/
priority_queue.inl
1018 lines (879 loc) · 31.8 KB
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priority_queue.inl
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// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; c-file-style: "stroustrup"; -*-
// vi:set ts=4 sts=4 sw=4 noet cino+=(0 :
// Copyright 2008, 2011, 2012, The TPIE development team
//
// This file is part of TPIE.
//
// TPIE is free software: you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// TPIE is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with TPIE. If not, see <http://www.gnu.org/licenses/>
template<typename T, typename Comparator, typename OPQType>
priority_queue<T, Comparator, OPQType>::priority_queue(double f, float b) :
block_factor(b) { // constructor mem fraction
assert(f<= 1.0 && f > 0);
assert(b > 0.0);
memory_size_type mm_avail = consecutive_memory_available();
TP_LOG_DEBUG("priority_queue: Memory limit: "
<< mm_avail/1024/1024 << "mb("
<< mm_avail << "bytes)" << "\n");
mm_avail = static_cast<memory_size_type>(static_cast<double>(mm_avail)*f);
init(mm_avail);
}
#ifndef DOXYGEN
template<typename T, typename Comparator, typename OPQType>
priority_queue<T, Comparator, OPQType>::priority_queue(memory_size_type mm_avail, float b) :
block_factor(b) { // constructor absolute mem
assert(mm_avail <= get_memory_manager().limit() && mm_avail > 0);
assert(b > 0.0);
TP_LOG_DEBUG("priority_queue: Memory limit: "
<< mm_avail/1024/1024 << "mb("
<< mm_avail << "bytes)" << "\n");
init(mm_avail);
}
#endif
template<typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::init(memory_size_type mm_avail) { // init
#ifdef _WIN32
#ifndef _WIN64
mm_avail = std::min(mm_avail, static_cast<memory_size_type>(1024*1024*512));
#endif //_WIN64
#endif //_WIN32
TP_LOG_DEBUG("m_for_queue: "
<< mm_avail << "\n");
TP_LOG_DEBUG("memory before alloc: "
<< get_memory_manager().available() << "b" << "\n");
{
//Calculate M
setting_m = mm_avail/sizeof(T);
//Get stream memory usage
memory_size_type usage = file_stream<T>::memory_usage(block_factor);
TP_LOG_DEBUG("Memory used by file_stream: " << usage << "b\n");
memory_size_type alloc_overhead = 0;
//Compute overhead of the parameters
const memory_size_type fanout_overhead = 2*sizeof(stream_size_type)// group state
+ (usage+sizeof(file_stream<T>*)+alloc_overhead) //temporary streams
+ (sizeof(T)+sizeof(group_type)); //mergeheap
const memory_size_type sq_fanout_overhead = 3*sizeof(stream_size_type); //slot_state
const memory_size_type heap_m_overhead = sizeof(T) //opg
+ sizeof(T) //gbuffer0
+ sizeof(T) //extra buffer for remove_group_buffer
+ 2*sizeof(T); //mergebuffer
const memory_size_type buffer_m_overhead = sizeof(T) + 2*sizeof(T); //buffer
const memory_size_type extra_overhead =
2*(usage+sizeof(file_stream<T>*)+alloc_overhead) //temporary streams
+ 2*(sizeof(T)+sizeof(group_type)); //mergeheap
const memory_size_type additional_overhead = 16*1024; //Just leave a bit unused
TP_LOG_DEBUG("fanout_overhead " << fanout_overhead << ",\n" <<
"sq_fanout_overhead " << sq_fanout_overhead << ",\n" <<
"heap_m_overhead " << heap_m_overhead << ",\n" <<
"buffer_m_overhead " << buffer_m_overhead << ",\n" <<
"extra_overhead " << extra_overhead << ",\n" <<
"additional_overhead " << additional_overhead << ".\n\n");
//Check that there is enough space for the simple overhead
if(mm_avail < extra_overhead+additional_overhead){
throw priority_queue_error("Not enough memory available for priority queue");
}
//Setup the fanout, heap_m and buffer_m
mm_avail-=additional_overhead+extra_overhead; //Subtract the extra space used
setting_mmark = (mm_avail/16)/buffer_m_overhead; //Set the buffer size
TP_LOG_DEBUG("mm_avail " << mm_avail << ",\n" <<
"setting_mmark " << setting_mmark << ".\n\n");
mm_avail-=setting_mmark*buffer_m_overhead;
setting_k = (mm_avail/2);
TP_LOG_DEBUG("mm_avail " << mm_avail << ",\n" <<
"setting_k " << setting_k << ".\n\n");
{
//compute setting_k
//some of these numbers get big which is the reason for all this
//careful casting.
stream_size_type squared_tmp =
static_cast<stream_size_type>(fanout_overhead)
*static_cast<stream_size_type>(fanout_overhead);
squared_tmp +=
static_cast<stream_size_type>(4*sq_fanout_overhead)
*static_cast<stream_size_type>(setting_k);
long double dsquared_tmp = static_cast<long double>(squared_tmp);
const stream_size_type root_discriminant =
static_cast<stream_size_type>(std::floor(std::sqrt(dsquared_tmp)));
const stream_size_type nominator = root_discriminant-fanout_overhead;
const stream_size_type denominator = 2*sq_fanout_overhead;
setting_k = static_cast<memory_size_type>(nominator/denominator); //Set fanout
// Don't open too many files
setting_k = std::min(available_files()-40, setting_k);
// Performance degrades with more than around 250 open files
setting_k = std::min(static_cast<memory_size_type>(250), setting_k);
}
mm_avail-=setting_k*heap_m_overhead+setting_k*setting_k*sq_fanout_overhead;
setting_m = (mm_avail)/heap_m_overhead;
TP_LOG_DEBUG("mm_avail " << mm_avail << ",\n" <<
"setting_m " << setting_m << ",\n" <<
"setting_k " << setting_k << ".\n\n");
//Check that minimum requirements on fanout and buffersizes are met
const memory_size_type min_fanout=3;
const memory_size_type min_heap_m=4;
const memory_size_type min_buffer_m=2;
if(setting_k<min_fanout || setting_m<min_heap_m || setting_mmark<min_buffer_m){
TP_LOG_FATAL_ID("Priority queue: Not enough memory. Increase allowed memory.");
throw exception("Priority queue: Not enough memory. Increase allowed memory.");
}
// this is assumed in empty_group.
assert(2*setting_m > sizeof(file_stream<T>) + setting_k*(sizeof(T) + sizeof(size_type)
+ sizeof(file_stream<T>)));
}
current_r = 0;
m_size = 0; // total size of priority queue
buffer_size = 0;
buffer_start = 0;
TP_LOG_DEBUG("priority_queue" << "\n"
<< "\tsetting_k: " << setting_k << "\n"
<< "\tsetting_mmark: " << setting_mmark << "\n"
<< "\tsetting_m: " << setting_m << "\n");
assert(setting_k > 0);
assert(current_r == 0);
assert(setting_m > 0);
assert(setting_mmark > 0);
assert(setting_m > setting_mmark);
if(setting_m < setting_mmark) {
TP_LOG_FATAL_ID("wrong settings");
throw exception("Priority queue: m < m'");
}
opq.reset(tpie_new<OPQType>(setting_m));
assert(OPQType::sorted_factor == 1);
// state arrays contain: start + size
slot_state.resize(setting_k*setting_k*3);
group_state.resize(setting_k*2);
buffer.resize(setting_mmark);
gbuffer0.resize(setting_m);
mergebuffer.resize(setting_m*2);
// clear memory
for(memory_size_type i = 0; i<setting_k*setting_k; i++) {
slot_state[i*3] = 0;
slot_state[i*3+1] = 0;
slot_state[i*3+2] = i;
}
slot_data_id = setting_k*setting_k+1;
for(memory_size_type i = 0; i< setting_k*2; i++) {
group_state[i] = 0;
}
std::stringstream ss;
ss << tempname::tpie_name("pq_data");
datafiles.resize(setting_k*setting_k);
groupdatafiles.resize(setting_k);
TP_LOG_DEBUG("memory after alloc: "
<< get_memory_manager().available() << "b" << "\n");
}
template <typename T, typename Comparator, typename OPQType>
priority_queue<T, Comparator, OPQType>::~priority_queue() { // destructor
datafiles.resize(0); // unlink slots
groupdatafiles.resize(0); // unlink groups
buffer.resize(0);
gbuffer0.resize(0);
mergebuffer.resize(0);
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::push(const T& x) {
if(opq->full()) {
// When the overflow priority queue (aka. insertion buffer) is full,
// insert its contents into a new slot in group 0.
//
// To maintain the heap invariant
// deletion buffer <= group buffer 0 <= group 0 slots
// we bubble lesser elements from insertion buffer down into
// deletion buffer and group buffer 0.
slot_type slot = free_slot(0); // (if group 0 is full, we recursively empty group i
// by merging it into a slot in group i+1)
assert(opq->sorted_size() == setting_m);
T* arr = opq->sorted_array();
// Bubble lesser elements down into deletion buffer
if(buffer_size > 0) {
// fetch insertion buffer
memcpy(&mergebuffer[0], &arr[0], sizeof(T)*opq->sorted_size());
// fetch deletion buffer
memcpy(&mergebuffer[opq->sorted_size()], &buffer[buffer_start], sizeof(T)*buffer_size);
// sort buffer elements
std::sort(mergebuffer.get(), mergebuffer.get()+(buffer_size+opq->sorted_size()), comp_);
// smaller elements go in deletion buffer
memcpy(buffer.get()+buffer_start, mergebuffer.get(), sizeof(T)*buffer_size);
// larger elements go in insertion buffer
memcpy(&arr[0], mergebuffer.get()+buffer_size, sizeof(T)*opq->sorted_size());
}
// Bubble lesser elements down into group buffer 0
if(group_size(0)> 0) {
// Merge insertion buffer and group buffer 0
assert(group_size(0)+opq->sorted_size() <= setting_m*2);
memory_size_type j = 0;
// fetch gbuffer0
for(stream_size_type i = group_start(0); i < group_start(0)+group_size(0); i++) {
mergebuffer[j] = gbuffer0[static_cast<memory_size_type>(i%setting_m)];
++j;
}
// fetch insertion buffer
memcpy(&mergebuffer[j], &arr[0], sizeof(T)*opq->sorted_size());
// sort
std::sort(mergebuffer.get(), mergebuffer.get()+(group_size(0)+opq->sorted_size()), comp_);
// smaller elements go in gbuffer0
memcpy(gbuffer0.get(), mergebuffer.get(), static_cast<size_t>(sizeof(T)*group_size(0)));
group_start_set(0,0);
// larger elements go in insertion buffer (actually a free group 0 slot)
memcpy(&arr[0], &mergebuffer[group_size(0)], sizeof(T)*opq->sorted_size());
}
// move insertion buffer (which has elements larger than all of
// gbuffer0 and deletion buffer) into a free group 0 slot
write_slot(slot, arr, opq->sorted_size());
opq->sorted_pop();
// insertion buffer is now empty
}
// insertion buffer is non-full. insert element.
opq->push(x);
m_size++;
#ifndef NDEBUG
validate();
#endif
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::pop() {
if(empty()) {
throw priority_queue_error("pop() invoked on empty priority queue");
}
// Call top() to freshen deletion buffer (if empty) and min_in_buffer
top();
// The top element is in either the insertion buffer or the deletion buffer.
if(min_in_buffer) {
// Top element in deletion buffer
buffer_size--;
buffer_start++;
if(buffer_size == 0) {
buffer_start = 0;
}
} else {
// Top element in insertion buffer
opq->pop();
}
m_size--;
#ifndef NDEBUG
validate();
#endif
}
template <typename T, typename Comparator, typename OPQType>
const T& priority_queue<T, Comparator, OPQType>::top() {
// If the deletion buffer is empty, refill it with elements from the group buffers
if(buffer_size == 0 && opq->size() != m_size) {
fill_buffer();
}
// The top element is in either the insertion buffer or the deletion buffer.
if(buffer_size == 0 && opq->size() == 0) {
throw priority_queue_error("top() invoked on empty priority queue");
} else if(opq->size() == 0) {
min=buffer[buffer_start];
min_in_buffer = true;
} else if(buffer_size == 0) {
min=opq->top();
min_in_buffer = false;
} else if(comp_(buffer[buffer_start], opq->top())) { // compare
min=buffer[buffer_start];
min_in_buffer = true;
} else {
min=opq->top();
min_in_buffer = false;
}
#ifndef NDEBUG
validate();
#endif
return min;
}
template <typename T, typename Comparator, typename OPQType>
stream_size_type priority_queue<T, Comparator, OPQType>::size() const {
return m_size;
}
template <typename T, typename Comparator, typename OPQType>
bool priority_queue<T, Comparator, OPQType>::empty() const {
return m_size == 0;
}
template <typename T, typename Comparator, typename OPQType> template <typename F>
F priority_queue<T, Comparator, OPQType>::pop_equals(F f) {
T a = top();
f(a);
pop();
if(size() == 0) return f;
T b = top();
while(!(comp_(a, b))) { // compare
f(b);
pop();
if(size() == 0) return f;
b = top();
}
return f;
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::dump() {
TP_LOG_DEBUG( "--------------------------------------------------------------" << "\n"
<< "DUMP:\tTotal size: "
<< m_size << ", OPQ size: "
<< opq->size()
<< ", OPQ top: ");
if(opq->size()>0) {
TP_LOG_DEBUG("" << opq->top());
} else {
TP_LOG_DEBUG("empty");
}
TP_LOG_DEBUG(", current_r: "
<< current_r << "\n"
<< "\tBuffer size: "
<< buffer_size
<< ", buffer start: "
<< buffer_start
<< "\n" << "\t");
// output main buffer
for(memory_size_type i = 0; i<setting_mmark; i++) {
TP_LOG_DEBUG((i<buffer_start || buffer_start+buffer_size <=i ?"(":"")
<< buffer[i]
<< (i<buffer_start || buffer_start+buffer_size <=i ?")":"")
<< " ");
}
TP_LOG_DEBUG("\n");
// output groups
for(memory_size_type i =0; i<current_r; i++) {
TP_LOG_DEBUG("GROUP " << i << " ------------------------------------------------------" << "\n");
TP_LOG_DEBUG("\tGroup Buffer, size: "
<< group_size(i) << ", start: "
<< group_start(i) << "\n" << "\t\tBuffer(no ('s): ");
if(i == 0) { // group buffer 0 is special
TP_LOG_DEBUG("internal: ");
memory_size_type k = 0;
for(k = 0; k < setting_m; k++) {
TP_LOG_DEBUG(gbuffer0[k] << " ");
}
TP_LOG_DEBUG("\n");
} else {
// output group buffer contents
file_stream<T> instream(block_factor);
instream.open(group_data(i));
memory_size_type k = 0;
if(group_size(i) > 0) {
for(k = 0; k < setting_m; k++) {
TP_LOG_DEBUG(instream.read() << " ");
}
}
for(memory_size_type l = k; l < setting_m; l++) {
TP_LOG_DEBUG("() ");
}
TP_LOG_DEBUG("\n");
}
// output slots
for(memory_size_type j = i*setting_k; j<i*setting_k+setting_k; j++) {
TP_LOG_DEBUG("\t\tSlot " << j << "(size: "
<< slot_size(j)
<< " start: " << slot_start(j) << "):");
file_stream<T> instream(block_factor);
instream.open(slot_data(j));
stream_size_type k;
for(k = 0; k < slot_start(j)+slot_size(j); k++) {
TP_LOG_DEBUG((k>=slot_start(j)?"":"(") <<
instream.read() <<
(k>=slot_start(j)?"":")") << " ");
}
for(stream_size_type l = k; l < slot_max_size(j); l++) {
TP_LOG_DEBUG("() ");
}
TP_LOG_DEBUG("\n");
}
}
TP_LOG_DEBUG("--------------------------------------------------------------\n");
}
/////////////////////////////
// Private
/////////////////////////////
// Find a free slot in given group.
// If the group is full, call empty_group,
// which calls remove_group_buffer, which calls free_slot(0)
template <typename T, typename Comparator, typename OPQType>
typename priority_queue<T, Comparator, OPQType>::slot_type
priority_queue<T, Comparator, OPQType>::free_slot(group_type group) {
slot_type i;
if(group>=setting_k) {
std::stringstream msg;
msg << "Error, queue is full no free slots in invalid group "
<< group << ". Increase k.";
TP_LOG_FATAL_ID(msg.str());
throw exception(msg.str());
}
for(i = group*setting_k; i < group*setting_k+setting_k; i++) {
if(slot_size(i) == 0) {
// This slot is good
break;
}
}
if(i == group*setting_k+setting_k) {
// All slots are occupied. Empty this group by merging slots into a
// single free slot in group+1.
empty_group(group);
if(slot_size(group*setting_k) != 0) {
return free_slot(group); // some group buffers might have been moved
}
return group*setting_k;
}
return i;
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::fill_buffer() {
if(buffer_size !=0) {
return;
}
if(current_r == 0) { // todo: check that this is ok
return;
}
// refill group buffers, if needed
for(memory_size_type i=0;i<current_r;i++) {
if(group_size(i)<static_cast<stream_size_type>(setting_mmark)) {
fill_group_buffer(i);
}
if(group_size(i) == 0 && i==current_r-1) {
current_r--;
}
}
// merge to buffer
mergebuffer.resize(0);
#ifndef TPIE_NDEBUG
std::cout << "memavail after mb free: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
{
pq_merge_heap<T, Comparator> heap(current_r);
tpie::array<tpie::auto_ptr<file_stream<T> > > data(current_r);
for(memory_size_type i = 0; i<current_r; i++) {
data[i].reset(tpie_new<file_stream<T> >(block_factor));
if(i == 0 && group_size(i)>0) {
heap.push(gbuffer0[group_start(0)], 0);
} else if(group_size(i)>0) {
data[i]->open(group_data(i));
data[i]->seek(group_start(i));
heap.push(data[i]->read(), i);
} else if(i > 0) {
// dummy, well :o/
}
}
while(!heap.empty() && buffer_size!=setting_mmark) {
group_type current_group = heap.top_run();
if(current_group!= 0 && data[current_group]->offset() == setting_m) {
data[current_group]->seek(0);
}
buffer[(buffer_size+buffer_start)%setting_m] = heap.top();
buffer_size++;
assert(group_size(current_group)-1 >= 0);
group_size_set(current_group, group_size(current_group)-1);
group_start_set(current_group, (group_start(current_group)+1)%setting_m);
if(group_size(current_group) == 0) {
heap.pop();
} else {
if(current_group == 0) {
heap.pop_and_push(gbuffer0[group_start(0)], 0);
} else {
heap.pop_and_push(data[current_group]->read(), current_group);
}
}
}
} // destruct and deallocate `heap'
#ifndef TPIE_NDEBUG
std::cout << "memavail before mb alloc: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
mergebuffer.resize(setting_m*2);
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::fill_group_buffer(group_type group) {
assert(group_size(group) < static_cast<stream_size_type>(setting_mmark));
// max k + 1 open streams
// 1 merge heap
// opq still in action
//get rid of mergebuffer so that we enough memory
//for the heap and misc structures below
//this array is reallocated below
mergebuffer.resize(0);
#ifndef TPIE_NDEBUG
std::cout << "memavail after mb free: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
// merge
{
//group output stream, not used if group==0 in this case
//the in-memory gbuffer0 is used
file_stream<T> out(block_factor);
out.open(group_data(group));
if(group > 0) {
out.seek((group_start(group)+group_size(group))%setting_m);
}
//merge heap for the setting_k slots
pq_merge_heap<T, Comparator> heap(setting_k);
//Create streams for the non-empty slots and initialize
//internal heap with one element per slot
tpie::array<tpie::auto_ptr<file_stream<T> > > data(setting_k);
for(memory_size_type i = 0; i<setting_k; i++) {
data[i].reset(tpie_new<file_stream<T> >(block_factor));
if(slot_size(group*setting_k+i)>0) {
//slot is non-empry, opening stream
slot_type slotid = group*setting_k+i;
data[i]->open(slot_data(slotid));
//seek to start of slot
data[i]->seek(slot_start(slotid));
//push first item of slot on the stream
heap.push(data[i]->read(), slotid);
}
}
//perform actual reading until group if full or all
//the slots are empty
while(!heap.empty() && group_size(group)!=static_cast<stream_size_type>(setting_m)) {
slot_type current_slot = heap.top_run();
if(group == 0) {
//use in-memory array for group 0
gbuffer0[(group_start(0)+group_size(0))%setting_m] = heap.top();
} else {
//write to disk for group >0
if(out.offset() == setting_m) {
out.seek(0);
}
out.write(heap.top());
}
//increase group size
group_size_set(group, group_size(group) + 1);
//decrease slot size and increase starting index
slot_start_set(current_slot, slot_start(current_slot)+1);
slot_size_set(current_slot, slot_size(current_slot)-1);
//pop from heap and insert next element (if any) from the slot
if(slot_size(current_slot) == 0) {
heap.pop();
} else {
heap.pop_and_push(data[current_slot-group*setting_k]->read(), current_slot);
}
}
}
//restore mergebuffer
#ifndef TPIE_NDEBUG
std::cout << "memavail before mb alloc: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
mergebuffer.resize(setting_m*2);;
}
// Memory usage:
// Deallocates mergebuffer : -2*setting_m
// Opens newstream : sizeof(file_stream<T>)
// PQ merge heap : setting_k * (sizeof T + sizeof size_type)
// Opens old streams : setting_k * sizeof(file_stream<T>)
// Reallocates mergebuffer : +2*setting_m
// (no net heap usage since 2*setting_m > temporary heap usage)
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::empty_group(group_type group) {
if(group > setting_k) {
TP_LOG_FATAL_ID("Error: Priority queue is full");
throw exception("Priority queue is full");
}
// All slots are occupied. Empty this group by merging slots into a
// single free slot in group+1.
slot_type newslot = free_slot(group+1);
assert(slot_size(newslot) == 0);
slot_start_set(newslot, 0);
if(current_r < newslot/setting_k+1) {
// create a new group
current_r = newslot/setting_k+1;
}
bool ret = false;
mergebuffer.resize(0);
#ifndef TPIE_NDEBUG
std::cout << "memavail after mb free: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
{
file_stream<T> newstream(block_factor);
newstream.open(slot_data(newslot));
pq_merge_heap<T, Comparator> heap(setting_k);
// Open streams to slots in group `group', push top element to merge heap
tpie::array<tpie::auto_ptr<file_stream<T> > > data(setting_k);
for(memory_size_type i = 0; i<setting_k; i++) {
data[i].reset(tpie_new<file_stream<T> >(block_factor));
data[i]->open(slot_data(group*setting_k+i));
if(slot_size(group*setting_k+i) == 0) {
ret = true;
break;
}
assert(slot_size(group*setting_k+i)>0);
data[i]->seek(slot_start(group*setting_k+i));
heap.push(data[i]->read(), group*setting_k+i);
}
while(!heap.empty() && !ret) {
slot_type current_slot = heap.top_run();
newstream.write(heap.top());
slot_size_set(newslot,slot_size(newslot)+1);
slot_start_set(current_slot, slot_start(current_slot)+1);
slot_size_set(current_slot, slot_size(current_slot)-1);
if(slot_size(current_slot) == 0) {
heap.pop();
} else {
heap.pop_and_push(data[current_slot-group*setting_k]->read(), current_slot);
}
}
}
#ifndef TPIE_NDEBUG
std::cout << "memavail before mb alloc: "
<< get_memory_manager().available() << "b" << std::endl;
#endif
mergebuffer.resize(setting_m*2);;
if(group_size(group+1) > 0 && !ret) {
// Maintain heap invariant:
// group buffer i <= group i slots
// If the group buffer of the group in which we inserted runs
// was not empty before, we might now have violated a heap invariant
// by inserting elements in a [group+1] slot that are less than elements
// in group buffer [group+1].
// Just remove the group buffer to ensure the invariant.
remove_group_buffer(group+1); // todo, this might recurse?
}
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::validate() {
#ifndef NDEBUG
#ifdef PQ_VALIDATE
cout << "validate start" << "\n";
// validate size
stream_size_type size = 0;
size = size + opq->size();
size = size + buffer_size;
for(stream_size_type i = 0; i<setting_k;i++) {
size = size + group_size(i);
}
for(stream_size_type i = 0; i<setting_k*setting_k;i++) {
size = size + slot_size(i);
}
if(m_size != size) {
TP_LOG_FATAL_ID("Error: Validate: Size not ok");
exit(-1);
}
// validate internal order in "nodes"
if(buffer_size > 0) { // buffer
T last = buffer[buffer_start];
for(stream_size_type i = buffer_start; i<buffer_start+buffer_size;i++) {
if(comp_(buffer[i],last)) {
//Kasper and Mark: Should this exit(-1)?
TP_LOG_WARNING_ID("Error: Buffer ordered validation failed");
}
last = buffer[i];
}
}
// todo: validate gbuffer0
for(stream_size_type i = 1; i < setting_k; i++) { // groups, nb: cyclic
if(group_size(i) > 0) {
file_stream<T> stream;
stream.open(group_data(i));
stream.seek(group_start(i));
if(stream.offset() == setting_m) {
stream.seek(0);
}
T last = stream.read();
for(stream_size_type j = 1; j < group_size(i); j++) {
if(stream.offset() == setting_m) {
stream.seek(0);
}
T read = stream.read();
if(comp_(read, last)) { // compare
dump();
TP_LOG_FATAL_ID("Error: Group buffer " << i << " order invalid (last: " << last <<
", read: " << read << ")");
exit(-1);
}
}
delete stream;
}
}
for(stream_size_type i = 0; i < setting_k*setting_k; i++) { // slots
if(slot_size(i) > 0){
file_stream<T> stream;
stream.open(slot_data(i));
stream.seek(slot_start(i));
T last = stream.read();
for(stream_size_type j = 1; j < slot_size(i); j++) {
T read = stream.read();
if(comp_(read, last)) { // compare
TP_LOG_FATAL_ID("Error: Slot " << i << " order invalid (last: " << last <<
", read: " << read << ")");
exit(-1);
}
}
}
}
// validate heap properties
if(buffer_size > 0) { // buffer --> group buffers
T buf_max = buffer[buffer_start+buffer_size-1];
for(stream_size_type i = 1; i < setting_k; i++) { // todo: gbuffer0
if(group_size(i) > 0) {
file_stream<T> stream;
stream.open(group_data(i));
stream.seek(group_start(i));
if(stream->offset() == setting_m) {
stream.seek(0);
}
T first = stream.read();
if(comp_(first, buf_max)) { // compare
dump();
TP_LOG_FATAL_ID("Error: Heap property invalid, buffer -> group buffer " << i <<
"(buffer: " << buf_max << ", first: " << first << ")");
exit(-1);
}
}
}
}
// todo: gbuffer0
for(stream_size_type i = 1; i < setting_k; i++) { // group buffers --> slots
if(group_size(i) > 0) {
file_stream<T> stream;
stream.open(group_data(i));
stream.seek((group_start(i)+group_size(i)-1)%setting_m);
T item_group = stream.read();
//cout << "item_group: " << item_group << "\n";
for(stream_size_type j = i*setting_k; j<i*setting_k+setting_k;j++) {
if(slot_size(j) > 0) {
file_stream<T> stream;
stream.open(slot_data(j));
stream.seek(slot_start(j));
T item_slot = stream.read();
if(comp_(item_slot, item_group)) { // compare
dump();
TP_LOG_FATAL_ID("Error: Heap property invalid, group buffer " << i <<
" -> slot " << j << "(group: " << item_group <<
", slot: " << item_slot << ")");
exit(-1);
}
}
}
}
}
//cout << "validate end" << "\n";
#endif
#endif
}
// Empty a group buffer by inserting it into an empty group 0 slot.
// To maintain the invariant
// group buffer 0 elements <= group 0 slot elements,
// merge the given group buffer with group buffer 0 before writing the slot out.
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::remove_group_buffer(group_type group) {
#ifndef NDEBUG
if(group == 0) {
TP_LOG_FATAL_ID("Attempt to remove group buffer 0");
throw exception("Attempt to remove group buffer 0");
}
#endif
// this is the easiest thing to do
slot_type slot = free_slot(0);
if(group_size(group) == 0) return;
TP_LOG_DEBUG_ID("Remove group buffer " << group <<
" of size " << group_size(group) <<
" with available memory " << get_memory_manager().available());
assert(group < setting_k);
array<T> arr(static_cast<size_t>(group_size(group)));
file_stream<T> data(block_factor);
data.open(group_data(group));
data.seek(group_start(group));
memory_size_type size = group_size(group);
if(group_start(group) + group_size(group) <= static_cast<stream_size_type>(setting_m)) {
data.read(arr.begin(), arr.find(size));
} else {
// two reads
memory_size_type first_read = setting_m - group_start(group);
memory_size_type second_read = size - first_read;
data.read(arr.begin(), arr.find(first_read));
data.seek(0);
data.read(arr.find(first_read), arr.find(first_read+second_read));
}
assert(group_size(group) > 0);
// make sure that the new slot in group 0 is heap ordered with gbuffer0
if(group > 0 && group_size(0) != 0) {
memory_size_type j = 0;
for(memory_size_type i = group_start(0); i < group_start(0)+group_size(0); i++) {
mergebuffer[j] = gbuffer0[i%setting_m];
++j;
}
memcpy(&mergebuffer[j], &arr[0], static_cast<size_t>(sizeof(T)*group_size(group)));
std::sort(&mergebuffer[0], &mergebuffer[0]+(group_size(0)+group_size(group)), comp_);
memcpy(&gbuffer0[0], &mergebuffer[0], static_cast<size_t>(sizeof(T)*group_size(0)));
group_start_set(0,0);
memcpy(&arr[0], &mergebuffer[group_size(0)], static_cast<size_t>(sizeof(T)*group_size(group)));
}
write_slot(slot, arr.get(), group_size(group));
group_start_set(group, 0);
group_size_set(group, 0);
}
//////////////////
// TPIE wrappers
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::slot_start_set(slot_type slot, memory_size_type n) {
slot_state[slot*3] = n;
}
template <typename T, typename Comparator, typename OPQType>
memory_size_type priority_queue<T, Comparator, OPQType>::slot_start(slot_type slot) const {
return slot_state[slot*3];
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::slot_size_set(slot_type slot, memory_size_type n) {
assert(slot<setting_k*setting_k);
slot_state[slot*3+1] = n;
}
template <typename T, typename Comparator, typename OPQType>
memory_size_type priority_queue<T, Comparator, OPQType>::slot_size(slot_type slot) const {
return slot_state[slot*3+1];
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::group_start_set(group_type group, memory_size_type n) {
group_state[group*2] = n;
}
template <typename T, typename Comparator, typename OPQType>
memory_size_type priority_queue<T, Comparator, OPQType>::group_start(group_type group) const {
return group_state[group*2];
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::group_size_set(group_type group, memory_size_type n) {
assert(group<setting_k);
group_state[group*2+1] = n;
}
template <typename T, typename Comparator, typename OPQType>
memory_size_type priority_queue<T, Comparator, OPQType>::group_size(group_type group) const {
return group_state[group*2+1];
}
template <typename T, typename Comparator, typename OPQType>
temp_file & priority_queue<T, Comparator, OPQType>::slot_data(slot_type slotid) {
return datafiles[slot_state[slotid*3+2]];
}
template <typename T, typename Comparator, typename OPQType>
void priority_queue<T, Comparator, OPQType>::slot_data_set(slot_type slotid, memory_size_type n) {
slot_state[slotid*3+2] = n;
}
template <typename T, typename Comparator, typename OPQType>
temp_file & priority_queue<T, Comparator, OPQType>::group_data(group_type groupid) {
return groupdatafiles[groupid];
}
template <typename T, typename Comparator, typename OPQType>
memory_size_type priority_queue<T, Comparator, OPQType>::slot_max_size(slot_type slotid) {
// todo, too many casts
return setting_m