helper_fns.c 10.7 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"
#include "datatype.h"

11
12
#define COPY_BUFFER_SZ 16384

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
/* These functions are used in the implementation of collective
   operations. They are wrappers around MPID send/recv functions. They do
   sends/receives by setting the context offset to
   MPID_CONTEXT_INTRA_COLL or MPID_CONTEXT_INTER_COLL. */

#undef FUNCNAME
#define FUNCNAME MPIC_Send
#undef FCNAME
#define FCNAME "MPIC_Send"
int MPIC_Send(void *buf, int count, MPI_Datatype datatype, int dest, int tag,
              MPI_Comm comm)
{
    int mpi_errno, context_id;
    MPID_Request *request_ptr=NULL;
    MPID_Comm *comm_ptr=NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIC_SEND);

    MPIDI_PT2PT_FUNC_ENTER_FRONT(MPID_STATE_MPIC_SEND);

    MPID_Comm_get_ptr( comm, comm_ptr );
    context_id = (comm_ptr->comm_kind == MPID_INTRACOMM) ?
        MPID_CONTEXT_INTRA_COLL : MPID_CONTEXT_INTER_COLL;

    mpi_errno = MPID_Send(buf, count, datatype, dest, tag, comm_ptr,
                          context_id, &request_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
    if (request_ptr) {
        mpi_errno = MPIC_Wait(request_ptr);
	if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
	MPID_Request_release(request_ptr);
    }
 fn_exit:
    MPIDI_PT2PT_FUNC_EXIT(MPID_STATE_MPIC_SEND);
    return mpi_errno;
 fn_fail:
    if (request_ptr) {
        MPID_Request_release(request_ptr);
    }
    goto fn_exit;
}

#undef FUNCNAME
#define FUNCNAME MPIC_Recv
#undef FCNAME
#define FCNAME "MPIC_Recv"
int MPIC_Recv(void *buf, int count, MPI_Datatype datatype, int source, int tag,
	     MPI_Comm comm, MPI_Status *status)
{
    int mpi_errno, context_id;
    MPID_Request *request_ptr=NULL;
    MPID_Comm *comm_ptr = NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIC_RECV);

    MPIDI_PT2PT_FUNC_ENTER_BACK(MPID_STATE_MPIC_RECV);

    MPID_Comm_get_ptr( comm, comm_ptr );
    context_id = (comm_ptr->comm_kind == MPID_INTRACOMM) ?
        MPID_CONTEXT_INTRA_COLL : MPID_CONTEXT_INTER_COLL;

    mpi_errno = MPID_Recv(buf, count, datatype, source, tag, comm_ptr,
                          context_id, status, &request_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
    if (request_ptr) {
        mpi_errno = MPIC_Wait(request_ptr);
	if (mpi_errno == MPI_SUCCESS) {
	    if (status != MPI_STATUS_IGNORE) {
		*status = request_ptr->status;
	    }
	    mpi_errno = request_ptr->status.MPI_ERROR;
	}
	else { MPIU_ERR_POP(mpi_errno); }

        MPID_Request_release(request_ptr);
    }
 fn_exit:
    MPIDI_PT2PT_FUNC_EXIT_BACK(MPID_STATE_MPIC_RECV);
    return mpi_errno;
 fn_fail:
    if (request_ptr) { 
	MPID_Request_release(request_ptr);
    }
    goto fn_exit;
}

#undef FUNCNAME
#define FUNCNAME MPIC_Sendrecv
#undef FCNAME
#define FCNAME "MPIC_Sendrecv"
int MPIC_Sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype,
                  int dest, int sendtag, void *recvbuf, int recvcount,
                  MPI_Datatype recvtype, int source, int recvtag,
                  MPI_Comm comm, MPI_Status *status) 
{
    MPID_Request *recv_req_ptr=NULL, *send_req_ptr=NULL;
    int mpi_errno, context_id;
    MPID_Comm *comm_ptr = NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIC_SENDRECV);

    MPIDI_PT2PT_FUNC_ENTER_BOTH(MPID_STATE_MPIC_SENDRECV);

    MPID_Comm_get_ptr( comm, comm_ptr );
    context_id = (comm_ptr->comm_kind == MPID_INTRACOMM) ?
        MPID_CONTEXT_INTRA_COLL : MPID_CONTEXT_INTER_COLL;

    mpi_errno = MPID_Irecv(recvbuf, recvcount, recvtype, source, recvtag,
                           comm_ptr, context_id, &recv_req_ptr);
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
    mpi_errno = MPID_Isend(sendbuf, sendcount, sendtype, dest, sendtag, 
                           comm_ptr, context_id, &send_req_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }

    mpi_errno = MPIC_Wait(send_req_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
    
    mpi_errno = MPIC_Wait(recv_req_ptr);
    if (mpi_errno) { MPIU_ERR_POPFATAL(mpi_errno); }
    if (status != MPI_STATUS_IGNORE)
        *status = recv_req_ptr->status;
    mpi_errno = recv_req_ptr->status.MPI_ERROR;

    MPID_Request_release(send_req_ptr);
    MPID_Request_release(recv_req_ptr);
 fn_fail:
    MPIDI_PT2PT_FUNC_EXIT_BOTH(MPID_STATE_MPIC_SENDRECV);
    return mpi_errno;
}


#undef FUNCNAME
#define FUNCNAME MPIR_Localcopy
#undef FCNAME
#define FCNAME "MPIR_Localcopy"
int MPIR_Localcopy(void *sendbuf, int sendcount, MPI_Datatype sendtype,
                   void *recvbuf, int recvcount, MPI_Datatype recvtype)
{
148
149
150
    int mpi_errno = MPI_SUCCESS;
    int sendtype_iscontig, recvtype_iscontig;
    MPI_Aint sendsize, recvsize, sdata_sz, rdata_sz, copy_sz;
151
    MPI_Aint true_extent, sendtype_true_lb, recvtype_true_lb;
152
    MPIU_CHKLMEM_DECL(1);
153
    MPIU_THREADPRIV_DECL;
154
    MPID_MPI_STATE_DECL(MPID_STATE_MPIR_LOCALCOPY);
155

156
157
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPIR_LOCALCOPY);

158
159
160
161
162
163
164
    MPIU_THREADPRIV_GET;

    MPIR_Nest_incr();
    
    MPIR_Datatype_iscontig(sendtype, &sendtype_iscontig);
    MPIR_Datatype_iscontig(recvtype, &recvtype_iscontig);

165
166
167
168
169
170
    MPID_Datatype_get_size_macro(sendtype, sendsize);
    MPID_Datatype_get_size_macro(recvtype, recvsize);
    sdata_sz = sendsize * sendcount;
    rdata_sz = recvsize * recvcount;
    
    if (sdata_sz > rdata_sz)
171
    {
172
173
174
175
176
177
178
        MPIU_ERR_SET2(mpi_errno, MPI_ERR_TRUNCATE, "**truncate", "**truncate %d %d", sdata_sz, rdata_sz);
        copy_sz = rdata_sz;
    }
    else
    {
        copy_sz = sdata_sz;
    }
179

180
181
182
183
184
185
186
187
    mpi_errno = NMPI_Type_get_true_extent(sendtype, &sendtype_true_lb, &true_extent);
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
    
    mpi_errno = NMPI_Type_get_true_extent(recvtype, &recvtype_true_lb, &true_extent);
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }

    if (sendtype_iscontig && recvtype_iscontig)
    {    
188
189
        memcpy(((char *) recvbuf + recvtype_true_lb), 
               ((char *) sendbuf + sendtype_true_lb), 
190
               copy_sz);
191
    }
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
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
265
266
267
268
269
270
    else if (sendtype_iscontig)
    {
        MPID_Segment seg;
	MPIDI_msg_sz_t last;

	MPID_Segment_init(recvbuf, recvcount, recvtype, &seg, 0);
	last = copy_sz;
	MPID_Segment_unpack(&seg, 0, &last, (char*)sendbuf + sendtype_true_lb);
        MPIU_ERR_CHKANDJUMP(last != copy_sz, mpi_errno, MPI_ERR_TYPE, "**dtypemismatch");        
    }
    else if (recvtype_iscontig)
    {
        MPID_Segment seg;
	MPIDI_msg_sz_t last;

	MPID_Segment_init(sendbuf, sendcount, sendtype, &seg, 0);
	last = copy_sz;
	MPID_Segment_pack(&seg, 0, &last, (char*)recvbuf + recvtype_true_lb);
        MPIU_ERR_CHKANDJUMP(last != copy_sz, mpi_errno, MPI_ERR_TYPE, "**dtypemismatch");
    }
    else
    {
	char * buf;
	MPIDI_msg_sz_t buf_off;
	MPID_Segment sseg;
	MPIDI_msg_sz_t sfirst;
	MPID_Segment rseg;
	MPIDI_msg_sz_t rfirst;
        
        MPIU_CHKLMEM_MALLOC(buf, char *, COPY_BUFFER_SZ, mpi_errno, "buf"); 

	MPID_Segment_init(sendbuf, sendcount, sendtype, &sseg, 0);
	MPID_Segment_init(recvbuf, recvcount, recvtype, &rseg, 0);

	sfirst = 0;
	rfirst = 0;
	buf_off = 0;
	
	while (1)
	{
	    MPI_Aint last;
	    char * buf_end;

	    if (copy_sz - sfirst > COPY_BUFFER_SZ - buf_off)
	    {
		last = sfirst + (COPY_BUFFER_SZ - buf_off);
	    }
	    else
	    {
		last = copy_sz;
	    }
	    
	    MPID_Segment_pack(&sseg, sfirst, &last, buf + buf_off);
	    MPIU_Assert(last > sfirst);
	    
	    buf_end = buf + buf_off + (last - sfirst);
	    sfirst = last;
	    
	    MPID_Segment_unpack(&rseg, rfirst, &last, buf);
	    MPIU_Assert(last > rfirst);

	    rfirst = last;

	    if (rfirst == copy_sz)
	    {
		/* successful completion */
		break;
	    }

            /* if the send side finished, but the recv side couldn't unpack it, there's a datatype mismatch */
            MPIU_ERR_CHKANDJUMP(sfirst == copy_sz, mpi_errno, MPI_ERR_TYPE, "**dtypemismatch");        

            /* if not all data was unpacked, copy it to the front of the buffer for next time */
	    buf_off = sfirst - rfirst;
	    if (buf_off > 0)
	    {
		memmove(buf, buf_end - buf_off, buf_off);
	    }
	}
271
272
    }
    
273
    
274
  fn_exit:
275
    MPIU_CHKLMEM_FREEALL();
276
    MPIR_Nest_decr();
277
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPIR_LOCALCOPY);
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
    return mpi_errno;

  fn_fail:
    goto fn_exit;
}


#undef FUNCNAME
#define FUNCNAME MPIC_Isend
#undef FCNAME
#define FCNAME "MPIC_Isend"
int MPIC_Isend(void *buf, int count, MPI_Datatype datatype, int dest, int tag,
              MPI_Comm comm, MPI_Request *request)
{
    int mpi_errno, context_id;
    MPID_Request *request_ptr=NULL;
    MPID_Comm *comm_ptr=NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIC_ISEND);

    MPIDI_PT2PT_FUNC_ENTER_FRONT(MPID_STATE_MPIC_ISEND);

    MPID_Comm_get_ptr( comm, comm_ptr );
    context_id = (comm_ptr->comm_kind == MPID_INTRACOMM) ?
        MPID_CONTEXT_INTRA_COLL : MPID_CONTEXT_INTER_COLL;

    mpi_errno = MPID_Isend(buf, count, datatype, dest, tag, comm_ptr,
                          context_id, &request_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); } 

    *request = request_ptr->handle;

 fn_fail:
    MPIDI_PT2PT_FUNC_EXIT(MPID_STATE_MPIC_ISEND);
    return mpi_errno;
}


#undef FUNCNAME
#define FUNCNAME MPIC_Irecv
#undef FCNAME
#define FCNAME "MPIC_Irecv"
int MPIC_Irecv(void *buf, int count, MPI_Datatype datatype, int
               source, int tag, MPI_Comm comm, MPI_Request *request)
{
    int mpi_errno, context_id;
    MPID_Request *request_ptr=NULL;
    MPID_Comm *comm_ptr = NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIC_IRECV);

    MPIDI_PT2PT_FUNC_ENTER_BACK(MPID_STATE_MPIC_IRECV);

    MPID_Comm_get_ptr( comm, comm_ptr );
    context_id = (comm_ptr->comm_kind == MPID_INTRACOMM) ?
        MPID_CONTEXT_INTRA_COLL : MPID_CONTEXT_INTER_COLL;

    mpi_errno = MPID_Irecv(buf, count, datatype, source, tag, comm_ptr,
                          context_id, &request_ptr); 
    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }

    *request = request_ptr->handle;

 fn_fail:
    MPIDI_PT2PT_FUNC_EXIT_BACK(MPID_STATE_MPIC_IRECV);
    return mpi_errno;
}

344
345
346
347
/* FIXME: For the brief-global and finer-grain control, we must ensure that
   the global lock is *not* held when this routine is called. (unless we change
   progress_start/end to grab the lock, in which case we must *still* make
   sure that the lock is not held when this routine is called). */
348
349
350
351
352
353
#undef FUNCNAME
#define FUNCNAME MPIC_Wait
#undef FCNAME
#define FCNAME "MPIC_Wait"
int MPIC_Wait(MPID_Request * request_ptr)
{
Rajeev Thakur's avatar
Rajeev Thakur committed
354
    int mpi_errno = MPI_SUCCESS;
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
    MPIDI_STATE_DECL(MPID_STATE_MPIC_WAIT);

    MPIDI_PT2PT_FUNC_ENTER(MPID_STATE_MPIC_WAIT);
    if ((*(request_ptr)->cc_ptr) != 0)
    {
	MPID_Progress_state progress_state;
	
	MPID_Progress_start(&progress_state);
	while((*(request_ptr)->cc_ptr) != 0)
	{
	    mpi_errno = MPID_Progress_wait(&progress_state);
	    if (mpi_errno) { MPIU_ERR_POP(mpi_errno); }
	}
	MPID_Progress_end(&progress_state);
    }

 fn_fail:
    MPIDI_PT2PT_FUNC_EXIT(MPID_STATE_MPIC_WAIT);
373
    return mpi_errno;
374
}