Actual source code: data_ex.c
1: /*
2: Build a few basic tools to help with partitioned domains.
4: 1)
5: On each processor, have a DomainExchangerTopology.
6: This is a doubly-connected edge list which enumerates the
7: communication paths between connected processors. By numbering
8: these paths we can always uniquely assign message identifiers.
10: edge
11: 10
12: proc ---------> proc
13: 0 <-------- 1
14: 11
15: twin
17: Eg: Proc 0 send to proc 1 with message id is 10. To receive the correct
18: message, proc 1 looks for the edge connected to proc 0, and then the
19: message id comes from the twin of that edge
21: 2)
22: A DomainExchangerArrayPacker.
23: A little function which given a piece of data, will memcpy the data into
24: an array (which will be sent to procs) into the correct place.
26: On Proc 1 we sent data to procs 0,2,3. The data is on different lengths.
27: All data gets jammed into single array. Need to "jam" data into correct locations
28: The Packer knows how much is to going to each processor and keeps track of the inserts
29: so as to avoid ever packing TOO much into one slot, and inevatbly corrupting some memory
31: data to 0 data to 2 data to 3
33: |--------|-----------------|--|
35: User has to unpack message themselves. I can get you the pointer for each i
36: entry, but you'll have to cast it to the appropriate data type.
38: Phase A: Build topology
40: Phase B: Define message lengths
42: Phase C: Pack data
44: Phase D: Send data
46: + Constructor
47: DMSwarmDataExCreate()
48: + Phase A
49: DMSwarmDataExTopologyInitialize()
50: DMSwarmDataExTopologyAddNeighbour()
51: DMSwarmDataExTopologyAddNeighbour()
52: DMSwarmDataExTopologyFinalize()
53: + Phase B
54: DMSwarmDataExZeroAllSendCount()
55: DMSwarmDataExAddToSendCount()
56: DMSwarmDataExAddToSendCount()
57: DMSwarmDataExAddToSendCount()
58: + Phase C
59: DMSwarmDataExPackInitialize()
60: DMSwarmDataExPackData()
61: DMSwarmDataExPackData()
62: DMSwarmDataExPackFinalize()
63: +Phase D
64: DMSwarmDataExBegin()
65: ... perform any calculations ...
66: DMSwarmDataExEnd()
68: ... user calls any getters here ...
70: */
71: #include <petscvec.h>
72: #include <petscmat.h>
73: #include <petsc/private/petscimpl.h>
75: #include "../src/dm/impls/swarm/data_ex.h"
77: const char *status_names[] = {"initialized", "finalized", "unknown"};
79: PETSC_EXTERN PetscLogEvent DMSWARM_DataExchangerTopologySetup;
80: PETSC_EXTERN PetscLogEvent DMSWARM_DataExchangerBegin;
81: PETSC_EXTERN PetscLogEvent DMSWARM_DataExchangerEnd;
82: PETSC_EXTERN PetscLogEvent DMSWARM_DataExchangerSendCount;
83: PETSC_EXTERN PetscLogEvent DMSWARM_DataExchangerPack;
85: PetscErrorCode DMSwarmDataExCreate(MPI_Comm comm, const PetscInt count, DMSwarmDataEx *ex)
86: {
87: DMSwarmDataEx d;
89: PetscFunctionBegin;
90: PetscCall(PetscNew(&d));
91: PetscCallMPI(MPI_Comm_dup(comm, &d->comm));
92: PetscCallMPI(MPI_Comm_rank(d->comm, &d->rank));
94: d->instance = count;
96: d->topology_status = DEOBJECT_STATE_UNKNOWN;
97: d->message_lengths_status = DEOBJECT_STATE_UNKNOWN;
98: d->packer_status = DEOBJECT_STATE_UNKNOWN;
99: d->communication_status = DEOBJECT_STATE_UNKNOWN;
101: d->n_neighbour_procs = -1;
102: d->neighbour_procs = NULL;
104: d->messages_to_be_sent = NULL;
105: d->message_offsets = NULL;
106: d->messages_to_be_recvieved = NULL;
108: d->unit_message_size = (size_t)-1;
109: d->send_message = NULL;
110: d->send_message_length = -1;
111: d->recv_message = NULL;
112: d->recv_message_length = -1;
113: d->total_pack_cnt = -1;
114: d->pack_cnt = NULL;
116: d->send_tags = NULL;
117: d->recv_tags = NULL;
119: d->_stats = NULL;
120: d->_requests = NULL;
121: *ex = d;
122: PetscFunctionReturn(PETSC_SUCCESS);
123: }
125: /*
126: This code is horrible, who let it get into main.
128: Should be printing to a viewer, should not be using PETSC_COMM_WORLD
130: */
131: PetscErrorCode DMSwarmDataExView(DMSwarmDataEx d)
132: {
133: PetscMPIInt p;
135: PetscFunctionBegin;
136: PetscCall(PetscPrintf(PETSC_COMM_WORLD, "DMSwarmDataEx: instance=%" PetscInt_FMT "\n", d->instance));
137: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " topology status: %s \n", status_names[d->topology_status]));
138: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " message lengths status: %s \n", status_names[d->message_lengths_status]));
139: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " packer status status: %s \n", status_names[d->packer_status]));
140: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " communication status: %s \n", status_names[d->communication_status]));
142: if (d->topology_status == DEOBJECT_FINALIZED) {
143: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " Topology:\n"));
144: PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, " [%d] neighbours: %d \n", d->rank, d->n_neighbour_procs));
145: for (p = 0; p < d->n_neighbour_procs; p++) PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, " [%d] neighbour[%d] = %d \n", d->rank, p, d->neighbour_procs[p]));
146: PetscCall(PetscSynchronizedFlush(PETSC_COMM_WORLD, stdout));
147: }
149: if (d->message_lengths_status == DEOBJECT_FINALIZED) {
150: PetscCall(PetscPrintf(PETSC_COMM_WORLD, " Message lengths:\n"));
151: PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, " [%d] atomic size: %ld \n", d->rank, (long int)d->unit_message_size));
152: for (p = 0; p < d->n_neighbour_procs; p++) PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, " [%d] >>>>> ( %" PetscInt_FMT " units :: tag = %d) >>>>> [%d] \n", d->rank, d->messages_to_be_sent[p], d->send_tags[p], d->neighbour_procs[p]));
153: for (p = 0; p < d->n_neighbour_procs; p++) {
154: PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, " [%d] <<<<< ( %" PetscInt_FMT " units :: tag = %d) <<<<< [%d] \n", d->rank, d->messages_to_be_recvieved[p], d->recv_tags[p], d->neighbour_procs[p]));
155: }
156: PetscCall(PetscSynchronizedFlush(PETSC_COMM_WORLD, stdout));
157: }
158: PetscFunctionReturn(PETSC_SUCCESS);
159: }
161: PetscErrorCode DMSwarmDataExDestroy(DMSwarmDataEx d)
162: {
163: PetscFunctionBegin;
164: PetscCallMPI(MPI_Comm_free(&d->comm));
165: if (d->neighbour_procs) PetscCall(PetscFree(d->neighbour_procs));
166: if (d->messages_to_be_sent) PetscCall(PetscFree(d->messages_to_be_sent));
167: if (d->message_offsets) PetscCall(PetscFree(d->message_offsets));
168: if (d->messages_to_be_recvieved) PetscCall(PetscFree(d->messages_to_be_recvieved));
169: if (d->send_message) PetscCall(PetscFree(d->send_message));
170: if (d->recv_message) PetscCall(PetscFree(d->recv_message));
171: if (d->pack_cnt) PetscCall(PetscFree(d->pack_cnt));
172: if (d->send_tags) PetscCall(PetscFree(d->send_tags));
173: if (d->recv_tags) PetscCall(PetscFree(d->recv_tags));
174: if (d->_stats) PetscCall(PetscFree(d->_stats));
175: if (d->_requests) PetscCall(PetscFree(d->_requests));
176: PetscCall(PetscFree(d));
177: PetscFunctionReturn(PETSC_SUCCESS);
178: }
180: /* === Phase A === */
182: PetscErrorCode DMSwarmDataExTopologyInitialize(DMSwarmDataEx d)
183: {
184: PetscFunctionBegin;
185: d->topology_status = DEOBJECT_INITIALIZED;
186: d->n_neighbour_procs = 0;
187: PetscCall(PetscFree(d->neighbour_procs));
188: PetscCall(PetscFree(d->messages_to_be_sent));
189: PetscCall(PetscFree(d->message_offsets));
190: PetscCall(PetscFree(d->messages_to_be_recvieved));
191: PetscCall(PetscFree(d->pack_cnt));
192: PetscCall(PetscFree(d->send_tags));
193: PetscCall(PetscFree(d->recv_tags));
194: PetscFunctionReturn(PETSC_SUCCESS);
195: }
197: PetscErrorCode DMSwarmDataExTopologyAddNeighbour(DMSwarmDataEx d, const PetscMPIInt proc_id)
198: {
199: PetscMPIInt n, found;
200: PetscMPIInt size;
202: PetscFunctionBegin;
203: PetscCheck(d->topology_status != DEOBJECT_FINALIZED, d->comm, PETSC_ERR_ARG_WRONGSTATE, "Topology has been finalized. To modify or update call DMSwarmDataExTopologyInitialize() first");
204: PetscCheck(d->topology_status == DEOBJECT_INITIALIZED, d->comm, PETSC_ERR_ARG_WRONGSTATE, "Topology must be initialised. Call DMSwarmDataExTopologyInitialize() first");
206: /* error on negative entries */
207: PetscCheck(proc_id >= 0, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Trying to set proc neighbour with a rank < 0");
208: /* error on ranks larger than number of procs in communicator */
209: PetscCallMPI(MPI_Comm_size(d->comm, &size));
210: PetscCheck(proc_id < size, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Trying to set proc neighbour %d with a rank >= size %d", proc_id, size);
211: if (d->n_neighbour_procs == 0) PetscCall(PetscMalloc1(1, &d->neighbour_procs));
212: /* check for proc_id */
213: found = 0;
214: for (n = 0; n < d->n_neighbour_procs; n++) {
215: if (d->neighbour_procs[n] == proc_id) found = 1;
216: }
217: if (found == 0) { /* add it to list */
218: PetscCall(PetscRealloc(sizeof(PetscMPIInt) * (d->n_neighbour_procs + 1), &d->neighbour_procs));
219: d->neighbour_procs[d->n_neighbour_procs] = proc_id;
220: d->n_neighbour_procs++;
221: }
222: PetscFunctionReturn(PETSC_SUCCESS);
223: }
225: /*
226: counter: the index of the communication object
227: N: the number of processors
228: r0: rank of sender
229: r1: rank of receiver
231: procs = { 0, 1, 2, 3 }
233: 0 ==> 0 e=0
234: 0 ==> 1 e=1
235: 0 ==> 2 e=2
236: 0 ==> 3 e=3
238: 1 ==> 0 e=4
239: 1 ==> 1 e=5
240: 1 ==> 2 e=6
241: 1 ==> 3 e=7
243: 2 ==> 0 e=8
244: 2 ==> 1 e=9
245: 2 ==> 2 e=10
246: 2 ==> 3 e=11
248: 3 ==> 0 e=12
249: 3 ==> 1 e=13
250: 3 ==> 2 e=14
251: 3 ==> 3 e=15
253: If we require that proc A sends to proc B, then the SEND tag index will be given by
254: N * rank(A) + rank(B) + offset
255: If we require that proc A will receive from proc B, then the RECV tag index will be given by
256: N * rank(B) + rank(A) + offset
258: */
259: static void _get_tags(PetscInt counter, PetscMPIInt N, PetscMPIInt r0, PetscMPIInt r1, PetscMPIInt maxtag, PetscMPIInt *_st, PetscMPIInt *_rt)
260: {
261: PetscMPIInt st, rt;
263: st = (N * r0 + r1 + N * N * counter) % maxtag;
264: rt = (N * r1 + r0 + N * N * counter) % maxtag;
265: *_st = st;
266: *_rt = rt;
267: }
269: /*
270: Makes the communication map symmetric
271: */
272: static PetscErrorCode DMSwarmDataExCompleteCommunicationMap_Private(MPI_Comm comm, PetscMPIInt n, const PetscMPIInt proc_neighbours[], PetscMPIInt *n_new, PetscMPIInt **proc_neighbours_new)
273: {
274: Mat A;
275: PetscInt i, j, nc;
276: PetscInt n_, *proc_neighbours_;
277: PetscInt rank_;
278: PetscMPIInt size, rank;
279: PetscScalar *vals;
280: const PetscInt *cols;
281: const PetscScalar *red_vals;
282: PetscMPIInt _n_new, *_proc_neighbours_new;
284: PetscFunctionBegin;
285: n_ = n;
286: PetscCall(PetscMalloc1(n_, &proc_neighbours_));
287: for (i = 0; i < n_; ++i) proc_neighbours_[i] = proc_neighbours[i];
288: PetscCallMPI(MPI_Comm_size(comm, &size));
289: PetscCallMPI(MPI_Comm_rank(comm, &rank));
290: rank_ = rank;
292: PetscCall(MatCreate(comm, &A));
293: PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, size, size));
294: PetscCall(MatSetType(A, MATAIJ));
295: PetscCall(MatSeqAIJSetPreallocation(A, 1, NULL));
296: PetscCall(MatMPIAIJSetPreallocation(A, n_, NULL, n_, NULL));
297: PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_FALSE));
298: /* Build original map */
299: PetscCall(PetscMalloc1(n_, &vals));
300: for (i = 0; i < n_; ++i) vals[i] = 1.0;
301: PetscCall(MatSetValues(A, 1, &rank_, n_, proc_neighbours_, vals, INSERT_VALUES));
302: PetscCall(MatAssemblyBegin(A, MAT_FLUSH_ASSEMBLY));
303: PetscCall(MatAssemblyEnd(A, MAT_FLUSH_ASSEMBLY));
304: /* Now force all other connections if they are not already there */
305: /* It's more efficient to do them all at once */
306: for (i = 0; i < n_; ++i) vals[i] = 2.0;
307: PetscCall(MatSetValues(A, n_, proc_neighbours_, 1, &rank_, vals, INSERT_VALUES));
308: PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
309: PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
310: /*
311: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO));
312: PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD));
313: PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
314: */
315: if ((n_new != NULL) && (proc_neighbours_new != NULL)) {
316: PetscCall(MatGetRow(A, rank_, &nc, &cols, &red_vals));
317: PetscCall(PetscMPIIntCast(nc, &_n_new));
318: PetscCall(PetscMalloc1(_n_new, &_proc_neighbours_new));
319: for (j = 0; j < nc; ++j) PetscCall(PetscMPIIntCast(cols[j], &_proc_neighbours_new[j]));
320: PetscCall(MatRestoreRow(A, rank_, &nc, &cols, &red_vals));
321: *n_new = _n_new;
322: *proc_neighbours_new = _proc_neighbours_new;
323: }
324: PetscCall(MatDestroy(&A));
325: PetscCall(PetscFree(vals));
326: PetscCall(PetscFree(proc_neighbours_));
327: PetscCallMPI(MPI_Barrier(comm));
328: PetscFunctionReturn(PETSC_SUCCESS);
329: }
331: PetscErrorCode DMSwarmDataExTopologyFinalize(DMSwarmDataEx d)
332: {
333: PetscMPIInt symm_nn = 0, *symm_procs = NULL, r0, n, st, rt, size, *maxtag, iflg;
335: PetscFunctionBegin;
336: PetscCheck(d->topology_status == DEOBJECT_INITIALIZED, d->comm, PETSC_ERR_ARG_WRONGSTATE, "Topology must be initialised. Call DMSwarmDataExTopologyInitialize() first");
338: PetscCall(PetscLogEventBegin(DMSWARM_DataExchangerTopologySetup, 0, 0, 0, 0));
339: /* given information about all my neighbours, make map symmetric */
340: PetscCall(DMSwarmDataExCompleteCommunicationMap_Private(d->comm, d->n_neighbour_procs, d->neighbour_procs, &symm_nn, &symm_procs));
341: /* update my arrays */
342: PetscCall(PetscFree(d->neighbour_procs));
343: d->n_neighbour_procs = symm_nn;
344: d->neighbour_procs = symm_procs;
345: /* allocates memory */
346: if (!d->messages_to_be_sent) PetscCall(PetscMalloc1(d->n_neighbour_procs + 1, &d->messages_to_be_sent));
347: if (!d->message_offsets) PetscCall(PetscMalloc1(d->n_neighbour_procs + 1, &d->message_offsets));
348: if (!d->messages_to_be_recvieved) PetscCall(PetscMalloc1(d->n_neighbour_procs + 1, &d->messages_to_be_recvieved));
349: if (!d->pack_cnt) PetscCall(PetscMalloc(sizeof(PetscInt) * d->n_neighbour_procs, &d->pack_cnt));
350: if (!d->_stats) PetscCall(PetscMalloc(sizeof(MPI_Status) * 2 * d->n_neighbour_procs, &d->_stats));
351: if (!d->_requests) PetscCall(PetscMalloc(sizeof(MPI_Request) * 2 * d->n_neighbour_procs, &d->_requests));
352: if (!d->send_tags) PetscCall(PetscMalloc(sizeof(int) * d->n_neighbour_procs, &d->send_tags));
353: if (!d->recv_tags) PetscCall(PetscMalloc(sizeof(int) * d->n_neighbour_procs, &d->recv_tags));
354: /* compute message tags */
355: PetscCallMPI(MPI_Comm_size(d->comm, &size));
356: PetscCallMPI(MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_TAG_UB, &maxtag, &iflg));
357: PetscCheck(iflg, d->comm, PETSC_ERR_LIB, "MPI error: MPI_Comm_get_attr() is not returning a MPI_TAG_UB");
358: r0 = d->rank;
359: for (n = 0; n < d->n_neighbour_procs; ++n) {
360: PetscMPIInt r1 = d->neighbour_procs[n];
362: _get_tags(d->instance, size, r0, r1, *maxtag, &st, &rt);
363: d->send_tags[n] = st;
364: d->recv_tags[n] = rt;
365: }
366: d->topology_status = DEOBJECT_FINALIZED;
367: PetscCall(PetscLogEventEnd(DMSWARM_DataExchangerTopologySetup, 0, 0, 0, 0));
368: PetscFunctionReturn(PETSC_SUCCESS);
369: }
371: /* === Phase B === */
372: static PetscErrorCode _DMSwarmDataExConvertProcIdToLocalIndex(DMSwarmDataEx de, PetscMPIInt proc_id, PetscMPIInt *local)
373: {
374: PetscMPIInt i, np;
376: PetscFunctionBegin;
377: np = de->n_neighbour_procs;
378: *local = -1;
379: for (i = 0; i < np; ++i) {
380: if (proc_id == de->neighbour_procs[i]) {
381: *local = i;
382: break;
383: }
384: }
385: PetscFunctionReturn(PETSC_SUCCESS);
386: }
388: PetscErrorCode DMSwarmDataExInitializeSendCount(DMSwarmDataEx de)
389: {
390: PetscMPIInt i;
392: PetscFunctionBegin;
393: PetscCheck(de->topology_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Topology not finalized");
394: PetscCall(PetscLogEventBegin(DMSWARM_DataExchangerSendCount, 0, 0, 0, 0));
395: de->message_lengths_status = DEOBJECT_INITIALIZED;
396: for (i = 0; i < de->n_neighbour_procs; ++i) de->messages_to_be_sent[i] = 0;
397: PetscFunctionReturn(PETSC_SUCCESS);
398: }
400: /*
401: 1) only allows counters to be set on neighbouring cpus
402: */
403: PetscErrorCode DMSwarmDataExAddToSendCount(DMSwarmDataEx de, const PetscMPIInt proc_id, const PetscInt count)
404: {
405: PetscMPIInt local_val;
407: PetscFunctionBegin;
408: PetscCheck(de->message_lengths_status != DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Message lengths have been defined. To modify these call DMSwarmDataExInitializeSendCount() first");
409: PetscCheck(de->message_lengths_status == DEOBJECT_INITIALIZED, de->comm, PETSC_ERR_ORDER, "Message lengths must be defined. Call DMSwarmDataExInitializeSendCount() first");
411: PetscCall(_DMSwarmDataExConvertProcIdToLocalIndex(de, proc_id, &local_val));
412: PetscCheck(local_val != -1, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Proc %d is not a valid neighbour rank", (int)proc_id);
414: de->messages_to_be_sent[local_val] = de->messages_to_be_sent[local_val] + count;
415: PetscFunctionReturn(PETSC_SUCCESS);
416: }
418: PetscErrorCode DMSwarmDataExFinalizeSendCount(DMSwarmDataEx de)
419: {
420: PetscFunctionBegin;
421: PetscCheck(de->message_lengths_status == DEOBJECT_INITIALIZED, de->comm, PETSC_ERR_ORDER, "Message lengths must be defined. Call DMSwarmDataExInitializeSendCount() first");
423: de->message_lengths_status = DEOBJECT_FINALIZED;
424: PetscCall(PetscLogEventEnd(DMSWARM_DataExchangerSendCount, 0, 0, 0, 0));
425: PetscFunctionReturn(PETSC_SUCCESS);
426: }
428: /* === Phase C === */
429: /*
430: zero out all send counts
431: free send and recv buffers
432: zeros out message length
433: zeros out all counters
434: zero out packed data counters
435: */
436: static PetscErrorCode _DMSwarmDataExInitializeTmpStorage(DMSwarmDataEx de)
437: {
438: PetscMPIInt i, np;
440: PetscFunctionBegin;
441: np = de->n_neighbour_procs;
442: for (i = 0; i < np; ++i) {
443: /* de->messages_to_be_sent[i] = -1; */
444: de->messages_to_be_recvieved[i] = -1;
445: }
446: PetscCall(PetscFree(de->send_message));
447: PetscCall(PetscFree(de->recv_message));
448: PetscFunctionReturn(PETSC_SUCCESS);
449: }
451: /*
452: Zeros out pack data counters
453: Ensures mesaage length is set
454: Checks send counts properly initialized
455: allocates space for pack data
456: */
457: PetscErrorCode DMSwarmDataExPackInitialize(DMSwarmDataEx de, size_t unit_message_size)
458: {
459: PetscMPIInt i, np;
460: PetscInt total;
462: PetscFunctionBegin;
463: PetscCheck(de->topology_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Topology not finalized");
464: PetscCheck(de->message_lengths_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Message lengths not finalized");
465: PetscCall(PetscLogEventBegin(DMSWARM_DataExchangerPack, 0, 0, 0, 0));
466: de->packer_status = DEOBJECT_INITIALIZED;
467: PetscCall(_DMSwarmDataExInitializeTmpStorage(de));
468: np = de->n_neighbour_procs;
469: de->unit_message_size = unit_message_size;
470: total = 0;
471: for (i = 0; i < np; ++i) {
472: if (de->messages_to_be_sent[i] == -1) {
473: PetscMPIInt proc_neighour = de->neighbour_procs[i];
474: SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ORDER, "Messages_to_be_sent[neighbour_proc=%d] is un-initialised. Call DMSwarmDataExSetSendCount() first", proc_neighour);
475: }
476: total = total + de->messages_to_be_sent[i];
477: }
478: /* create space for the data to be sent */
479: PetscCall(PetscMalloc(unit_message_size * (total + 1), &de->send_message));
480: /* initialize memory */
481: PetscCall(PetscMemzero(de->send_message, unit_message_size * (total + 1)));
482: /* set total items to send */
483: de->send_message_length = total;
484: de->message_offsets[0] = 0;
485: total = de->messages_to_be_sent[0];
486: for (i = 1; i < np; ++i) {
487: de->message_offsets[i] = total;
488: total = total + de->messages_to_be_sent[i];
489: }
490: /* init the packer counters */
491: de->total_pack_cnt = 0;
492: for (i = 0; i < np; ++i) de->pack_cnt[i] = 0;
493: PetscFunctionReturn(PETSC_SUCCESS);
494: }
496: /*
497: Ensures data gets been packed appropriately and no overlaps occur
498: */
499: PetscErrorCode DMSwarmDataExPackData(DMSwarmDataEx de, PetscMPIInt proc_id, PetscInt n, void *data)
500: {
501: PetscMPIInt local;
502: PetscInt insert_location;
503: void *dest;
505: PetscFunctionBegin;
506: PetscCheck(de->packer_status != DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Packed data have been defined. To modify these call DMSwarmDataExInitializeSendCount(), DMSwarmDataExAddToSendCount(), DMSwarmDataExPackInitialize() first");
507: PetscCheck(de->packer_status == DEOBJECT_INITIALIZED, de->comm, PETSC_ERR_ORDER, "Packed data must be defined. Call DMSwarmDataExInitializeSendCount(), DMSwarmDataExAddToSendCount(), DMSwarmDataExPackInitialize() first");
509: PetscCheck(de->send_message, de->comm, PETSC_ERR_ORDER, "send_message is not initialized. Call DMSwarmDataExPackInitialize() first");
510: PetscCall(_DMSwarmDataExConvertProcIdToLocalIndex(de, proc_id, &local));
511: PetscCheck(local != -1, PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "proc_id %d is not registered neighbour", proc_id);
512: PetscCheck(n + de->pack_cnt[local] <= de->messages_to_be_sent[local], PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Trying to pack too many entries to be sent to proc %d. Space requested = %" PetscInt_FMT ": Attempt to insert %" PetscInt_FMT, proc_id, de->messages_to_be_sent[local], n + de->pack_cnt[local]);
514: /* copy memory */
515: insert_location = de->message_offsets[local] + de->pack_cnt[local];
516: dest = ((char *)de->send_message) + de->unit_message_size * insert_location;
517: PetscCall(PetscMemcpy(dest, data, de->unit_message_size * n));
518: /* increment counter */
519: de->pack_cnt[local] = de->pack_cnt[local] + n;
520: PetscFunctionReturn(PETSC_SUCCESS);
521: }
523: /*
524: *) Ensures all data has been packed
525: */
526: PetscErrorCode DMSwarmDataExPackFinalize(DMSwarmDataEx de)
527: {
528: PetscMPIInt i, np;
529: PetscInt total;
531: PetscFunctionBegin;
532: PetscCheck(de->packer_status == DEOBJECT_INITIALIZED, de->comm, PETSC_ERR_ORDER, "Packer has not been initialized. Must call DMSwarmDataExPackInitialize() first.");
533: np = de->n_neighbour_procs;
534: for (i = 0; i < np; ++i) {
535: PetscCheck(de->pack_cnt[i] == de->messages_to_be_sent[i], PETSC_COMM_SELF, PETSC_ERR_ARG_WRONGSTATE, "Not all messages for neighbour[%d] have been packed. Expected %" PetscInt_FMT " : Inserted %" PetscInt_FMT, de->neighbour_procs[i], de->messages_to_be_sent[i], de->pack_cnt[i]);
536: }
537: /* init */
538: for (i = 0; i < np; ++i) de->messages_to_be_recvieved[i] = -1;
539: /* figure out the recv counts here */
540: for (i = 0; i < np; ++i) PetscCallMPI(MPIU_Isend(&de->messages_to_be_sent[i], 1, MPIU_INT, de->neighbour_procs[i], de->send_tags[i], de->comm, &de->_requests[i]));
541: for (i = 0; i < np; ++i) PetscCallMPI(MPIU_Irecv(&de->messages_to_be_recvieved[i], 1, MPIU_INT, de->neighbour_procs[i], de->recv_tags[i], de->comm, &de->_requests[np + i]));
542: PetscCallMPI(MPI_Waitall(2 * np, de->_requests, de->_stats));
543: /* create space for the data to be recvieved */
544: total = 0;
545: for (i = 0; i < np; ++i) total = total + de->messages_to_be_recvieved[i];
546: PetscCall(PetscMalloc(de->unit_message_size * (total + 1), &de->recv_message));
547: /* initialize memory */
548: PetscCall(PetscMemzero(de->recv_message, de->unit_message_size * (total + 1)));
549: /* set total items to receive */
550: de->recv_message_length = total;
551: de->packer_status = DEOBJECT_FINALIZED;
552: de->communication_status = DEOBJECT_INITIALIZED;
553: PetscCall(PetscLogEventEnd(DMSWARM_DataExchangerPack, 0, 0, 0, 0));
554: PetscFunctionReturn(PETSC_SUCCESS);
555: }
557: /* do the actual message passing */
558: PetscErrorCode DMSwarmDataExBegin(DMSwarmDataEx de)
559: {
560: PetscMPIInt i, np;
561: void *dest;
563: PetscFunctionBegin;
564: PetscCheck(de->topology_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Topology not finalized");
565: PetscCheck(de->message_lengths_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Message lengths not finalized");
566: PetscCheck(de->packer_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Packer not finalized");
567: PetscCheck(de->communication_status != DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ORDER, "Communication has already been finalized. Must call DMSwarmDataExInitialize() first.");
568: PetscCheck(de->recv_message, de->comm, PETSC_ERR_ORDER, "recv_message has not been initialized. Must call DMSwarmDataExPackFinalize() first");
569: PetscCall(PetscLogEventBegin(DMSWARM_DataExchangerBegin, 0, 0, 0, 0));
570: np = de->n_neighbour_procs;
571: /* == NON BLOCKING == */
572: for (i = 0; i < np; ++i) {
573: dest = ((char *)de->send_message) + de->unit_message_size * de->message_offsets[i];
574: PetscCallMPI(MPIU_Isend(dest, de->messages_to_be_sent[i] * de->unit_message_size, MPI_CHAR, de->neighbour_procs[i], de->send_tags[i], de->comm, &de->_requests[i]));
575: }
576: PetscCall(PetscLogEventEnd(DMSWARM_DataExchangerBegin, 0, 0, 0, 0));
577: PetscFunctionReturn(PETSC_SUCCESS);
578: }
580: /* do the actual message passing now */
581: PetscErrorCode DMSwarmDataExEnd(DMSwarmDataEx de)
582: {
583: PetscMPIInt i, np;
584: PetscInt total;
585: PetscInt *message_recv_offsets;
586: void *dest;
588: PetscFunctionBegin;
589: PetscCheck(de->communication_status == DEOBJECT_INITIALIZED, de->comm, PETSC_ERR_ORDER, "Communication has not been initialized. Must call DMSwarmDataExInitialize() first.");
590: PetscCheck(de->recv_message, de->comm, PETSC_ERR_ORDER, "recv_message has not been initialized. Must call DMSwarmDataExPackFinalize() first");
591: PetscCall(PetscLogEventBegin(DMSWARM_DataExchangerEnd, 0, 0, 0, 0));
592: np = de->n_neighbour_procs;
593: PetscCall(PetscMalloc1(np + 1, &message_recv_offsets));
594: message_recv_offsets[0] = 0;
595: total = de->messages_to_be_recvieved[0];
596: for (i = 1; i < np; ++i) {
597: message_recv_offsets[i] = total;
598: total = total + de->messages_to_be_recvieved[i];
599: }
600: /* == NON BLOCKING == */
601: for (i = 0; i < np; ++i) {
602: dest = ((char *)de->recv_message) + de->unit_message_size * message_recv_offsets[i];
603: PetscCallMPI(MPIU_Irecv(dest, de->messages_to_be_recvieved[i] * de->unit_message_size, MPI_CHAR, de->neighbour_procs[i], de->recv_tags[i], de->comm, &de->_requests[np + i]));
604: }
605: PetscCallMPI(MPI_Waitall(2 * np, de->_requests, de->_stats));
606: PetscCall(PetscFree(message_recv_offsets));
607: de->communication_status = DEOBJECT_FINALIZED;
608: PetscCall(PetscLogEventEnd(DMSWARM_DataExchangerEnd, 0, 0, 0, 0));
609: PetscFunctionReturn(PETSC_SUCCESS);
610: }
612: PetscErrorCode DMSwarmDataExGetSendData(DMSwarmDataEx de, PetscInt *length, void **send)
613: {
614: PetscFunctionBegin;
615: PetscCheck(de->packer_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ARG_WRONGSTATE, "Data has not finished being packed.");
616: *length = de->send_message_length;
617: *send = de->send_message;
618: PetscFunctionReturn(PETSC_SUCCESS);
619: }
621: PetscErrorCode DMSwarmDataExGetRecvData(DMSwarmDataEx de, PetscInt *length, void **recv)
622: {
623: PetscFunctionBegin;
624: PetscCheck(de->communication_status == DEOBJECT_FINALIZED, de->comm, PETSC_ERR_ARG_WRONGSTATE, "Data has not finished being sent.");
625: *length = de->recv_message_length;
626: *recv = de->recv_message;
627: PetscFunctionReturn(PETSC_SUCCESS);
628: }
630: PetscErrorCode DMSwarmDataExTopologyGetNeighbours(DMSwarmDataEx de, PetscMPIInt *n, PetscMPIInt *neigh[])
631: {
632: PetscFunctionBegin;
633: if (n) *n = de->n_neighbour_procs;
634: if (neigh) *neigh = de->neighbour_procs;
635: PetscFunctionReturn(PETSC_SUCCESS);
636: }