1 | /*! |
---|
2 | \file server_distribution_description.hpp |
---|
3 | \author Ha NGUYEN |
---|
4 | \since 04 Jan 2015 |
---|
5 | \date 11 Jan 2016 |
---|
6 | |
---|
7 | \brief Description of index distribution on server(s). |
---|
8 | */ |
---|
9 | |
---|
10 | #include "server_distribution_description.hpp" |
---|
11 | #include "exception.hpp" |
---|
12 | |
---|
13 | namespace xios |
---|
14 | { |
---|
15 | /*! |
---|
16 | \param [in] globalDimensionSize global dimension of grid |
---|
17 | \param [in] nServer number of server |
---|
18 | \param [in] serType type of server distribution. For now, we can distribute server by band or plan |
---|
19 | */ |
---|
20 | CServerDistributionDescription::CServerDistributionDescription(const std::vector<int>& globalDimensionSize, |
---|
21 | int nServer, |
---|
22 | ServerDistributionType serType) |
---|
23 | : nGlobal_(globalDimensionSize), indexBegin_(), dimensionSizes_(), globalIndex_(), |
---|
24 | vecGlobalIndex_(), serverType_(serType), nServer_(nServer), positionDimensionDistributed_(1) |
---|
25 | { |
---|
26 | } |
---|
27 | |
---|
28 | CServerDistributionDescription::~CServerDistributionDescription() |
---|
29 | { /* Nothing to do */ } |
---|
30 | |
---|
31 | int CServerDistributionDescription::defaultDistributedDimension(int gridDimension, |
---|
32 | ServerDistributionType serType) |
---|
33 | { |
---|
34 | switch (serType) |
---|
35 | { |
---|
36 | case BAND_DISTRIBUTION: |
---|
37 | return ((1 == gridDimension) ? 0 : 1); |
---|
38 | break; |
---|
39 | default: |
---|
40 | break; |
---|
41 | } |
---|
42 | } |
---|
43 | |
---|
44 | /*! |
---|
45 | Compute pre-defined global index distribution of server(s). |
---|
46 | \param [in] doComputeGlobalIndex flag to compute global index on each server. By default, false |
---|
47 | |
---|
48 | */ |
---|
49 | void CServerDistributionDescription::computeServerDistribution(bool doComputeGlobalIndex, |
---|
50 | int positionDimensionDistributed) |
---|
51 | { |
---|
52 | switch (serverType_) { |
---|
53 | case BAND_DISTRIBUTION: |
---|
54 | computeBandDistribution(nServer_, positionDimensionDistributed); |
---|
55 | break; |
---|
56 | default: |
---|
57 | break; |
---|
58 | } |
---|
59 | |
---|
60 | if (doComputeGlobalIndex) |
---|
61 | { |
---|
62 | vecGlobalIndex_.resize(nServer_); |
---|
63 | int dim = nGlobal_.size(); |
---|
64 | std::vector<int> currentIndex(dim); |
---|
65 | |
---|
66 | for (int idxServer = 0; idxServer < nServer_; ++idxServer) |
---|
67 | { |
---|
68 | size_t ssize = 1, idx = 0; |
---|
69 | for (int j = 0; j < dim; ++j) ssize *= dimensionSizes_[idxServer][j]; |
---|
70 | vecGlobalIndex_[idxServer].resize(ssize); |
---|
71 | |
---|
72 | std::vector<int> idxLoop(dim,0); |
---|
73 | |
---|
74 | int innerLoopSize = dimensionSizes_[idxServer][0]; |
---|
75 | |
---|
76 | while (idx<ssize) |
---|
77 | { |
---|
78 | for (int idxDim = 0; idxDim < dim-1; ++idxDim) |
---|
79 | { |
---|
80 | if (idxLoop[idxDim] == dimensionSizes_[idxServer][idxDim]) |
---|
81 | { |
---|
82 | idxLoop[idxDim] = 0; |
---|
83 | ++idxLoop[idxDim+1]; |
---|
84 | } |
---|
85 | } |
---|
86 | |
---|
87 | for (int idxDim = 1; idxDim < dim; ++idxDim) currentIndex[idxDim] = idxLoop[idxDim] + indexBegin_[idxServer][idxDim]; |
---|
88 | |
---|
89 | size_t mulDim, globalIndex; |
---|
90 | for (int j = 0; j < innerLoopSize; ++j) |
---|
91 | { |
---|
92 | mulDim = 1; |
---|
93 | globalIndex = j + indexBegin_[idxServer][0]; |
---|
94 | |
---|
95 | for (int k = 1; k < dim; ++k) |
---|
96 | { |
---|
97 | mulDim *= nGlobal_[k-1]; |
---|
98 | globalIndex += currentIndex[k] * mulDim; |
---|
99 | } |
---|
100 | vecGlobalIndex_[idxServer](idx) = globalIndex; |
---|
101 | ++idx; |
---|
102 | } |
---|
103 | idxLoop[0] += innerLoopSize; |
---|
104 | } |
---|
105 | } |
---|
106 | } |
---|
107 | } |
---|
108 | |
---|
109 | /*! |
---|
110 | Compute global index assigned to a server with a range.E.g: if a grid has 100 points and |
---|
111 | there are 2 servers, the first one takes index from 0 to 49, the second has index from 50 to 99 |
---|
112 | \param [in] indexBeginEnd begining and ending index of range |
---|
113 | \param [in] positionDimensionDistributed dimension of server on which we make the cut. |
---|
114 | */ |
---|
115 | std::vector<int> CServerDistributionDescription::computeServerGlobalIndexInRange(const std::pair<size_t, size_t>& indexBeginEnd, |
---|
116 | int positionDimensionDistributed) |
---|
117 | { |
---|
118 | int nBand = 0; |
---|
119 | switch (serverType_) { |
---|
120 | case BAND_DISTRIBUTION: |
---|
121 | nBand = computeBandDistribution(nServer_, positionDimensionDistributed); |
---|
122 | break; |
---|
123 | default: |
---|
124 | break; |
---|
125 | } |
---|
126 | |
---|
127 | size_t indexBegin = indexBeginEnd.first; |
---|
128 | size_t indexEnd = indexBeginEnd.second; |
---|
129 | if (indexBegin > indexEnd) |
---|
130 | ERROR("CServerDistributionDescription::computeServerGlobalIndexInRange", |
---|
131 | << "Index begin is larger than index end"); |
---|
132 | |
---|
133 | globalIndex_.rehash(std::ceil((indexEnd-indexBegin+1)/globalIndex_.max_load_factor())); |
---|
134 | |
---|
135 | int dim = nGlobal_.size(); |
---|
136 | std::vector<int> currentIndex(dim); |
---|
137 | |
---|
138 | for (int idxServer = 0; idxServer < nBand; ++idxServer) |
---|
139 | { |
---|
140 | size_t ssize = 1, idx = 0; |
---|
141 | for (int j = 0; j < dim; ++j) ssize *= dimensionSizes_[idxServer][j]; |
---|
142 | |
---|
143 | std::vector<int> idxLoop(dim,0); |
---|
144 | int innerLoopSize = dimensionSizes_[idxServer][0]; |
---|
145 | |
---|
146 | while (idx<ssize) |
---|
147 | { |
---|
148 | for (int idxDim = 0; idxDim < dim-1; ++idxDim) |
---|
149 | { |
---|
150 | if (idxLoop[idxDim] == dimensionSizes_[idxServer][idxDim]) |
---|
151 | { |
---|
152 | idxLoop[idxDim] = 0; |
---|
153 | ++idxLoop[idxDim+1]; |
---|
154 | } |
---|
155 | } |
---|
156 | |
---|
157 | for (int idxDim = 1; idxDim < dim; ++idxDim) currentIndex[idxDim] = idxLoop[idxDim] + indexBegin_[idxServer][idxDim]; |
---|
158 | |
---|
159 | size_t mulDim, globalIndex; |
---|
160 | for (int j = 0; j < innerLoopSize; ++j) |
---|
161 | { |
---|
162 | mulDim = 1; |
---|
163 | globalIndex = j + indexBegin_[idxServer][0]; |
---|
164 | |
---|
165 | for (int k = 1; k < dim; ++k) |
---|
166 | { |
---|
167 | mulDim *= nGlobal_[k-1]; |
---|
168 | globalIndex += (currentIndex[k])*mulDim; |
---|
169 | } |
---|
170 | if ((indexBegin <= globalIndex) && (globalIndex <= indexEnd)) |
---|
171 | globalIndex_[globalIndex] = idxServer; |
---|
172 | ++idx; |
---|
173 | } |
---|
174 | idxLoop[0] += innerLoopSize; |
---|
175 | } |
---|
176 | } |
---|
177 | |
---|
178 | // List of servers without distribution (cause total number of server is greater than number of bands, for example) |
---|
179 | std::vector<int> zeroIndexServer(nServer_-nBand); |
---|
180 | for (int idxServer = nBand; idxServer < nServer_; ++idxServer) |
---|
181 | zeroIndexServer[idxServer-nBand] = idxServer; |
---|
182 | |
---|
183 | return zeroIndexServer; |
---|
184 | } |
---|
185 | |
---|
186 | /*! |
---|
187 | Compute the global index of grid elements (domain, axis) and their associated server rank. |
---|
188 | Each client knows the general distribution of servers and from which they can compute the pieces of information to hold |
---|
189 | \param [out] indexServerOnElement global index of each element as well as the corresponding server which contains these indices |
---|
190 | \param [in] clientRank rank of client |
---|
191 | \param [in] clientSize number of client |
---|
192 | \param [in] axisDomainOrder the order of element in grid (2 for domain, 1 for axis, 0 for scalar) |
---|
193 | \param [in] positionDimensionDistributed dimension of server on which we make the cut. |
---|
194 | */ |
---|
195 | std::vector<int> CServerDistributionDescription::computeServerGlobalByElement(std::vector<boost::unordered_map<size_t,std::vector<int> > >& indexServerOnElement, |
---|
196 | int clientRank, |
---|
197 | int clientSize, |
---|
198 | const CArray<int,1>& axisDomainOrder, |
---|
199 | int positionDimensionDistributed) |
---|
200 | { |
---|
201 | int nBand = 0; |
---|
202 | switch (serverType_) { |
---|
203 | case BAND_DISTRIBUTION: |
---|
204 | nBand = computeBandDistribution(nServer_, positionDimensionDistributed); |
---|
205 | break; |
---|
206 | default: |
---|
207 | break; |
---|
208 | } |
---|
209 | |
---|
210 | int nbElement = axisDomainOrder.numElements(); |
---|
211 | indexServerOnElement.resize(nbElement); |
---|
212 | int idx = 0; |
---|
213 | std::vector<int> idxMap(nbElement); |
---|
214 | for (int i = 0; i < nbElement; ++i) |
---|
215 | { |
---|
216 | idxMap[i] = idx; |
---|
217 | if (2 == axisDomainOrder(i)) idx += 2; |
---|
218 | else ++idx; |
---|
219 | } |
---|
220 | |
---|
221 | for (int idxServer = 0; idxServer < nBand; ++idxServer) |
---|
222 | { |
---|
223 | std::vector<int> elementDimension(4); |
---|
224 | for (int i = 0; i < nbElement; ++i) |
---|
225 | { |
---|
226 | int elementSize = 1; |
---|
227 | if (2 == axisDomainOrder(i)) |
---|
228 | { |
---|
229 | elementSize *= dimensionSizes_[idxServer][idxMap[i]] * dimensionSizes_[idxServer][idxMap[i]+1]; |
---|
230 | elementDimension[0] = indexBegin_[idxServer][idxMap[i]]; |
---|
231 | elementDimension[1] = indexBegin_[idxServer][idxMap[i]+1]; |
---|
232 | elementDimension[2] = dimensionSizes_[idxServer][idxMap[i]]; |
---|
233 | elementDimension[3] = dimensionSizes_[idxServer][idxMap[i]+1]; |
---|
234 | } |
---|
235 | |
---|
236 | else if (1 == axisDomainOrder(i)) |
---|
237 | { |
---|
238 | elementSize *= dimensionSizes_[idxServer][idxMap[i]]; |
---|
239 | elementDimension[0] = indexBegin_[idxServer][idxMap[i]]; |
---|
240 | elementDimension[1] = 0; |
---|
241 | elementDimension[2] = dimensionSizes_[idxServer][idxMap[i]]; |
---|
242 | elementDimension[3] = 1; |
---|
243 | } |
---|
244 | else |
---|
245 | { |
---|
246 | elementSize *= dimensionSizes_[idxServer][idxMap[i]]; |
---|
247 | elementDimension[0] = 0; |
---|
248 | elementDimension[1] = 0; |
---|
249 | elementDimension[2] = 1; |
---|
250 | elementDimension[3] = 1; |
---|
251 | } |
---|
252 | |
---|
253 | int rangeBegin, rangeSize; |
---|
254 | computeRangeProcIndex(clientRank, clientSize, elementSize, rangeBegin, rangeSize); |
---|
255 | |
---|
256 | size_t globalIndexElement; |
---|
257 | idx = 0; int idxRange = 0; |
---|
258 | for (int k = 0; k < elementDimension[3]; ++k) |
---|
259 | for (int l = 0; l < elementDimension[2]; ++l) |
---|
260 | { |
---|
261 | globalIndexElement = (l+elementDimension[0]) + (k+elementDimension[1])*elementDimension[2]; |
---|
262 | if ((rangeBegin <= idx) && (idxRange < rangeSize)) |
---|
263 | { |
---|
264 | indexServerOnElement[i][globalIndexElement].push_back(idxServer); |
---|
265 | ++idxRange; |
---|
266 | } |
---|
267 | ++idx; |
---|
268 | } |
---|
269 | } |
---|
270 | } |
---|
271 | |
---|
272 | // List of servers without distribution (cause total number of server is greater than number of bands, for example) |
---|
273 | std::vector<int> zeroIndexServer(nServer_-nBand); |
---|
274 | for (int idxServer = nBand; idxServer < nServer_; ++idxServer) |
---|
275 | zeroIndexServer[idxServer-nBand] = idxServer; |
---|
276 | |
---|
277 | return zeroIndexServer; |
---|
278 | } |
---|
279 | |
---|
280 | /*! |
---|
281 | Compute a range of index on server which a client holds |
---|
282 | For a range of index on a specific server, each client can hold a piece of the index range |
---|
283 | If the range size is smaller than the number of client, there are some clients holding the same index |
---|
284 | \param [in] clientRank rank of client |
---|
285 | \param [in] clientSize number of client |
---|
286 | \param [in] rangeProcSize index range size |
---|
287 | \param [out] rangeBegin begin of range index a client holds |
---|
288 | \param [out] rangeSize size of range index a client holds |
---|
289 | */ |
---|
290 | void CServerDistributionDescription::computeRangeProcIndex(int clientRank, |
---|
291 | int clientSize, |
---|
292 | int rangeProcSize, |
---|
293 | int& rangeBegin, |
---|
294 | int& rangeSize) |
---|
295 | { |
---|
296 | if (rangeProcSize < clientSize) |
---|
297 | { |
---|
298 | int rangeIndex = 0; |
---|
299 | for (int idx = 0; idx < clientSize; ++idx) |
---|
300 | { |
---|
301 | if (idx == clientRank) |
---|
302 | { |
---|
303 | rangeBegin = rangeIndex; |
---|
304 | rangeSize = 1; |
---|
305 | } |
---|
306 | ++rangeIndex; |
---|
307 | if (rangeIndex == rangeProcSize) rangeIndex = 0; |
---|
308 | } |
---|
309 | return; |
---|
310 | } |
---|
311 | |
---|
312 | int range, indexBegin = 0; |
---|
313 | for (int i = 0; i < clientSize; ++i) |
---|
314 | { |
---|
315 | range = rangeProcSize / clientSize; |
---|
316 | if (i < (rangeProcSize%clientSize)) ++range; |
---|
317 | if (i == clientRank) break; |
---|
318 | indexBegin += range; |
---|
319 | } |
---|
320 | rangeBegin = indexBegin; |
---|
321 | rangeSize = range; |
---|
322 | } |
---|
323 | |
---|
324 | /*! |
---|
325 | Compute global index of servers with band distribution |
---|
326 | \param [in] nServer number of server |
---|
327 | */ |
---|
328 | int CServerDistributionDescription::computeBandDistribution(int nServer, int positionDimensionDistributed) |
---|
329 | { |
---|
330 | int dim = nGlobal_.size(); |
---|
331 | positionDimensionDistributed_ = positionDimensionDistributed; |
---|
332 | if (1 == dim) positionDimensionDistributed_ = 0; |
---|
333 | if (positionDimensionDistributed_ > dim) |
---|
334 | ERROR("CServerDistributionDescription::computeBandDistribution(int nServer, int positionDimensionDistributed)", |
---|
335 | << "Position of distributed dimension is invalid" << std::endl |
---|
336 | << "Position of distributed dimension is " << positionDimensionDistributed_ |
---|
337 | << "Dimension " << dim) |
---|
338 | |
---|
339 | indexBegin_.resize(nServer); |
---|
340 | dimensionSizes_.resize(nServer); |
---|
341 | |
---|
342 | for (int i = 0; i< nServer; ++i) |
---|
343 | { |
---|
344 | indexBegin_[i].resize(dim); |
---|
345 | dimensionSizes_[i].resize(dim); |
---|
346 | } |
---|
347 | |
---|
348 | int njRangeSize; |
---|
349 | int nGlobTemp = 0; |
---|
350 | std::vector<int> njRangeBegin(nServer,0); |
---|
351 | std::vector<int> njRangeEnd(nServer,0); |
---|
352 | |
---|
353 | int positionDistributed = (1<dim) ? positionDimensionDistributed_ : 0; |
---|
354 | nGlobTemp = nGlobal_[positionDistributed]; |
---|
355 | int nbBand = std::min(nGlobTemp, nServer); |
---|
356 | |
---|
357 | for (int i = 0; i < nbBand; ++i) |
---|
358 | { |
---|
359 | if (0 < i) njRangeBegin[i] = njRangeEnd[i-1]; |
---|
360 | njRangeSize = nGlobTemp / nbBand; |
---|
361 | if (i < nGlobTemp%nbBand) ++njRangeSize; |
---|
362 | njRangeEnd[i] = njRangeSize + njRangeBegin[i]; |
---|
363 | } |
---|
364 | njRangeEnd[nbBand-1] = nGlobTemp; |
---|
365 | |
---|
366 | for (int i = nbBand; i < nServer; ++i) |
---|
367 | { |
---|
368 | njRangeBegin[i] = njRangeEnd[i] = 0; |
---|
369 | } |
---|
370 | |
---|
371 | for (int i = 0; i < nServer; ++i) |
---|
372 | { |
---|
373 | for (int j = 0; j < dim; ++j) |
---|
374 | { |
---|
375 | if (positionDistributed != j) |
---|
376 | { |
---|
377 | if (1 == dim) |
---|
378 | { |
---|
379 | indexBegin_[i][j] = njRangeBegin[i]; |
---|
380 | dimensionSizes_[i][j] = njRangeEnd[i] - njRangeBegin[i]; |
---|
381 | } |
---|
382 | else |
---|
383 | { |
---|
384 | indexBegin_[i][j] = 0; |
---|
385 | dimensionSizes_[i][j] = nGlobal_[j]; |
---|
386 | } |
---|
387 | } |
---|
388 | else |
---|
389 | { |
---|
390 | indexBegin_[i][j] = njRangeBegin[i]; |
---|
391 | dimensionSizes_[i][j] = njRangeEnd[i] - njRangeBegin[i]; |
---|
392 | } |
---|
393 | } |
---|
394 | } |
---|
395 | |
---|
396 | return nbBand; |
---|
397 | } |
---|
398 | |
---|
399 | /*! |
---|
400 | Get size of each dimension on distributed server |
---|
401 | \return size of dimensions on server(s) |
---|
402 | */ |
---|
403 | std::vector<std::vector<int> > CServerDistributionDescription::getServerDimensionSizes() const |
---|
404 | { |
---|
405 | return dimensionSizes_; |
---|
406 | } |
---|
407 | |
---|
408 | /*! |
---|
409 | Get index begin of each dimension on distributed server |
---|
410 | \return index begin of dimensions on server(s) |
---|
411 | */ |
---|
412 | std::vector<std::vector<int> > CServerDistributionDescription::getServerIndexBegin() const |
---|
413 | { |
---|
414 | return indexBegin_; |
---|
415 | } |
---|
416 | |
---|
417 | /*! |
---|
418 | Get global index on distributed server |
---|
419 | \return global index on server(s) |
---|
420 | */ |
---|
421 | const std::vector<CArray<size_t,1> >& CServerDistributionDescription::getGlobalIndex() const |
---|
422 | { |
---|
423 | return vecGlobalIndex_; |
---|
424 | } |
---|
425 | |
---|
426 | /*! |
---|
427 | Get global index calculated by computeServerGlobalIndexInRange |
---|
428 | */ |
---|
429 | const boost::unordered_map<size_t,int>& CServerDistributionDescription::getGlobalIndexRange() const |
---|
430 | { |
---|
431 | return globalIndex_; |
---|
432 | } |
---|
433 | |
---|
434 | int CServerDistributionDescription::getDimensionDistributed() |
---|
435 | { |
---|
436 | return ((1<nGlobal_.size()) ? positionDimensionDistributed_ : 0); |
---|
437 | } |
---|
438 | |
---|
439 | } // namespace xios |
---|