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00014 #ifndef STXXL_KSORT_HEADER
00015 #define STXXL_KSORT_HEADER
00016
00017 #include <stxxl/bits/mng/mng.h>
00018 #include <stxxl/bits/common/rand.h>
00019 #include <stxxl/bits/mng/adaptor.h>
00020 #include <stxxl/bits/common/simple_vector.h>
00021 #include <stxxl/bits/common/switch.h>
00022 #include <stxxl/bits/mng/block_alloc_interleaved.h>
00023 #include <stxxl/bits/algo/intksort.h>
00024 #include <stxxl/bits/algo/adaptor.h>
00025 #include <stxxl/bits/algo/async_schedule.h>
00026 #include <stxxl/bits/mng/block_prefetcher.h>
00027 #include <stxxl/bits/mng/buf_writer.h>
00028 #include <stxxl/bits/algo/run_cursor.h>
00029 #include <stxxl/bits/algo/losertree.h>
00030 #include <stxxl/bits/algo/inmemsort.h>
00031 #include <stxxl/bits/algo/sort_base.h>
00032 #include <stxxl/bits/common/is_sorted.h>
00033 #include <stxxl/bits/common/utils.h>
00034
00035
00036
00037
00038 #define OPT_MERGING
00039
00040 __STXXL_BEGIN_NAMESPACE
00041
00044
00049
00052 namespace ksort_local
00053 {
00054 template <typename _BIDTp, typename _KeyTp>
00055 struct trigger_entry
00056 {
00057 typedef _BIDTp bid_type;
00058 typedef _KeyTp key_type;
00059
00060 bid_type bid;
00061 key_type key;
00062
00063 operator bid_type ()
00064 {
00065 return bid;
00066 }
00067 };
00068
00069
00070 template <typename _BIDTp, typename _KeyTp>
00071 inline bool operator < (const trigger_entry<_BIDTp, _KeyTp> & a,
00072 const trigger_entry<_BIDTp, _KeyTp> & b)
00073 {
00074 return (a.key < b.key);
00075 }
00076
00077 template <typename _BIDTp, typename _KeyTp>
00078 inline bool operator > (const trigger_entry<_BIDTp, _KeyTp> & a,
00079 const trigger_entry<_BIDTp, _KeyTp> & b)
00080 {
00081 return (a.key > b.key);
00082 }
00083
00084 template <typename type, typename key_type1>
00085 struct type_key
00086 {
00087 typedef key_type1 key_type;
00088 key_type key;
00089 type * ptr;
00090
00091 type_key() { }
00092 type_key(key_type k, type * p) : key(k), ptr(p)
00093 { }
00094 };
00095
00096 template <typename type, typename key1>
00097 bool operator < (const type_key<type, key1> & a, const type_key<type, key1> & b)
00098 {
00099 return a.key < b.key;
00100 }
00101
00102 template <typename type, typename key1>
00103 bool operator > (const type_key<type, key1> & a, const type_key<type, key1> & b)
00104 {
00105 return a.key > b.key;
00106 }
00107
00108
00109 template <typename block_type, typename bid_type>
00110 struct write_completion_handler
00111 {
00112 block_type * block;
00113 bid_type bid;
00114 request_ptr * req;
00115 void operator () (request * )
00116 {
00117 * req = block->read(bid);
00118 }
00119 };
00120
00121 template <typename type_key_,
00122 typename block_type,
00123 typename run_type,
00124 typename input_bid_iterator,
00125 typename key_extractor>
00126 inline void write_out(
00127 type_key_ * begin,
00128 type_key_ * end,
00129 block_type * & cur_blk,
00130 const block_type * end_blk,
00131 int_type & out_block,
00132 int_type & out_pos,
00133 run_type & run,
00134 write_completion_handler<block_type, typename block_type::bid_type> * & next_read,
00135 typename block_type::bid_type * & bids,
00136 request_ptr * write_reqs,
00137 request_ptr * read_reqs,
00138 input_bid_iterator & it,
00139 key_extractor keyobj)
00140 {
00141 typedef typename block_type::bid_type bid_type;
00142 typedef typename block_type::type type;
00143
00144 type * elem = cur_blk->elem;
00145 for (type_key_ * p = begin; p < end; p++)
00146 {
00147 elem[out_pos++] = *(p->ptr);
00148
00149 if (out_pos >= block_type::size)
00150 {
00151 run[out_block].key = keyobj(*(cur_blk->elem));
00152
00153 if (cur_blk < end_blk)
00154 {
00155 next_read->block = cur_blk;
00156 next_read->req = read_reqs + out_block;
00157 read_reqs[out_block] = NULL;
00158 bids[out_block] = next_read->bid = *(it++);
00159
00160 write_reqs[out_block] = cur_blk->write(
00161 run[out_block].bid,
00162
00163
00164 *(next_read++));
00165 }
00166 else
00167 {
00168 write_reqs[out_block] = cur_blk->write(run[out_block].bid);
00169 }
00170
00171 cur_blk++;
00172 elem = cur_blk->elem;
00173 out_block++;
00174 out_pos = 0;
00175 }
00176 }
00177 }
00178
00179 template <
00180 typename block_type,
00181 typename run_type,
00182 typename input_bid_iterator,
00183 typename key_extractor>
00184 void
00185 create_runs(
00186 input_bid_iterator it,
00187 run_type ** runs,
00188 const unsigned_type nruns,
00189 const unsigned_type m2,
00190 key_extractor keyobj)
00191 {
00192 typedef typename block_type::value_type type;
00193 typedef typename block_type::bid_type bid_type;
00194 typedef typename key_extractor::key_type key_type;
00195 typedef type_key<type, key_type> type_key_;
00196
00197 block_manager * bm = block_manager::get_instance();
00198 block_type * Blocks1 = new block_type[m2];
00199 block_type * Blocks2 = new block_type[m2];
00200 bid_type * bids = new bid_type[m2];
00201 type_key_ * refs1 = new type_key_[m2 * Blocks1->size];
00202 type_key_ * refs2 = new type_key_[m2 * Blocks1->size];
00203 request_ptr * read_reqs = new request_ptr[m2];
00204 request_ptr * write_reqs = new request_ptr[m2];
00205 write_completion_handler<block_type, bid_type> * next_run_reads =
00206 new write_completion_handler<block_type, bid_type>[m2];
00207
00208 run_type * run;
00209 run = *runs;
00210 int_type run_size = (*runs)->size();
00211 key_type offset = 0;
00212 const int log_k1 = log2_ceil((m2 * block_type::size * sizeof(type_key_) / STXXL_L2_SIZE) ?
00213 (m2 * block_type::size * sizeof(type_key_) / STXXL_L2_SIZE) : 2);
00214 const int log_k2 = log2_floor(m2 * Blocks1->size) - log_k1 - 1;
00215 STXXL_VERBOSE("log_k1: " << log_k1 << " log_k2:" << log_k2);
00216 const int_type k1 = 1 << log_k1;
00217 const int_type k2 = 1 << log_k2;
00218 int_type * bucket1 = new int_type[k1];
00219 int_type * bucket2 = new int_type[k2];
00220 int_type i;
00221
00222 disk_queues::get_instance()->set_priority_op(request_queue::WRITE);
00223
00224 for (i = 0; i < run_size; i++)
00225 {
00226 bids[i] = *(it++);
00227 read_reqs[i] = Blocks1[i].read(bids[i]);
00228 }
00229
00230 unsigned_type k = 0;
00231 const int shift1 = sizeof(key_type) * 8 - log_k1;
00232 const int shift2 = shift1 - log_k2;
00233 STXXL_VERBOSE("shift1: " << shift1 << " shift2:" << shift2);
00234
00235 for ( ; k < nruns; k++)
00236 {
00237 run = runs[k];
00238 run_size = run->size();
00239
00240 std::fill(bucket1, bucket1 + k1, 0);
00241
00242 type_key_ * ref_ptr = refs1;
00243 for (i = 0; i < run_size; i++)
00244 {
00245 if (k)
00246 write_reqs[i]->wait();
00247
00248 read_reqs[i]->wait();
00249 bm->delete_block(bids[i]);
00250
00251 classify_block(Blocks1[i].begin(), Blocks1[i].end(), ref_ptr, bucket1, offset, shift1, keyobj);
00252 }
00253
00254 exclusive_prefix_sum(bucket1, k1);
00255 classify(refs1, refs1 + run_size * Blocks1->size, refs2, bucket1,
00256 offset, shift1);
00257
00258 int_type out_block = 0;
00259 int_type out_pos = 0;
00260 unsigned_type next_run_size = (k < nruns - 1) ? (runs[k + 1]->size()) : 0;
00261
00262
00263 type_key_ * c = refs2;
00264 type_key_ * d = refs1;
00265 block_type * cur_blk = Blocks2;
00266 block_type * end_blk = Blocks2 + next_run_size;
00267 write_completion_handler<block_type, bid_type> * next_read = next_run_reads;
00268
00269 for (i = 0; i < k1; i++)
00270 {
00271 type_key_ * cEnd = refs2 + bucket1[i];
00272 type_key_ * dEnd = refs1 + bucket1[i];
00273
00274 l1sort(c, cEnd, d, bucket2, k2,
00275 offset + (key_type(1) << key_type(shift1)) * key_type(i), shift2);
00276
00277 write_out(
00278 d, dEnd, cur_blk, end_blk,
00279 out_block, out_pos, *run, next_read, bids,
00280 write_reqs, read_reqs, it, keyobj);
00281
00282 c = cEnd;
00283 d = dEnd;
00284 }
00285
00286 std::swap(Blocks1, Blocks2);
00287 }
00288
00289 wait_all(write_reqs, m2);
00290
00291 delete[] bucket1;
00292 delete[] bucket2;
00293 delete[] refs1;
00294 delete[] refs2;
00295 delete[] Blocks1;
00296 delete[] Blocks2;
00297 delete[] bids;
00298 delete[] next_run_reads;
00299 delete[] read_reqs;
00300 delete[] write_reqs;
00301 }
00302
00303 template <typename block_type,
00304 typename prefetcher_type,
00305 typename key_extractor>
00306 struct run_cursor2_cmp : public std::binary_function<run_cursor2<block_type, prefetcher_type>, run_cursor2<block_type, prefetcher_type>, bool>
00307 {
00308 typedef run_cursor2<block_type, prefetcher_type> cursor_type;
00309 key_extractor keyobj;
00310 run_cursor2_cmp(key_extractor keyobj_)
00311 {
00312 keyobj = keyobj_;
00313 }
00314 inline bool operator () (const cursor_type & a, const cursor_type & b) const
00315 {
00316 if (UNLIKELY(b.empty()))
00317 return true;
00318
00319 if (UNLIKELY(a.empty()))
00320 return false;
00321
00322
00323 return (keyobj(a.current()) < keyobj(b.current()));
00324 }
00325
00326 private:
00327 run_cursor2_cmp() { }
00328 };
00329
00330
00331 template <typename record_type, typename key_extractor>
00332 class key_comparison : public std::binary_function<record_type, record_type, bool>
00333 {
00334 key_extractor ke;
00335
00336 public:
00337 key_comparison() { }
00338 key_comparison(key_extractor ke_) : ke(ke_) { }
00339 bool operator () (const record_type & a, const record_type & b) const
00340 {
00341 return ke(a) < ke(b);
00342 }
00343 };
00344
00345
00346 template <typename block_type, typename run_type, typename key_ext_>
00347 bool check_ksorted_runs(run_type ** runs,
00348 unsigned_type nruns,
00349 unsigned_type m,
00350 key_ext_ keyext)
00351 {
00352 typedef typename block_type::value_type value_type;
00353
00354 STXXL_MSG("check_ksorted_runs Runs: " << nruns);
00355 unsigned_type irun = 0;
00356 for (irun = 0; irun < nruns; ++irun)
00357 {
00358 const unsigned_type nblocks_per_run = runs[irun]->size();
00359 unsigned_type blocks_left = nblocks_per_run;
00360 block_type * blocks = new block_type[m];
00361 request_ptr * reqs = new request_ptr[m];
00362 value_type last = keyext.min_value();
00363
00364 for (unsigned_type off = 0; off < nblocks_per_run; off += m)
00365 {
00366 const unsigned_type nblocks = STXXL_MIN(blocks_left, m);
00367 const unsigned_type nelements = nblocks * block_type::size;
00368 blocks_left -= nblocks;
00369
00370 for (unsigned_type j = 0; j < nblocks; ++j)
00371 {
00372 reqs[j] = blocks[j].read((*runs[irun])[off + j].bid);
00373 }
00374 wait_all(reqs, reqs + nblocks);
00375
00376 if (off && (keyext(blocks[0][0]) < keyext(last)))
00377 {
00378 STXXL_MSG("check_sorted_runs wrong first value in the run " << irun);
00379 STXXL_MSG(" first value: " << blocks[0][0] << " with key" << keyext(blocks[0][0]));
00380 STXXL_MSG(" last value: " << last << " with key" << keyext(last));
00381 for (unsigned_type k = 0; k < block_type::size; ++k)
00382 STXXL_MSG("Element " << k << " in the block is :" << blocks[0][k] << " key: " << keyext(blocks[0][k]));
00383 return false;
00384 }
00385
00386 for (unsigned_type j = 0; j < nblocks; ++j)
00387 {
00388 if (keyext(blocks[j][0]) != (*runs[irun])[off + j].key)
00389 {
00390 STXXL_MSG("check_sorted_runs wrong trigger in the run " << irun << " block " << (off + j));
00391 STXXL_MSG(" trigger value: " << (*runs[irun])[off + j].key);
00392 STXXL_MSG("Data in the block:");
00393 for (unsigned_type k = 0; k < block_type::size; ++k)
00394 STXXL_MSG("Element " << k << " in the block is :" << blocks[j][k] << " with key: " << keyext(blocks[j][k]));
00395
00396 STXXL_MSG("BIDS:");
00397 for (unsigned_type k = 0; k < nblocks; ++k)
00398 {
00399 if (k == j)
00400 STXXL_MSG("Bad one comes next.");
00401 STXXL_MSG("BID " << (off + k) << " is: " << ((*runs[irun])[off + k].bid));
00402 }
00403
00404 return false;
00405 }
00406 }
00407 if (!stxxl::is_sorted(make_element_iterator(blocks, 0),
00408 make_element_iterator(blocks, nelements),
00409 key_comparison<value_type, key_ext_>()))
00410 {
00411 STXXL_MSG("check_sorted_runs wrong order in the run " << irun);
00412 STXXL_MSG("Data in blocks:");
00413 for (unsigned_type j = 0; j < nblocks; ++j)
00414 {
00415 for (unsigned_type k = 0; k < block_type::size; ++k)
00416 STXXL_MSG(" Element " << k << " in block " << (off + j) << " is :" << blocks[j][k] << " with key: " << keyext(blocks[j][k]));
00417 }
00418 STXXL_MSG("BIDS:");
00419 for (unsigned_type k = 0; k < nblocks; ++k)
00420 {
00421 STXXL_MSG("BID " << (k + off) << " is: " << ((*runs[irun])[k + off].bid));
00422 }
00423
00424 return false;
00425 }
00426 last = blocks[nblocks - 1][block_type::size - 1];
00427 }
00428
00429 assert(blocks_left == 0);
00430 delete[] reqs;
00431 delete[] blocks;
00432 }
00433
00434 return true;
00435 }
00436
00437
00438 template <typename block_type, typename run_type, typename key_extractor>
00439 void merge_runs(run_type ** in_runs, unsigned_type nruns, run_type * out_run, unsigned_type _m, key_extractor keyobj)
00440 {
00441 typedef block_prefetcher<block_type, typename run_type::iterator> prefetcher_type;
00442 typedef run_cursor2<block_type, prefetcher_type> run_cursor_type;
00443
00444 unsigned_type i;
00445 run_type consume_seq(out_run->size());
00446
00447 int_type * prefetch_seq = new int_type[out_run->size()];
00448
00449 typename run_type::iterator copy_start = consume_seq.begin();
00450 for (i = 0; i < nruns; i++)
00451 {
00452
00453 copy_start = std::copy(
00454 in_runs[i]->begin(),
00455 in_runs[i]->end(),
00456 copy_start);
00457 }
00458 std::stable_sort(consume_seq.begin(), consume_seq.end() _STXXL_SORT_TRIGGER_FORCE_SEQUENTIAL);
00459
00460 unsigned disks_number = config::get_instance()->disks_number();
00461
00462 #ifdef PLAY_WITH_OPT_PREF
00463 const int_type n_write_buffers = 4 * disks_number;
00464 #else
00465 const int_type n_prefetch_buffers = STXXL_MAX(int_type(2 * disks_number), (3 * (int_type(_m) - int_type(nruns)) / 4));
00466 STXXL_VERBOSE("Prefetch buffers " << n_prefetch_buffers);
00467 const int_type n_write_buffers = STXXL_MAX(int_type(2 * disks_number), int_type(_m) - int_type(nruns) - int_type(n_prefetch_buffers));
00468 STXXL_VERBOSE("Write buffers " << n_write_buffers);
00469
00470 const int_type n_opt_prefetch_buffers = 2 * int_type(disks_number) + (3 * (int_type(n_prefetch_buffers) - int_type(2 * disks_number))) / 10;
00471 STXXL_VERBOSE("Prefetch buffers " << n_opt_prefetch_buffers);
00472 #endif
00473
00474 #if STXXL_SORT_OPTIMAL_PREFETCHING
00475 compute_prefetch_schedule(
00476 consume_seq,
00477 prefetch_seq,
00478 n_opt_prefetch_buffers,
00479 disks_number);
00480 #else
00481 for (i = 0; i < out_run->size(); i++)
00482 prefetch_seq[i] = i;
00483
00484 #endif
00485
00486
00487 prefetcher_type prefetcher(consume_seq.begin(),
00488 consume_seq.end(),
00489 prefetch_seq,
00490 nruns + n_prefetch_buffers);
00491
00492 buffered_writer<block_type> writer(n_write_buffers, n_write_buffers / 2);
00493
00494 unsigned_type out_run_size = out_run->size();
00495
00496 run_cursor2_cmp<block_type, prefetcher_type, key_extractor> cmp(keyobj);
00497 loser_tree<
00498 run_cursor_type,
00499 run_cursor2_cmp<block_type, prefetcher_type, key_extractor> >
00500 losers(&prefetcher, nruns, cmp);
00501
00502 block_type * out_buffer = writer.get_free_block();
00503
00504 for (i = 0; i < out_run_size; i++)
00505 {
00506 losers.multi_merge(out_buffer->elem, out_buffer->elem + block_type::size);
00507 (*out_run)[i].key = keyobj(out_buffer->elem[0]);
00508 out_buffer = writer.write(out_buffer, (*out_run)[i].bid);
00509 }
00510
00511 delete[] prefetch_seq;
00512
00513 block_manager * bm = block_manager::get_instance();
00514 for (i = 0; i < nruns; i++)
00515 {
00516 unsigned_type sz = in_runs[i]->size();
00517 for (unsigned_type j = 0; j < sz; j++)
00518 bm->delete_block((*in_runs[i])[j].bid);
00519
00520 delete in_runs[i];
00521 }
00522 }
00523
00524
00525 template <typename block_type,
00526 typename alloc_strategy,
00527 typename input_bid_iterator,
00528 typename key_extractor>
00529
00530 simple_vector<trigger_entry<typename block_type::bid_type, typename key_extractor::key_type> > *
00531 ksort_blocks(input_bid_iterator input_bids, unsigned_type _n, unsigned_type _m, key_extractor keyobj)
00532 {
00533 typedef typename block_type::value_type type;
00534 typedef typename key_extractor::key_type key_type;
00535 typedef typename block_type::bid_type bid_type;
00536 typedef trigger_entry<bid_type, typename key_extractor::key_type> trigger_entry_type;
00537 typedef simple_vector<trigger_entry_type> run_type;
00538 typedef typename interleaved_alloc_traits<alloc_strategy>::strategy interleaved_alloc_strategy;
00539
00540 unsigned_type m2 = div_ceil(_m, 2);
00541 const unsigned_type m2_rf = m2 * block_type::raw_size /
00542 (block_type::raw_size + block_type::size * sizeof(type_key<type, key_type>));
00543 STXXL_VERBOSE("Reducing number of blocks in a run from " << m2 << " to " <<
00544 m2_rf << " due to key size: " << sizeof(typename key_extractor::key_type) << " bytes");
00545 m2 = m2_rf;
00546 unsigned_type full_runs = _n / m2;
00547 unsigned_type partial_runs = ((_n % m2) ? 1 : 0);
00548 unsigned_type nruns = full_runs + partial_runs;
00549 unsigned_type i;
00550
00551 block_manager * mng = block_manager::get_instance();
00552
00553 STXXL_VERBOSE("n=" << _n << " nruns=" << nruns << "=" << full_runs << "+" << partial_runs);
00554
00555 double begin = timestamp(), after_runs_creation, end;
00556
00557 run_type ** runs = new run_type *[nruns];
00558
00559 for (i = 0; i < full_runs; i++)
00560 runs[i] = new run_type(m2);
00561
00562
00563 #ifdef INTERLEAVED_ALLOC
00564 if (partial_runs)
00565 {
00566 unsigned_type last_run_size = _n - full_runs * m2;
00567 runs[i] = new run_type(last_run_size);
00568
00569 mng->new_blocks(interleaved_alloc_strategy(nruns, alloc_strategy()),
00570 RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>
00571 (runs, 0, nruns, last_run_size),
00572 RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>
00573 (runs, _n, nruns, last_run_size));
00574 }
00575 else
00576 mng->new_blocks(interleaved_alloc_strategy(nruns, alloc_strategy()),
00577 RunsToBIDArrayAdaptor<block_type::raw_size, run_type>
00578 (runs, 0, nruns),
00579 RunsToBIDArrayAdaptor<block_type::raw_size, run_type>
00580 (runs, _n, nruns));
00581
00582 #else
00583 if (partial_runs)
00584 runs[i] = new run_type(_n - full_runs * m2);
00585
00586 for (i = 0; i < nruns; i++)
00587 {
00588 mng->new_blocks(alloc_strategy(), make_bid_iterator(runs[i]->begin()), make_bid_iterator(runs[i]->end()));
00589 }
00590 #endif
00591
00592 create_runs<block_type,
00593 run_type,
00594 input_bid_iterator,
00595 key_extractor>(input_bids, runs, nruns, m2, keyobj);
00596
00597 after_runs_creation = timestamp();
00598
00599 double io_wait_after_rf = stats::get_instance()->get_io_wait_time();
00600
00601 disk_queues::get_instance()->set_priority_op(request_queue::WRITE);
00602
00603 const int_type merge_factor = optimal_merge_factor(nruns, _m);
00604 run_type ** new_runs;
00605
00606 while (nruns > 1)
00607 {
00608 int_type new_nruns = div_ceil(nruns, merge_factor);
00609 STXXL_VERBOSE("Starting new merge phase: nruns: " << nruns <<
00610 " opt_merge_factor: " << merge_factor << " m:" << _m << " new_nruns: " << new_nruns);
00611
00612 new_runs = new run_type *[new_nruns];
00613
00614 int_type runs_left = nruns;
00615 int_type cur_out_run = 0;
00616 int_type blocks_in_new_run = 0;
00617
00618 while (runs_left > 0)
00619 {
00620 int_type runs2merge = STXXL_MIN(runs_left, merge_factor);
00621 blocks_in_new_run = 0;
00622 for (unsigned_type i = nruns - runs_left; i < (nruns - runs_left + runs2merge); i++)
00623 blocks_in_new_run += runs[i]->size();
00624
00625
00626 new_runs[cur_out_run++] = new run_type(blocks_in_new_run);
00627 runs_left -= runs2merge;
00628 }
00629
00630 if (cur_out_run == 1 && blocks_in_new_run == int_type(_n) && !input_bids->is_managed())
00631 {
00632
00633 input_bid_iterator cur = input_bids;
00634 for (int_type i = 0; cur != (input_bids + _n); ++cur)
00635 {
00636 (*new_runs[0])[i++].bid = *cur;
00637 }
00638
00639 bid_type & firstBID = (*new_runs[0])[0].bid;
00640 if (firstBID.is_managed())
00641 {
00642
00643
00644 mng->new_block(FR(), firstBID);
00645 }
00646 bid_type & lastBID = (*new_runs[0])[_n - 1].bid;
00647 if (lastBID.is_managed())
00648 {
00649
00650
00651 mng->new_block(FR(), lastBID);
00652 }
00653 }
00654 else
00655 {
00656 mng->new_blocks(interleaved_alloc_strategy(new_nruns, alloc_strategy()),
00657 RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>(new_runs, 0, new_nruns, blocks_in_new_run),
00658 RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>(new_runs, _n, new_nruns, blocks_in_new_run));
00659 }
00660
00661
00662
00663 runs_left = nruns;
00664 cur_out_run = 0;
00665 while (runs_left > 0)
00666 {
00667 int_type runs2merge = STXXL_MIN(runs_left, merge_factor);
00668 #if STXXL_CHECK_ORDER_IN_SORTS
00669 assert((check_ksorted_runs<block_type, run_type, key_extractor>(runs + nruns - runs_left, runs2merge, m2, keyobj)));
00670 #endif
00671 STXXL_VERBOSE("Merging " << runs2merge << " runs");
00672 merge_runs<block_type, run_type, key_extractor>(runs + nruns - runs_left,
00673 runs2merge, *(new_runs + (cur_out_run++)), _m, keyobj);
00674 runs_left -= runs2merge;
00675 }
00676
00677 nruns = new_nruns;
00678 delete[] runs;
00679 runs = new_runs;
00680 }
00681
00682 run_type * result = *runs;
00683 delete[] runs;
00684
00685 end = timestamp();
00686
00687 STXXL_VERBOSE("Elapsed time : " << end - begin << " s. Run creation time: " <<
00688 after_runs_creation - begin << " s");
00689 STXXL_VERBOSE("Time in I/O wait(rf): " << io_wait_after_rf << " s");
00690 STXXL_VERBOSE(*stats::get_instance());
00691 STXXL_UNUSED(begin + after_runs_creation + end + io_wait_after_rf);
00692
00693 return result;
00694 }
00695 }
00696
00697
00736
00737
00738
00739
00740
00741
00742 template <typename ExtIterator_, typename KeyExtractor_>
00743 void ksort(ExtIterator_ first_, ExtIterator_ last_, KeyExtractor_ keyobj, unsigned_type M__)
00744 {
00745 typedef simple_vector<ksort_local::trigger_entry<typename ExtIterator_::bid_type,
00746 typename KeyExtractor_::key_type> > run_type;
00747 typedef typename ExtIterator_::vector_type::value_type value_type;
00748 typedef typename ExtIterator_::block_type block_type;
00749
00750
00751 unsigned_type n = 0;
00752 block_manager * mng = block_manager::get_instance();
00753
00754 first_.flush();
00755
00756 if ((last_ - first_) * sizeof(value_type) < M__)
00757 {
00758 stl_in_memory_sort(first_, last_, ksort_local::key_comparison<value_type, KeyExtractor_>(keyobj));
00759 }
00760 else
00761 {
00762 assert(2 * block_type::raw_size <= M__);
00763
00764 if (first_.block_offset())
00765 {
00766 if (last_.block_offset())
00767
00768 {
00769 typename ExtIterator_::block_type * first_block = new typename ExtIterator_::block_type;
00770 typename ExtIterator_::block_type * last_block = new typename ExtIterator_::block_type;
00771 typename ExtIterator_::bid_type first_bid, last_bid;
00772 request_ptr req;
00773
00774 req = first_block->read(*first_.bid());
00775 mng->new_block(FR(), first_bid);
00776 mng->new_block(FR(), last_bid);
00777 req->wait();
00778
00779
00780 req = last_block->read(*last_.bid());
00781
00782 unsigned_type i = 0;
00783 for ( ; i < first_.block_offset(); i++)
00784 {
00785 first_block->elem[i] = keyobj.min_value();
00786 }
00787
00788 req->wait();
00789
00790 req = first_block->write(first_bid);
00791 for (i = last_.block_offset(); i < block_type::size; i++)
00792 {
00793 last_block->elem[i] = keyobj.max_value();
00794 }
00795
00796 req->wait();
00797
00798 req = last_block->write(last_bid);
00799
00800 n = last_.bid() - first_.bid() + 1;
00801
00802 std::swap(first_bid, *first_.bid());
00803 std::swap(last_bid, *last_.bid());
00804
00805 req->wait();
00806
00807 delete first_block;
00808 delete last_block;
00809
00810 run_type * out =
00811 ksort_local::ksort_blocks<
00812 typename ExtIterator_::block_type,
00813 typename ExtIterator_::vector_type::alloc_strategy_type,
00814 typename ExtIterator_::bids_container_iterator,
00815 KeyExtractor_>
00816 (first_.bid(), n, M__ / block_type::raw_size, keyobj);
00817
00818
00819 first_block = new typename ExtIterator_::block_type;
00820 last_block = new typename ExtIterator_::block_type;
00821 typename ExtIterator_::block_type * sorted_first_block = new typename ExtIterator_::block_type;
00822 typename ExtIterator_::block_type * sorted_last_block = new typename ExtIterator_::block_type;
00823 request_ptr * reqs = new request_ptr[2];
00824
00825 reqs[0] = first_block->read(first_bid);
00826 reqs[1] = sorted_first_block->read((*(out->begin())).bid);
00827 wait_all(reqs, 2);
00828
00829 reqs[0] = last_block->read(last_bid);
00830 reqs[1] = sorted_last_block->read(((*out)[out->size() - 1]).bid);
00831
00832 for (i = first_.block_offset(); i < block_type::size; i++)
00833 {
00834 first_block->elem[i] = sorted_first_block->elem[i];
00835 }
00836 wait_all(reqs, 2);
00837
00838 req = first_block->write(first_bid);
00839
00840 for (i = 0; i < last_.block_offset(); i++)
00841 {
00842 last_block->elem[i] = sorted_last_block->elem[i];
00843 }
00844
00845 req->wait();
00846
00847
00848 req = last_block->write(last_bid);
00849
00850 mng->delete_block(out->begin()->bid);
00851 mng->delete_block((*out)[out->size() - 1].bid);
00852
00853 *first_.bid() = first_bid;
00854 *last_.bid() = last_bid;
00855
00856 typename run_type::iterator it = out->begin();
00857 it++;
00858 typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
00859 cur_bid++;
00860
00861 for ( ; cur_bid != last_.bid(); cur_bid++, it++)
00862 {
00863 *cur_bid = (*it).bid;
00864 }
00865
00866 delete first_block;
00867 delete sorted_first_block;
00868 delete sorted_last_block;
00869 delete[] reqs;
00870 delete out;
00871
00872 req->wait();
00873
00874 delete last_block;
00875 }
00876 else
00877 {
00878
00879
00880
00881 typename ExtIterator_::block_type * first_block = new typename ExtIterator_::block_type;
00882 typename ExtIterator_::bid_type first_bid;
00883 request_ptr req;
00884
00885 req = first_block->read(*first_.bid());
00886 mng->new_block(FR(), first_bid);
00887 req->wait();
00888
00889
00890 unsigned_type i = 0;
00891 for ( ; i < first_.block_offset(); i++)
00892 {
00893 first_block->elem[i] = keyobj.min_value();
00894 }
00895
00896 req = first_block->write(first_bid);
00897
00898 n = last_.bid() - first_.bid();
00899
00900 std::swap(first_bid, *first_.bid());
00901
00902 req->wait();
00903
00904 delete first_block;
00905
00906 run_type * out =
00907 ksort_local::ksort_blocks<
00908 typename ExtIterator_::block_type,
00909 typename ExtIterator_::vector_type::alloc_strategy_type,
00910 typename ExtIterator_::bids_container_iterator,
00911 KeyExtractor_>
00912 (first_.bid(), n, M__ / block_type::raw_size, keyobj);
00913
00914
00915 first_block = new typename ExtIterator_::block_type;
00916
00917 typename ExtIterator_::block_type * sorted_first_block = new typename ExtIterator_::block_type;
00918
00919 request_ptr * reqs = new request_ptr[2];
00920
00921 reqs[0] = first_block->read(first_bid);
00922 reqs[1] = sorted_first_block->read((*(out->begin())).bid);
00923 wait_all(reqs, 2);
00924
00925 for (i = first_.block_offset(); i < block_type::size; i++)
00926 {
00927 first_block->elem[i] = sorted_first_block->elem[i];
00928 }
00929
00930 req = first_block->write(first_bid);
00931
00932 mng->delete_block(out->begin()->bid);
00933
00934 *first_.bid() = first_bid;
00935
00936 typename run_type::iterator it = out->begin();
00937 it++;
00938 typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
00939 cur_bid++;
00940
00941 for ( ; cur_bid != last_.bid(); cur_bid++, it++)
00942 {
00943 *cur_bid = (*it).bid;
00944 }
00945
00946 *cur_bid = (*it).bid;
00947
00948 delete sorted_first_block;
00949 delete[] reqs;
00950 delete out;
00951
00952 req->wait();
00953
00954 delete first_block;
00955 }
00956 }
00957 else
00958 {
00959 if (last_.block_offset())
00960
00961 {
00962 typename ExtIterator_::block_type * last_block = new typename ExtIterator_::block_type;
00963 typename ExtIterator_::bid_type last_bid;
00964 request_ptr req;
00965 unsigned_type i;
00966
00967 req = last_block->read(*last_.bid());
00968 mng->new_block(FR(), last_bid);
00969 req->wait();
00970
00971 for (i = last_.block_offset(); i < block_type::size; i++)
00972 {
00973 last_block->elem[i] = keyobj.max_value();
00974 }
00975
00976 req = last_block->write(last_bid);
00977
00978 n = last_.bid() - first_.bid() + 1;
00979
00980 std::swap(last_bid, *last_.bid());
00981
00982 req->wait();
00983
00984 delete last_block;
00985
00986 run_type * out =
00987 ksort_local::ksort_blocks<
00988 typename ExtIterator_::block_type,
00989 typename ExtIterator_::vector_type::alloc_strategy_type,
00990 typename ExtIterator_::bids_container_iterator,
00991 KeyExtractor_>
00992 (first_.bid(), n, M__ / block_type::raw_size, keyobj);
00993
00994
00995 last_block = new typename ExtIterator_::block_type;
00996 typename ExtIterator_::block_type * sorted_last_block = new typename ExtIterator_::block_type;
00997 request_ptr * reqs = new request_ptr[2];
00998
00999 reqs[0] = last_block->read(last_bid);
01000 reqs[1] = sorted_last_block->read(((*out)[out->size() - 1]).bid);
01001 wait_all(reqs, 2);
01002
01003 for (i = 0; i < last_.block_offset(); i++)
01004 {
01005 last_block->elem[i] = sorted_last_block->elem[i];
01006 }
01007
01008 req = last_block->write(last_bid);
01009
01010 mng->delete_block((*out)[out->size() - 1].bid);
01011
01012 *last_.bid() = last_bid;
01013
01014 typename run_type::iterator it = out->begin();
01015 typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
01016
01017 for ( ; cur_bid != last_.bid(); cur_bid++, it++)
01018 {
01019 *cur_bid = (*it).bid;
01020 }
01021
01022 delete sorted_last_block;
01023 delete[] reqs;
01024 delete out;
01025
01026 req->wait();
01027
01028 delete last_block;
01029 }
01030 else
01031 {
01032
01033 n = last_.bid() - first_.bid();
01034
01035 run_type * out =
01036 ksort_local::ksort_blocks<
01037 typename ExtIterator_::block_type,
01038 typename ExtIterator_::vector_type::alloc_strategy_type,
01039 typename ExtIterator_::bids_container_iterator,
01040 KeyExtractor_>
01041 (first_.bid(), n, M__ / block_type::raw_size, keyobj);
01042
01043 typename run_type::iterator it = out->begin();
01044 typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
01045
01046 for ( ; cur_bid != last_.bid(); cur_bid++, it++)
01047 {
01048 *cur_bid = (*it).bid;
01049 }
01050
01051 delete out;
01052 }
01053 }
01054 }
01055
01056 #if STXXL_CHECK_ORDER_IN_SORTS
01057 typedef typename ExtIterator_::const_iterator const_iterator;
01058 assert(stxxl::is_sorted(const_iterator(first_), const_iterator(last_),
01059 ksort_local::key_comparison<value_type, KeyExtractor_>()));
01060 #endif
01061 }
01062
01063 template <typename record_type>
01064 struct ksort_defaultkey
01065 {
01066 typedef typename record_type::key_type key_type;
01067 key_type operator () (const record_type & obj) const
01068 {
01069 return obj.key();
01070 }
01071 record_type max_value() const
01072 {
01073 return record_type::max_value();
01074 }
01075 record_type min_value() const
01076 {
01077 return record_type::min_value();
01078 }
01079 };
01080
01081
01087
01096 template <typename ExtIterator_>
01097 void ksort(ExtIterator_ first_, ExtIterator_ last_, unsigned_type M__)
01098 {
01099 ksort(first_, last_,
01100 ksort_defaultkey<typename ExtIterator_::vector_type::value_type>(), M__);
01101 }
01102
01103
01105
01106 __STXXL_END_NAMESPACE
01107
01108 #endif // !STXXL_KSORT_HEADER
01109