COMBINATORIAL_BLAS  1.6
BitMapCarousel.h
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1 /****************************************************************/
2 /* Parallel Combinatorial BLAS Library (for Graph Computations) */
3 /* version 1.4 -------------------------------------------------*/
4 /* date: 1/17/2014 ---------------------------------------------*/
5 /* authors: Aydin Buluc (abuluc@lbl.gov), Adam Lugowski --------*/
6 /* this file contributed by Scott Beamer of UC Berkeley --------*/
7 /****************************************************************/
8 /*
9  Copyright (c) 2010-2014, The Regents of the University of California
10 
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22  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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29 
30 
31 #ifndef BITMAPCAROUSEL_H
32 #define BITMAPCAROUSEL_H
33 
34 // #include <algorithm>
35 #include "BitMap.h"
36 #include "BitMapFringe.h"
37 #include "CommGrid.h"
38 
39 namespace combblas {
40 
41 template <class IT, class NT>
43  public:
44  BitMapCarousel(std::shared_ptr<CommGrid> grid, IT glen, int local_subword_disp) {
45  commGrid.reset(new CommGrid(*grid));
46  rotation_index = 0;
47  global_size = glen;
48  my_procrow = commGrid->GetRankInProcCol();
49  my_proccol = commGrid->GetRankInProcRow();
50  procrows = commGrid->GetGridRows();
51  proccols = commGrid->GetGridCols();
52  local_size = SizeOfChunk();
53  rotlenuntil = RotLengthUntil();
54  IT biggest_size = global_size - RotLengthUntil(procrows-1, proccols-1) + 63;
55  bm = new BitMap(biggest_size);
56  recv_buff = new BitMap(biggest_size);
57  old_bm = new BitMap(biggest_size);
58  sub_disps = new int[proccols];
59  sub_disps[my_proccol] = local_subword_disp;
60  MPI_Allgather(MPI_IN_PLACE, 1, MPI_INT, sub_disps, 1, MPI_INT, commGrid->GetRowWorld());
61  curr_subword_disp = local_subword_disp;
62  }
63 
65  delete bm;
66  delete recv_buff;
67  delete old_bm;
68  delete[] sub_disps;
69  }
70 
71  // Return the global index of the start of the local chunk (inclusive)
72  IT GetGlobalStartOfLocal() const {
73  return rotlenuntil;
74  }
75 
76  IT GetGlobalStartOfLocal(int col) const {
77  return RotLengthUntil(my_procrow,col);
78  }
79 
80  // Return the global index of the end of the local chunk (exclusive)
81  IT GetGlobalEndOfLocal() const {
82  return rotlenuntil + local_size;
83  }
84 
85  IT GetGlobalEndOfLocal(int col) const {
86  return GetGlobalStartOfLocal(col) + local_size;
87  }
88 
89  bool GetBit(IT index) const {
90  return bm->get_bit(index - rotlenuntil + curr_subword_disp);
91  }
92 
93  void SetBit(IT index) {
94  bm->set_bit(index - rotlenuntil + curr_subword_disp);
95  }
96 
97  template <class NT1>
99  bm->reset();
100  local_size = x.LocArrSize();
101  for (DenseVectorLocalIterator<IT,NT> it(x); it.HasNext(); it.Next())
102  if (it.GetValue() != -1)
103  bm->set_bit(it.GetLocIndex() + curr_subword_disp);
104  }
105 
107  int curr_col = (my_proccol + rotation_index) % proccols;
108  return RotLengthUntil(my_procrow, curr_col);
109  }
110 
111  IT RotLengthUntil(int my_procrow, int my_proccol) const {
112  IT n_perprocrow = global_size / procrows;
113  IT n_thisrow;
114  if(my_procrow == procrows-1)
115  n_thisrow = global_size - (n_perprocrow*(procrows-1));
116  else
117  n_thisrow = n_perprocrow;
118  IT n_perproc = n_thisrow / proccols;
119  return ((n_perprocrow * my_procrow)+(n_perproc*my_proccol));
120  }
121 
122  IT SizeOfChunk() const {
123  int curr_col = (my_proccol + rotation_index) % proccols;
124  return SizeOfChunk(my_procrow, curr_col);
125  }
126 
127  IT SizeOfChunk(int my_procrow, int my_proccol) const {
128  IT my_upper_limit;
129  if (my_proccol == (proccols-1)) {
130  if (my_procrow == (procrows-1)) {
131  my_upper_limit = global_size;
132  }else {
133  my_upper_limit = RotLengthUntil(my_procrow+1, 0);
134  }
135  } else {
136  my_upper_limit = RotLengthUntil(my_procrow, (my_proccol+1) % proccols);
137  }
138  return my_upper_limit - RotLengthUntil(my_procrow,my_proccol);
139  }
140 
141  void RotateAlongRow() {
142  int source = (my_proccol+1) % proccols;
143  int dest = (my_proccol+(proccols-1)) % proccols;
144  rotation_index = (rotation_index + 1) % proccols;
145  long send_words = (local_size + 63 + curr_subword_disp)>>6;
146  long recv_words = (SizeOfChunk() + 63 + sub_disps[(my_proccol+rotation_index)%proccols])>>6;
147 
148  MPI_Comm RowWorld = commGrid->GetRowWorld();
149  MPI_Status status;
150  MPI_Sendrecv(bm->data(), send_words, MPIType<uint64_t>(), dest, ROTATE,
151  recv_buff->data(), recv_words, MPIType<uint64_t>(), source, ROTATE, RowWorld, &status);
152 
153  local_size = SizeOfChunk();
154  rotlenuntil = RotLengthUntil();
155  std::swap(bm, recv_buff);
156  curr_subword_disp = sub_disps[(my_proccol+rotation_index)%proccols];
157  }
158 
160  uint64_t* dest = bm_fringe.AccessBM()->data();
161  uint64_t* curr = bm->data();
162  uint64_t* old = old_bm->data();
163  IT num_words = (local_size + 63 + curr_subword_disp) / 64;
164  for (IT i=0; i<num_words; i++) {
165  dest[i] = curr[i] ^ old[i];
166  }
167  }
168 
169  void SaveOld() {
170  old_bm->copy_from(bm);
171  }
172 
173 private:
174  std::shared_ptr<CommGrid> commGrid;
175  int rotation_index;
176  int my_procrow;
177  int my_proccol;
178  int procrows;
179  int proccols;
180  int curr_subword_disp;
181  IT rotlenuntil;
182  IT global_size;
183  IT local_size;
184  BitMap* bm;
185  BitMap* recv_buff;
186  BitMap* old_bm;
187  int* sub_disps;
188 };
189 
190 }
191 
192 #endif // BITMAPCAROUSEL_H
void copy_from(const BitMap *other)
Definition: BitMap.h:149
bool get_bit(uint64_t pos)
Definition: BitMap.h:106
#define ROTATE
Definition: SpDefs.h:108
MPI_Datatype MPIType< uint64_t >(void)
Definition: MPIType.cpp:68
uint64_t * data()
Definition: BitMap.h:145
void reset()
Definition: BitMap.h:79
Definition: CCGrid.h:4
void set_bit(uint64_t pos)
Definition: BitMap.h:85