http://stxxl.sourceforge.net
<dementiev@mpi-sb.mpg.de>
<beckmann@cs.uni-frankfurt.de>
http://www.boost.org/LICENSE_1_0.txt
#ifndef STXXL_KSORT_HEADER
#define STXXL_KSORT_HEADER
#include <stxxl/bits/mng/mng.h>
#include <stxxl/bits/common/rand.h>
#include <stxxl/bits/mng/adaptor.h>
#include <stxxl/bits/common/simple_vector.h>
#include <stxxl/bits/common/switch.h>
#include <stxxl/bits/mng/block_alloc_interleaved.h>
#include <stxxl/bits/algo/intksort.h>
#include <stxxl/bits/algo/adaptor.h>
#include <stxxl/bits/algo/async_schedule.h>
#include <stxxl/bits/mng/block_prefetcher.h>
#include <stxxl/bits/mng/buf_writer.h>
#include <stxxl/bits/algo/run_cursor.h>
#include <stxxl/bits/algo/losertree.h>
#include <stxxl/bits/algo/inmemsort.h>
#include <stxxl/bits/algo/sort_base.h>
#include <stxxl/bits/common/is_sorted.h>
#include <stxxl/bits/common/utils.h>
#define OPT_MERGING
__STXXL_BEGIN_NAMESPACE
namespace ksort_local
{
template <typename _BIDTp, typename _KeyTp>
struct trigger_entry
{
typedef _BIDTp bid_type;
typedef _KeyTp key_type;
bid_type bid;
key_type key;
operator bid_type ()
{
return bid;
}
};
template <typename _BIDTp, typename _KeyTp>
inline bool operator < (const trigger_entry<_BIDTp, _KeyTp> & a,
const trigger_entry<_BIDTp, _KeyTp> & b)
{
return (a.key < b.key);
}
template <typename _BIDTp, typename _KeyTp>
inline bool operator > (const trigger_entry<_BIDTp, _KeyTp> & a,
const trigger_entry<_BIDTp, _KeyTp> & b)
{
return (a.key > b.key);
}
template <typename type, typename key_type1>
struct type_key
{
typedef key_type1 key_type;
key_type key;
type * ptr;
type_key() { }
type_key(key_type k, type * p) : key(k), ptr(p)
{ }
};
template <typename type, typename key1>
bool operator < (const type_key<type, key1> & a, const type_key<type, key1> & b)
{
return a.key < b.key;
}
template <typename type, typename key1>
bool operator > (const type_key<type, key1> & a, const type_key<type, key1> & b)
{
return a.key > b.key;
}
template <typename block_type, typename bid_type>
struct write_completion_handler
{
block_type * block;
bid_type bid;
request_ptr * req;
void operator () (request * )
{
* req = block->read(bid);
}
};
template <typename type_key_,
typename block_type,
typename run_type,
typename input_bid_iterator,
typename key_extractor>
inline void write_out(
type_key_ * begin,
type_key_ * end,
block_type * & cur_blk,
const block_type * end_blk,
int_type & out_block,
int_type & out_pos,
run_type & run,
write_completion_handler<block_type, typename block_type::bid_type> * & next_read,
typename block_type::bid_type * & bids,
request_ptr * write_reqs,
request_ptr * read_reqs,
input_bid_iterator & it,
key_extractor keyobj)
{
typedef typename block_type::bid_type bid_type;
typedef typename block_type::type type;
type * elem = cur_blk->elem;
for (type_key_ * p = begin; p < end; p++)
{
elem[out_pos++] = *(p->ptr);
if (out_pos >= block_type::size)
{
run[out_block].key = keyobj(*(cur_blk->elem));
if (cur_blk < end_blk)
{
next_read->block = cur_blk;
next_read->req = read_reqs + out_block;
read_reqs[out_block] = NULL;
bids[out_block] = next_read->bid = *(it++);
write_reqs[out_block] = cur_blk->write(
run[out_block].bid,
*(next_read++));
}
else
{
write_reqs[out_block] = cur_blk->write(run[out_block].bid);
}
cur_blk++;
elem = cur_blk->elem;
out_block++;
out_pos = 0;
}
}
}
template <
typename block_type,
typename run_type,
typename input_bid_iterator,
typename key_extractor>
void
create_runs(
input_bid_iterator it,
run_type ** runs,
const unsigned_type nruns,
const unsigned_type m2,
key_extractor keyobj)
{
typedef typename block_type::value_type type;
typedef typename block_type::bid_type bid_type;
typedef typename key_extractor::key_type key_type;
typedef type_key<type, key_type> type_key_;
block_manager * bm = block_manager::get_instance();
block_type * Blocks1 = new block_type[m2];
block_type * Blocks2 = new block_type[m2];
bid_type * bids = new bid_type[m2];
type_key_ * refs1 = new type_key_[m2 * Blocks1->size];
type_key_ * refs2 = new type_key_[m2 * Blocks1->size];
request_ptr * read_reqs = new request_ptr[m2];
request_ptr * write_reqs = new request_ptr[m2];
write_completion_handler<block_type, bid_type> * next_run_reads =
new write_completion_handler<block_type, bid_type>[m2];
run_type * run;
run = *runs;
int_type run_size = (*runs)->size();
key_type offset = 0;
const int log_k1 = log2_ceil((m2 * block_type::size * sizeof(type_key_) / STXXL_L2_SIZE) ?
(m2 * block_type::size * sizeof(type_key_) / STXXL_L2_SIZE) : 2);
const int log_k2 = log2_floor(m2 * Blocks1->size) - log_k1 - 1;
STXXL_VERBOSE("log_k1: " << log_k1 << " log_k2:" << log_k2);
const int_type k1 = 1 << log_k1;
const int_type k2 = 1 << log_k2;
int_type * bucket1 = new int_type[k1];
int_type * bucket2 = new int_type[k2];
int_type i;
disk_queues::get_instance()->set_priority_op(request_queue::WRITE);
for (i = 0; i < run_size; i++)
{
bids[i] = *(it++);
read_reqs[i] = Blocks1[i].read(bids[i]);
}
unsigned_type k = 0;
const int shift1 = sizeof(key_type) * 8 - log_k1;
const int shift2 = shift1 - log_k2;
STXXL_VERBOSE("shift1: " << shift1 << " shift2:" << shift2);
for ( ; k < nruns; k++)
{
run = runs[k];
run_size = run->size();
std::fill(bucket1, bucket1 + k1, 0);
type_key_ * ref_ptr = refs1;
for (i = 0; i < run_size; i++)
{
if (k)
write_reqs[i]->wait();
read_reqs[i]->wait();
bm->delete_block(bids[i]);
classify_block(Blocks1[i].begin(), Blocks1[i].end(), ref_ptr, bucket1, offset, shift1, keyobj);
}
exclusive_prefix_sum(bucket1, k1);
classify(refs1, refs1 + run_size * Blocks1->size, refs2, bucket1,
offset, shift1);
int_type out_block = 0;
int_type out_pos = 0;
unsigned_type next_run_size = (k < nruns - 1) ? (runs[k + 1]->size()) : 0;
type_key_ * c = refs2;
type_key_ * d = refs1;
block_type * cur_blk = Blocks2;
block_type * end_blk = Blocks2 + next_run_size;
write_completion_handler<block_type, bid_type> * next_read = next_run_reads;
for (i = 0; i < k1; i++)
{
type_key_ * cEnd = refs2 + bucket1[i];
type_key_ * dEnd = refs1 + bucket1[i];
l1sort(c, cEnd, d, bucket2, k2,
offset + (key_type(1) << key_type(shift1)) * key_type(i), shift2);
write_out(
d, dEnd, cur_blk, end_blk,
out_block, out_pos, *run, next_read, bids,
write_reqs, read_reqs, it, keyobj);
c = cEnd;
d = dEnd;
}
std::swap(Blocks1, Blocks2);
}
wait_all(write_reqs, m2);
delete[] bucket1;
delete[] bucket2;
delete[] refs1;
delete[] refs2;
delete[] Blocks1;
delete[] Blocks2;
delete[] bids;
delete[] next_run_reads;
delete[] read_reqs;
delete[] write_reqs;
}
template <typename block_type,
typename prefetcher_type,
typename key_extractor>
struct run_cursor2_cmp : public std::binary_function<run_cursor2<block_type, prefetcher_type>, run_cursor2<block_type, prefetcher_type>, bool>
{
typedef run_cursor2<block_type, prefetcher_type> cursor_type;
key_extractor keyobj;
run_cursor2_cmp(key_extractor keyobj_)
{
keyobj = keyobj_;
}
inline bool operator () (const cursor_type & a, const cursor_type & b) const
{
if (UNLIKELY(b.empty()))
return true;
if (UNLIKELY(a.empty()))
return false;
return (keyobj(a.current()) < keyobj(b.current()));
}
private:
run_cursor2_cmp() { }
};
template <typename record_type, typename key_extractor>
class key_comparison : public std::binary_function<record_type, record_type, bool>
{
key_extractor ke;
public:
key_comparison() { }
key_comparison(key_extractor ke_) : ke(ke_) { }
bool operator () (const record_type & a, const record_type & b) const
{
return ke(a) < ke(b);
}
};
template <typename block_type, typename run_type, typename key_ext_>
bool check_ksorted_runs(run_type ** runs,
unsigned_type nruns,
unsigned_type m,
key_ext_ keyext)
{
typedef typename block_type::value_type value_type;
STXXL_MSG("check_ksorted_runs Runs: " << nruns);
unsigned_type irun = 0;
for (irun = 0; irun < nruns; ++irun)
{
const unsigned_type nblocks_per_run = runs[irun]->size();
unsigned_type blocks_left = nblocks_per_run;
block_type * blocks = new block_type[m];
request_ptr * reqs = new request_ptr[m];
value_type last = keyext.min_value();
for (unsigned_type off = 0; off < nblocks_per_run; off += m)
{
const unsigned_type nblocks = STXXL_MIN(blocks_left, m);
const unsigned_type nelements = nblocks * block_type::size;
blocks_left -= nblocks;
for (unsigned_type j = 0; j < nblocks; ++j)
{
reqs[j] = blocks[j].read((*runs[irun])[off + j].bid);
}
wait_all(reqs, reqs + nblocks);
if (off && (keyext(blocks[0][0]) < keyext(last)))
{
STXXL_MSG("check_sorted_runs wrong first value in the run " << irun);
STXXL_MSG(" first value: " << blocks[0][0] << " with key" << keyext(blocks[0][0]));
STXXL_MSG(" last value: " << last << " with key" << keyext(last));
for (unsigned_type k = 0; k < block_type::size; ++k)
STXXL_MSG("Element " << k << " in the block is :" << blocks[0][k] << " key: " << keyext(blocks[0][k]));
return false;
}
for (unsigned_type j = 0; j < nblocks; ++j)
{
if (keyext(blocks[j][0]) != (*runs[irun])[off + j].key)
{
STXXL_MSG("check_sorted_runs wrong trigger in the run " << irun << " block " << (off + j));
STXXL_MSG(" trigger value: " << (*runs[irun])[off + j].key);
STXXL_MSG("Data in the block:");
for (unsigned_type k = 0; k < block_type::size; ++k)
STXXL_MSG("Element " << k << " in the block is :" << blocks[j][k] << " with key: " << keyext(blocks[j][k]));
STXXL_MSG("BIDS:");
for (unsigned_type k = 0; k < nblocks; ++k)
{
if (k == j)
STXXL_MSG("Bad one comes next.");
STXXL_MSG("BID " << (off + k) << " is: " << ((*runs[irun])[off + k].bid));
}
return false;
}
}
if (!stxxl::is_sorted(make_element_iterator(blocks, 0),
make_element_iterator(blocks, nelements),
key_comparison<value_type, key_ext_>()))
{
STXXL_MSG("check_sorted_runs wrong order in the run " << irun);
STXXL_MSG("Data in blocks:");
for (unsigned_type j = 0; j < nblocks; ++j)
{
for (unsigned_type k = 0; k < block_type::size; ++k)
STXXL_MSG(" Element " << k << " in block " << (off + j) << " is :" << blocks[j][k] << " with key: " << keyext(blocks[j][k]));
}
STXXL_MSG("BIDS:");
for (unsigned_type k = 0; k < nblocks; ++k)
{
STXXL_MSG("BID " << (k + off) << " is: " << ((*runs[irun])[k + off].bid));
}
return false;
}
last = blocks[nblocks - 1][block_type::size - 1];
}
assert(blocks_left == 0);
delete[] reqs;
delete[] blocks;
}
return true;
}
template <typename block_type, typename run_type, typename key_extractor>
void merge_runs(run_type ** in_runs, unsigned_type nruns, run_type * out_run, unsigned_type _m, key_extractor keyobj)
{
typedef block_prefetcher<block_type, typename run_type::iterator> prefetcher_type;
typedef run_cursor2<block_type, prefetcher_type> run_cursor_type;
unsigned_type i;
run_type consume_seq(out_run->size());
int_type * prefetch_seq = new int_type[out_run->size()];
typename run_type::iterator copy_start = consume_seq.begin();
for (i = 0; i < nruns; i++)
{
copy_start = std::copy(
in_runs[i]->begin(),
in_runs[i]->end(),
copy_start);
}
std::stable_sort(consume_seq.begin(), consume_seq.end() _STXXL_SORT_TRIGGER_FORCE_SEQUENTIAL);
unsigned disks_number = config::get_instance()->disks_number();
#ifdef PLAY_WITH_OPT_PREF
const int_type n_write_buffers = 4 * disks_number;
#else
const int_type n_prefetch_buffers = STXXL_MAX(int_type(2 * disks_number), (3 * (int_type(_m) - int_type(nruns)) / 4));
STXXL_VERBOSE("Prefetch buffers " << n_prefetch_buffers);
const int_type n_write_buffers = STXXL_MAX(int_type(2 * disks_number), int_type(_m) - int_type(nruns) - int_type(n_prefetch_buffers));
STXXL_VERBOSE("Write buffers " << n_write_buffers);
const int_type n_opt_prefetch_buffers = 2 * int_type(disks_number) + (3 * (int_type(n_prefetch_buffers) - int_type(2 * disks_number))) / 10;
STXXL_VERBOSE("Prefetch buffers " << n_opt_prefetch_buffers);
#endif
#if STXXL_SORT_OPTIMAL_PREFETCHING
compute_prefetch_schedule(
consume_seq,
prefetch_seq,
n_opt_prefetch_buffers,
disks_number);
#else
for (i = 0; i < out_run->size(); i++)
prefetch_seq[i] = i;
#endif
prefetcher_type prefetcher(consume_seq.begin(),
consume_seq.end(),
prefetch_seq,
nruns + n_prefetch_buffers);
buffered_writer<block_type> writer(n_write_buffers, n_write_buffers / 2);
unsigned_type out_run_size = out_run->size();
run_cursor2_cmp<block_type, prefetcher_type, key_extractor> cmp(keyobj);
loser_tree<
run_cursor_type,
run_cursor2_cmp<block_type, prefetcher_type, key_extractor> >
losers(&prefetcher, nruns, cmp);
block_type * out_buffer = writer.get_free_block();
for (i = 0; i < out_run_size; i++)
{
losers.multi_merge(out_buffer->elem, out_buffer->elem + block_type::size);
(*out_run)[i].key = keyobj(out_buffer->elem[0]);
out_buffer = writer.write(out_buffer, (*out_run)[i].bid);
}
delete[] prefetch_seq;
block_manager * bm = block_manager::get_instance();
for (i = 0; i < nruns; i++)
{
unsigned_type sz = in_runs[i]->size();
for (unsigned_type j = 0; j < sz; j++)
bm->delete_block((*in_runs[i])[j].bid);
delete in_runs[i];
}
}
template <typename block_type,
typename alloc_strategy,
typename input_bid_iterator,
typename key_extractor>
simple_vector<trigger_entry<typename block_type::bid_type, typename key_extractor::key_type> > *
ksort_blocks(input_bid_iterator input_bids, unsigned_type _n, unsigned_type _m, key_extractor keyobj)
{
typedef typename block_type::value_type type;
typedef typename key_extractor::key_type key_type;
typedef typename block_type::bid_type bid_type;
typedef trigger_entry<bid_type, typename key_extractor::key_type> trigger_entry_type;
typedef simple_vector<trigger_entry_type> run_type;
typedef typename interleaved_alloc_traits<alloc_strategy>::strategy interleaved_alloc_strategy;
unsigned_type m2 = div_ceil(_m, 2);
const unsigned_type m2_rf = m2 * block_type::raw_size /
(block_type::raw_size + block_type::size * sizeof(type_key<type, key_type>));
STXXL_VERBOSE("Reducing number of blocks in a run from " << m2 << " to " <<
m2_rf << " due to key size: " << sizeof(typename key_extractor::key_type) << " bytes");
m2 = m2_rf;
unsigned_type full_runs = _n / m2;
unsigned_type partial_runs = ((_n % m2) ? 1 : 0);
unsigned_type nruns = full_runs + partial_runs;
unsigned_type i;
block_manager * mng = block_manager::get_instance();
STXXL_VERBOSE("n=" << _n << " nruns=" << nruns << "=" << full_runs << "+" << partial_runs);
double begin = timestamp(), after_runs_creation, end;
run_type ** runs = new run_type *[nruns];
for (i = 0; i < full_runs; i++)
runs[i] = new run_type(m2);
#ifdef INTERLEAVED_ALLOC
if (partial_runs)
{
unsigned_type last_run_size = _n - full_runs * m2;
runs[i] = new run_type(last_run_size);
mng->new_blocks(interleaved_alloc_strategy(nruns, alloc_strategy()),
RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>
(runs, 0, nruns, last_run_size),
RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>
(runs, _n, nruns, last_run_size));
}
else
mng->new_blocks(interleaved_alloc_strategy(nruns, alloc_strategy()),
RunsToBIDArrayAdaptor<block_type::raw_size, run_type>
(runs, 0, nruns),
RunsToBIDArrayAdaptor<block_type::raw_size, run_type>
(runs, _n, nruns));
#else
if (partial_runs)
runs[i] = new run_type(_n - full_runs * m2);
for (i = 0; i < nruns; i++)
{
mng->new_blocks(alloc_strategy(), make_bid_iterator(runs[i]->begin()), make_bid_iterator(runs[i]->end()));
}
#endif
create_runs<block_type,
run_type,
input_bid_iterator,
key_extractor>(input_bids, runs, nruns, m2, keyobj);
after_runs_creation = timestamp();
double io_wait_after_rf = stats::get_instance()->get_io_wait_time();
disk_queues::get_instance()->set_priority_op(request_queue::WRITE);
const int_type merge_factor = optimal_merge_factor(nruns, _m);
run_type ** new_runs;
while (nruns > 1)
{
int_type new_nruns = div_ceil(nruns, merge_factor);
STXXL_VERBOSE("Starting new merge phase: nruns: " << nruns <<
" opt_merge_factor: " << merge_factor << " m:" << _m << " new_nruns: " << new_nruns);
new_runs = new run_type *[new_nruns];
int_type runs_left = nruns;
int_type cur_out_run = 0;
int_type blocks_in_new_run = 0;
while (runs_left > 0)
{
int_type runs2merge = STXXL_MIN(runs_left, merge_factor);
blocks_in_new_run = 0;
for (unsigned_type i = nruns - runs_left; i < (nruns - runs_left + runs2merge); i++)
blocks_in_new_run += runs[i]->size();
new_runs[cur_out_run++] = new run_type(blocks_in_new_run);
runs_left -= runs2merge;
}
if (cur_out_run == 1 && blocks_in_new_run == int_type(_n) && !input_bids->is_managed())
{
input_bid_iterator cur = input_bids;
for (int_type i = 0; cur != (input_bids + _n); ++cur)
{
(*new_runs[0])[i++].bid = *cur;
}
bid_type & firstBID = (*new_runs[0])[0].bid;
if (firstBID.is_managed())
{
mng->new_block(FR(), firstBID);
}
bid_type & lastBID = (*new_runs[0])[_n - 1].bid;
if (lastBID.is_managed())
{
mng->new_block(FR(), lastBID);
}
}
else
{
mng->new_blocks(interleaved_alloc_strategy(new_nruns, alloc_strategy()),
RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>(new_runs, 0, new_nruns, blocks_in_new_run),
RunsToBIDArrayAdaptor2<block_type::raw_size, run_type>(new_runs, _n, new_nruns, blocks_in_new_run));
}
runs_left = nruns;
cur_out_run = 0;
while (runs_left > 0)
{
int_type runs2merge = STXXL_MIN(runs_left, merge_factor);
#if STXXL_CHECK_ORDER_IN_SORTS
assert((check_ksorted_runs<block_type, run_type, key_extractor>(runs + nruns - runs_left, runs2merge, m2, keyobj)));
#endif
STXXL_VERBOSE("Merging " << runs2merge << " runs");
merge_runs<block_type, run_type, key_extractor>(runs + nruns - runs_left,
runs2merge, *(new_runs + (cur_out_run++)), _m, keyobj);
runs_left -= runs2merge;
}
nruns = new_nruns;
delete[] runs;
runs = new_runs;
}
run_type * result = *runs;
delete[] runs;
end = timestamp();
STXXL_VERBOSE("Elapsed time : " << end - begin << " s. Run creation time: " <<
after_runs_creation - begin << " s");
STXXL_VERBOSE("Time in I/O wait(rf): " << io_wait_after_rf << " s");
STXXL_VERBOSE(*stats::get_instance());
STXXL_UNUSED(begin + after_runs_creation + end + io_wait_after_rf);
return result;
}
}
template <typename ExtIterator_, typename KeyExtractor_>
void ksort(ExtIterator_ first_, ExtIterator_ last_, KeyExtractor_ keyobj, unsigned_type M__)
{
typedef simple_vector<ksort_local::trigger_entry<typename ExtIterator_::bid_type,
typename KeyExtractor_::key_type> > run_type;
typedef typename ExtIterator_::vector_type::value_type value_type;
typedef typename ExtIterator_::block_type block_type;
unsigned_type n = 0;
block_manager * mng = block_manager::get_instance();
first_.flush();
if ((last_ - first_) * sizeof(value_type) < M__)
{
stl_in_memory_sort(first_, last_, ksort_local::key_comparison<value_type, KeyExtractor_>(keyobj));
}
else
{
assert(2 * block_type::raw_size <= M__);
if (first_.block_offset())
{
if (last_.block_offset())
{
typename ExtIterator_::block_type * first_block = new typename ExtIterator_::block_type;
typename ExtIterator_::block_type * last_block = new typename ExtIterator_::block_type;
typename ExtIterator_::bid_type first_bid, last_bid;
request_ptr req;
req = first_block->read(*first_.bid());
mng->new_block(FR(), first_bid);
mng->new_block(FR(), last_bid);
req->wait();
req = last_block->read(*last_.bid());
unsigned_type i = 0;
for ( ; i < first_.block_offset(); i++)
{
first_block->elem[i] = keyobj.min_value();
}
req->wait();
req = first_block->write(first_bid);
for (i = last_.block_offset(); i < block_type::size; i++)
{
last_block->elem[i] = keyobj.max_value();
}
req->wait();
req = last_block->write(last_bid);
n = last_.bid() - first_.bid() + 1;
std::swap(first_bid, *first_.bid());
std::swap(last_bid, *last_.bid());
req->wait();
delete first_block;
delete last_block;
run_type * out =
ksort_local::ksort_blocks<
typename ExtIterator_::block_type,
typename ExtIterator_::vector_type::alloc_strategy_type,
typename ExtIterator_::bids_container_iterator,
KeyExtractor_>
(first_.bid(), n, M__ / block_type::raw_size, keyobj);
first_block = new typename ExtIterator_::block_type;
last_block = new typename ExtIterator_::block_type;
typename ExtIterator_::block_type * sorted_first_block = new typename ExtIterator_::block_type;
typename ExtIterator_::block_type * sorted_last_block = new typename ExtIterator_::block_type;
request_ptr * reqs = new request_ptr[2];
reqs[0] = first_block->read(first_bid);
reqs[1] = sorted_first_block->read((*(out->begin())).bid);
wait_all(reqs, 2);
reqs[0] = last_block->read(last_bid);
reqs[1] = sorted_last_block->read(((*out)[out->size() - 1]).bid);
for (i = first_.block_offset(); i < block_type::size; i++)
{
first_block->elem[i] = sorted_first_block->elem[i];
}
wait_all(reqs, 2);
req = first_block->write(first_bid);
for (i = 0; i < last_.block_offset(); i++)
{
last_block->elem[i] = sorted_last_block->elem[i];
}
req->wait();
req = last_block->write(last_bid);
mng->delete_block(out->begin()->bid);
mng->delete_block((*out)[out->size() - 1].bid);
*first_.bid() = first_bid;
*last_.bid() = last_bid;
typename run_type::iterator it = out->begin();
it++;
typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
cur_bid++;
for ( ; cur_bid != last_.bid(); cur_bid++, it++)
{
*cur_bid = (*it).bid;
}
delete first_block;
delete sorted_first_block;
delete sorted_last_block;
delete[] reqs;
delete out;
req->wait();
delete last_block;
}
else
{
typename ExtIterator_::block_type * first_block = new typename ExtIterator_::block_type;
typename ExtIterator_::bid_type first_bid;
request_ptr req;
req = first_block->read(*first_.bid());
mng->new_block(FR(), first_bid);
req->wait();
unsigned_type i = 0;
for ( ; i < first_.block_offset(); i++)
{
first_block->elem[i] = keyobj.min_value();
}
req = first_block->write(first_bid);
n = last_.bid() - first_.bid();
std::swap(first_bid, *first_.bid());
req->wait();
delete first_block;
run_type * out =
ksort_local::ksort_blocks<
typename ExtIterator_::block_type,
typename ExtIterator_::vector_type::alloc_strategy_type,
typename ExtIterator_::bids_container_iterator,
KeyExtractor_>
(first_.bid(), n, M__ / block_type::raw_size, keyobj);
first_block = new typename ExtIterator_::block_type;
typename ExtIterator_::block_type * sorted_first_block = new typename ExtIterator_::block_type;
request_ptr * reqs = new request_ptr[2];
reqs[0] = first_block->read(first_bid);
reqs[1] = sorted_first_block->read((*(out->begin())).bid);
wait_all(reqs, 2);
for (i = first_.block_offset(); i < block_type::size; i++)
{
first_block->elem[i] = sorted_first_block->elem[i];
}
req = first_block->write(first_bid);
mng->delete_block(out->begin()->bid);
*first_.bid() = first_bid;
typename run_type::iterator it = out->begin();
it++;
typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
cur_bid++;
for ( ; cur_bid != last_.bid(); cur_bid++, it++)
{
*cur_bid = (*it).bid;
}
*cur_bid = (*it).bid;
delete sorted_first_block;
delete[] reqs;
delete out;
req->wait();
delete first_block;
}
}
else
{
if (last_.block_offset())
{
typename ExtIterator_::block_type * last_block = new typename ExtIterator_::block_type;
typename ExtIterator_::bid_type last_bid;
request_ptr req;
unsigned_type i;
req = last_block->read(*last_.bid());
mng->new_block(FR(), last_bid);
req->wait();
for (i = last_.block_offset(); i < block_type::size; i++)
{
last_block->elem[i] = keyobj.max_value();
}
req = last_block->write(last_bid);
n = last_.bid() - first_.bid() + 1;
std::swap(last_bid, *last_.bid());
req->wait();
delete last_block;
run_type * out =
ksort_local::ksort_blocks<
typename ExtIterator_::block_type,
typename ExtIterator_::vector_type::alloc_strategy_type,
typename ExtIterator_::bids_container_iterator,
KeyExtractor_>
(first_.bid(), n, M__ / block_type::raw_size, keyobj);
last_block = new typename ExtIterator_::block_type;
typename ExtIterator_::block_type * sorted_last_block = new typename ExtIterator_::block_type;
request_ptr * reqs = new request_ptr[2];
reqs[0] = last_block->read(last_bid);
reqs[1] = sorted_last_block->read(((*out)[out->size() - 1]).bid);
wait_all(reqs, 2);
for (i = 0; i < last_.block_offset(); i++)
{
last_block->elem[i] = sorted_last_block->elem[i];
}
req = last_block->write(last_bid);
mng->delete_block((*out)[out->size() - 1].bid);
*last_.bid() = last_bid;
typename run_type::iterator it = out->begin();
typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
for ( ; cur_bid != last_.bid(); cur_bid++, it++)
{
*cur_bid = (*it).bid;
}
delete sorted_last_block;
delete[] reqs;
delete out;
req->wait();
delete last_block;
}
else
{
n = last_.bid() - first_.bid();
run_type * out =
ksort_local::ksort_blocks<
typename ExtIterator_::block_type,
typename ExtIterator_::vector_type::alloc_strategy_type,
typename ExtIterator_::bids_container_iterator,
KeyExtractor_>
(first_.bid(), n, M__ / block_type::raw_size, keyobj);
typename run_type::iterator it = out->begin();
typename ExtIterator_::bids_container_iterator cur_bid = first_.bid();
for ( ; cur_bid != last_.bid(); cur_bid++, it++)
{
*cur_bid = (*it).bid;
}
delete out;
}
}
}
#if STXXL_CHECK_ORDER_IN_SORTS
typedef typename ExtIterator_::const_iterator const_iterator;
assert(stxxl::is_sorted(const_iterator(first_), const_iterator(last_),
ksort_local::key_comparison<value_type, KeyExtractor_>()));
#endif
}
template <typename record_type>
struct ksort_defaultkey
{
typedef typename record_type::key_type key_type;
key_type operator () (const record_type & obj) const
{
return obj.key();
}
record_type max_value() const
{
return record_type::max_value();
}
record_type min_value() const
{
return record_type::min_value();
}
};
http://www.sgi.com/tech/stl/StrictWeakOrdering.html
template <typename ExtIterator_>
void ksort(ExtIterator_ first_, ExtIterator_ last_, unsigned_type M__)
{
ksort(first_, last_,
ksort_defaultkey<typename ExtIterator_::vector_type::value_type>(), M__);
}
__STXXL_END_NAMESPACE
#endif