SYNC)                                               */
/********************************************************************************/

939
#undef FUNCNAME
940
#define FUNCNAME MPIDI_Win_lock
941 942
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
943
int MPIDI_Win_lock(int lock_type, int dest, int assert, MPID_Win * win_ptr)
944
{
945 946 947 948 949
    int made_progress = 0;
    int shm_target = FALSE;
    int rank = win_ptr->comm_ptr->rank;
    MPIDI_RMA_Target_t *target = NULL;
    MPIDI_VC_t *orig_vc = NULL, *target_vc = NULL;
950
    int mpi_errno = MPI_SUCCESS;
951
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_WIN_LOCK);
952

953
    MPIDI_RMA_FUNC_ENTER(MPID_STATE_MPIDI_WIN_LOCK);
954

955
    /* Note that here we cannot distinguish if this access epoch is overlapped
956 957 958 959
     * with an access epoch of FENCE (which is not allowed), since FENCE may be
     * ended up with not unsetting the window state. We can only detect if this
     * access epoch is overlapped with another access epoch of PSCW or Passive
     * Target. */
960 961 962 963 964 965 966
    if (win_ptr->lock_epoch_count == 0) {
        MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_NONE &&
                            win_ptr->states.access_state != MPIDI_RMA_FENCE_ISSUED &&
                            win_ptr->states.access_state != MPIDI_RMA_FENCE_GRANTED,
                            mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
    else {
Xin Zhao's avatar
Xin Zhao committed
967
        MPIU_ERR_CHKANDJUMP(win_ptr->states.access_state != MPIDI_RMA_PER_TARGET,
968 969
                            mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
970

971 972 973
    if (dest != MPI_PROC_NULL) {
        /* check if we lock the same target window more than once. */
        mpi_errno = MPIDI_CH3I_Win_find_target(win_ptr, dest, &target);
974 975
        if (mpi_errno != MPI_SUCCESS)
            MPIU_ERR_POP(mpi_errno);
976 977
        MPIU_ERR_CHKANDJUMP(target != NULL, mpi_errno, MPI_ERR_RMA_SYNC, "**rmasync");
    }
978

979
    /* Error handling is finished. */
980

981
    if (win_ptr->lock_epoch_count == 0) {
982
        /* Set window access state properly. */
983 984 985 986
        win_ptr->states.access_state = MPIDI_RMA_PER_TARGET;
        num_passive_win++;
    }
    win_ptr->lock_epoch_count++;
987

988
    if (dest == MPI_PROC_NULL)
989
        goto finish_lock;
990

991 992