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unionFindLib.C
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unionFindLib.C
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#include <assert.h>
#include "prefixBalance.h"
#include "unionFindLib.h"
/*readonly*/ CProxy_UnionFindLib _UfLibProxy;
/*readonly*/ CProxy_Prefix prefixLibArray;
/*readonly*/ CkGroupID libGroupID;
CkReduction::reducerType mergeCountMapsReductionType;
// custom reduction for merging local count maps
CkReductionMsg* merge_count_maps(int nMsgs, CkReductionMsg **msgs) {
std::unordered_map<long int,int> merged_temp_map;
for (int i = 0; i < nMsgs; i++) {
// any sanity check for map size?
// extract this message's local map
componentCountMap *curr_map = (componentCountMap*)msgs[i]->getData();
int numComps = msgs[i]->getSize();
numComps = numComps / sizeof(componentCountMap);
// convert custom map to STL map for easier lookup
for (int j = 0; j < numComps; j++) {
merged_temp_map[curr_map[j].compNum] += curr_map[j].count;
}
} // all messages processed
// convert the STL back to custom map for messaging
componentCountMap *merged_map = new componentCountMap[merged_temp_map.size()];
std::unordered_map<long int,int>::iterator iter = merged_temp_map.begin();
for (int i = 0; i < merged_temp_map.size(); i++) {
componentCountMap entry;
entry.compNum = iter->first;
entry.count = iter->second;
merged_map[i] = entry;
iter++;
}
int retSize = sizeof(componentCountMap) * merged_temp_map.size();
return CkReductionMsg::buildNew(retSize, merged_map);
}
// initnode function to register reduction
static void register_merge_count_maps_reduction() {
mergeCountMapsReductionType = CkReduction::addReducer(merge_count_maps);
}
// class function implementations
void UnionFindLib::
registerGetLocationFromID(std::pair<int, int> (*gloc)(long int vid)) {
getLocationFromID = gloc;
}
void UnionFindLib::
register_phase_one_cb(CkCallback cb) {
if (thisIndex != 0)
CkAbort("[UnionFindLib] Phase 1 callback must be registered on first chare only!");
CkStartQD(cb);
}
void UnionFindLib::
initialize_vertices(unionFindVertex *appVertices, int numVertices) {
// local vertices corresponding to one treepiece in application
numMyVertices = numVertices;
myVertices = appVertices; // no need to do memcpy, array in same address space as app
/*myVertices = (unionFindVertex*)malloc(numVertices * sizeof(unionFindVertex));
memcpy(myVertices, appVertices, sizeof(unionFindVertex)*numVertices);*/
/*for (int i = 0; i < numMyVertices; i++) {
CkPrintf("[LibProxy %d] myVertices[%d] - vertexID: %ld, parent: %ld, component: %d\n", this->thisIndex, i, myVertices[i].vertexID, myVertices[i].parent, myVertices[i].componentNumber);
}*/
}
#ifndef ANCHOR_ALGO
void UnionFindLib::
union_request(long int vid1, long int vid2) {
if (vid2 < vid1) {
// found a back edge, flip and reprocess
union_request(vid2, vid1);
}
else {
//std::pair<int,int> vid1_loc = appPtr->getLocationFromID(vid1);
std::pair<int, int> vid1_loc = getLocationFromID(vid1);
//message the chare containing first vertex to find boss1
//pass the initilizer ID for initiating path compression
findBossData d;
d.arrIdx = vid1_loc.second;
d.partnerOrBossID = vid2;
d.senderID = -1; // TODO: Is this okay? Or use INT_MIN
d.isFBOne = 1;
this->thisProxy[vid1_loc.first].insertDataFindBoss(d);
//for profiling
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();
}
}
#else
void UnionFindLib::
union_request(long int v, long int w) {
std::pair<int, int> w_loc = getLocationFromID(w);
// message w to anchor to v
anchorData d;
d.arrIdx = w_loc.second;
d.v = v;
thisProxy[w_loc.first].insertDataAnchor(d);
}
#endif
#ifndef ANCHOR_ALGO
void UnionFindLib::
find_boss1(int arrIdx, long int partnerID, long int senderID) {
unionFindVertex *src = &myVertices[arrIdx];
src->findOrAnchorCount++;
if (src->parent == -1) {
//boss1 found
std::pair<int, int> partner_loc = getLocationFromID(partnerID);
//message the chare containing the partner
//senderID for first find_boss2 is not relevant, similar to first find_boss1
findBossData d;
d.arrIdx = partner_loc.second;
d.partnerOrBossID = src->vertexID;
d.senderID = -1;
d.isFBOne = 0;
this->thisProxy[partner_loc.first].insertDataFindBoss(d);
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();
//message the initID to kick off path compression in boss1's chain
/*std::pair<int,int> init_loc = appPtr->getLocationFromID(initID);
this->thisProxy[init_loc.first].compress_path(init_loc.second, src->vertexID);
libGroup.ckLocalBranch()->increase_message_count();*/
}
else {
//boss1 not found, move to parent
std::pair<int, int> parent_loc = getLocationFromID(src->parent);
unionFindVertex *path_base = src;
unionFindVertex *parent, *curr = src;
/* Locality based optimization code:
instead of using messages to traverse the tree, this
technique uses a while loop to reach the top of "local" tree i.e
the last node in the tree path that is locally present on current chare
We combine this with a local path compression optimization to make
all local trees completely shallow
*/
while (parent_loc.first == this->thisIndex) {
parent = &myVertices[parent_loc.second];
// entire tree is local to chare
if (parent->parent == -1) {
local_path_compression(path_base, parent->vertexID);
findBossData d;
d.arrIdx = parent_loc.second;
d.partnerOrBossID = partnerID;
d.senderID = curr->vertexID;
d.isFBOne = 1;
this->insertDataFindBoss(d);
return;
}
// move pointers to traverse tree
curr = parent;
parent_loc = getLocationFromID(curr->parent);
} //end of local tree climbing
if (path_base->vertexID != curr->vertexID) {
local_path_compression(path_base, curr->vertexID);
}
else {
//CkPrintf("Self-pointing bug avoided\n");
}
CkAssert(parent_loc.first != this->thisIndex);
//message remote chare containing parent, set the senderID to curr
findBossData d;
d.arrIdx = parent_loc.second;
d.partnerOrBossID = partnerID;
d.senderID = curr->vertexID;
d.isFBOne = 1;
this->thisProxy[parent_loc.first].insertDataFindBoss(d);
// check if sender and current vertex are on different chares
if (senderID != -1 && !check_same_chares(senderID, curr->vertexID)) {
// short circuit the sender to point to grandparent
std::pair<int,int> sender_loc = getLocationFromID(senderID);
shortCircuitData scd;
scd.arrIdx = sender_loc.second;
scd.grandparentID = curr->parent;
thisProxy[sender_loc.first].short_circuit_parent(scd);
}
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();
}
}
void UnionFindLib::
find_boss2(int arrIdx, long int boss1ID, long int senderID) {
unionFindVertex *src = &myVertices[arrIdx];
src->findOrAnchorCount++;
if (src->parent == -1) {
if (boss1ID > src->vertexID) {
//do not point to somebody greater than you, min-heap property (mostly a cycle edge?)
union_request(boss1ID, src->vertexID); // flipped and reprocessed
}
else {
//valid edge
if (boss1ID != src->vertexID) {//avoid self-loop
src->parent = boss1ID;
//message initID to start path compression in boss2's chain
/*std::pair<int,int> init_loc = appPtr->getLocationFromID(initID);
this->thisProxy[init_loc.first].compress_path(init_loc.second, boss1ID);
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();*/
}
}
}
else {
//boss2 not found, move to parent
//std::pair<int,int> parent_loc = appPtr->getLocationFromID(src->parent);
std::pair<int, int> parent_loc = getLocationFromID(src->parent);
unionFindVertex *path_base = src;
unionFindVertex *parent, *curr = src;
// same optimizations as in find_boss1
while (parent_loc.first == this->thisIndex) {
parent = &myVertices[parent_loc.second];
if (parent->parent == -1) {
local_path_compression(path_base, parent->vertexID);
// find_boss2(parent_loc.second, boss1ID, initID);
findBossData d;
d.arrIdx = parent_loc.second;
d.partnerOrBossID = boss1ID;
d.senderID = curr->vertexID;
d.isFBOne = 0;
this->insertDataFindBoss(d);
return;
}
curr = parent;
parent_loc = getLocationFromID(curr->parent);
} //end of local tree climbing
if (path_base->vertexID != curr->vertexID) {
local_path_compression(path_base, curr->vertexID);
}
else {
//CkPrintf("Self-pointing bug avoided\n");
}
CkAssert(parent_loc.first != this->thisIndex);
//message remote chare containing parent
findBossData d;
d.arrIdx = parent_loc.second;
d.partnerOrBossID = boss1ID;
d.senderID = curr->vertexID;
d.isFBOne = 0;
this->thisProxy[parent_loc.first].insertDataFindBoss(d);
// check if sender and current vertex are on different chares
if (senderID != -1 && !check_same_chares(senderID, curr->vertexID)) {
// short circuit the sender to point to grandparent
std::pair<int,int> sender_loc = getLocationFromID(senderID);
shortCircuitData scd;
scd.arrIdx = sender_loc.second;
scd.grandparentID = curr->parent;
thisProxy[sender_loc.first].short_circuit_parent(scd);
}
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();
}
}
#else
void UnionFindLib::
anchor(int w_arrIdx, long int v, long int path_base_arrIdx) {
unionFindVertex *w = &myVertices[w_arrIdx];
w->findOrAnchorCount++;
if (w->parent == v) {
// call local_path_compression with v as parent
if (path_base_arrIdx != -1) {
unionFindVertex *path_base = &myVertices[path_base_arrIdx];
local_path_compression(path_base, v);
}
return;
}
if (w->vertexID < v) {
// incorrect order, swap the vertices
std::pair<int, int> v_loc = getLocationFromID(v);
if (v_loc.first == thisIndex) {
// vertex available locally, avoid extra message
if (path_base_arrIdx != -1) {
// Have to change the direction; so compress path for w
unionFindVertex *path_base = &myVertices[path_base_arrIdx];
// FIXME: what happens if w is not in this chare?
local_path_compression(path_base, w->vertexID);
}
// start a new base since I am changing direction; can't carry the old one
path_base_arrIdx = v_loc.second;
// anchor(v_loc.second, w->parent, path_base_arrIdx);
anchor(v_loc.second, w->parent, -1);
return;
}
anchorData d;
d.arrIdx = v_loc.second;
d.v = w->parent;
thisProxy[v_loc.first].insertDataAnchor(d);;
}
else if (w->parent == w->vertexID) {
// I have reached the root; check if I can call local_path_compression
if (path_base_arrIdx != -1) {
unionFindVertex *path_base = &myVertices[path_base_arrIdx];
// Make all nodes point to this parent v
local_path_compression(path_base, v);
}
w->parent = v;
}
else {
// call anchor for w's parent
std::pair<int, int> w_parent_loc = getLocationFromID(w->parent);
if (w_parent_loc.first == thisIndex) {
if (path_base_arrIdx == -1) {
// Start from w; a wasted call if there is only one node and its child in the PE
std::pair<int, int> w_loc = getLocationFromID(w->vertexID);
path_base_arrIdx = w_loc.second;
}
else {
std::pair<int, int> w_loc = getLocationFromID(w->vertexID);
// assert (path_base_arrIdx != w_loc.second);
}
// anchor(w_parent_loc.second, v, -1);
anchor(w_parent_loc.second, v, path_base_arrIdx);
return;
}
else {
// Moving aay from this node; see if local_path_compression should be done
if (path_base_arrIdx != -1) {
unionFindVertex *path_base = &myVertices[path_base_arrIdx];
// Make all nodes point to this parent w
assert (path_base->vertexID != w->vertexID);
local_path_compression(path_base, w->vertexID);
}
}
anchorData d;
d.arrIdx = w_parent_loc.second;
d.v = v;
thisProxy[w_parent_loc.first].insertDataAnchor(d);
}
}
#endif
// perform local path compression
void UnionFindLib::
local_path_compression(unionFindVertex *src, long int compressedParent) {
unionFindVertex* tmp;
// An infinite loop if this function is called on itself (a node which does not have itself as its parent)
while (src->parent != compressedParent) {
// CkPrintf("Stuck here\n");
tmp = &myVertices[getLocationFromID(src->parent).second];
src->parent = compressedParent;
src =tmp;
}
}
// check if two vertices are on same chare
bool UnionFindLib::
check_same_chares(long int v1, long int v2) {
std::pair<int,int> v1_loc = getLocationFromID(v1);
std::pair<int,int> v2_loc = getLocationFromID(v2);
if (v1_loc.first == v2_loc.first)
return true;
return false;
}
// short circuit a vertex to point to grandparent
void UnionFindLib::
short_circuit_parent(shortCircuitData scd) {
unionFindVertex *src = &myVertices[scd.arrIdx];
//CkPrintf("[TP %d] Short circuiting %ld from current parent %ld to grandparent %ld\n", thisIndex, src->vertexID, src->parent, grandparentID);
src->parent = scd.grandparentID;
}
// function to implement simple path compression; currently unused
void UnionFindLib::
compress_path(int arrIdx, long int compressedParent) {
unionFindVertex *src = &myVertices[arrIdx];
//message the parent before reseting it
if (src->vertexID != compressedParent) {//reached the top of path
std::pair<int, int> parent_loc = getLocationFromID(src->parent);
this->thisProxy[parent_loc.first].compress_path(parent_loc.second, compressedParent);
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->increase_message_count();
src->parent = compressedParent;
}
}
unionFindVertex* UnionFindLib::
return_vertices() {
return myVertices;
}
/** Functions for finding connected components **/
void UnionFindLib::
find_components(CkCallback cb) {
postComponentLabelingCb = cb;
// count local numBosses
myLocalNumBosses = 0;
for (int i = 0; i < numMyVertices; i++) {
#ifndef ANCHOR_ALGO
if (myVertices[i].parent == -1) {
#else
// for Anchor algo, each vertex is ititially the parent of itself
if (myVertices[i].parent == myVertices[i].vertexID) {
#endif
myLocalNumBosses += 1;
}
}
// send local count to prefix library
CkCallback doneCb(CkReductionTarget(UnionFindLib, boss_count_prefix_done), thisProxy);
Prefix* myPrefixElem = prefixLibArray[thisIndex].ckLocal();
myPrefixElem->startPrefixCalculation(myLocalNumBosses, doneCb);
//CkPrintf("[%d] Local num bosses: %d\n", thisIndex, myLocalNumBosses);
}
// Recveive total boss count from prefix library and start labelling phase
void UnionFindLib::
boss_count_prefix_done(int totalCount) {
totalNumBosses = totalCount;
// access value from prefix lib elem to find starting index
Prefix* myPrefixElem = prefixLibArray[thisIndex].ckLocal();
int v = myPrefixElem->getValue();
int myStartIndex = v - myLocalNumBosses;
//CkPrintf("[%d] My start index: %d\n", thisIndex, myStartIndex);
// start labeling my local bosses from myStartIndex
// ensures sequential numbering of components
if (myLocalNumBosses != 0) {
for (int i = 0; i < numMyVertices; i++) {
#ifndef ANCHOR_ALGO
if (myVertices[i].parent == -1) {
#else
if (myVertices[i].parent == myVertices[i].vertexID) {
#endif
myVertices[i].componentNumber = myStartIndex;
myStartIndex++;
}
}
}
CkAssert(myStartIndex == v);
// start the labeling phase for all vertices
start_component_labeling();
}
void UnionFindLib::
start_component_labeling() {
for (int i = 0; i < numMyVertices; i++) {
unionFindVertex *v = &myVertices[i];
#ifndef ANCHOR_ALGO
if (v->parent == -1) {
#else
if (v->parent == v->vertexID) {
#endif
// one of the bosses/root found
CkAssert(v->componentNumber != -1); // phase 2a assigned serial numbers
set_component(i, v->componentNumber);
}
if (v->componentNumber == -1) {
// an internal node or leaf node, request parent for boss
std::pair<int, int> parent_loc = getLocationFromID(v->parent);
//this->thisProxy[parent_loc.first].need_boss(parent_loc.second, v->vertexID);
uint64_t data = ((uint64_t) parent_loc.second) << 32 | ((uint64_t) v->vertexID);
this->thisProxy[parent_loc.first].insertDataNeedBoss(data);
}
}
if (this->thisIndex == 0) {
// return back to application after completing all messaging related to
// connected components algorithm
CkStartQD(postComponentLabelingCb);
}
}
void UnionFindLib::
insertDataFindBoss(const findBossData & data) {
#ifndef ANCHOR_ALGO
if (data.isFBOne == 1) {
this->find_boss1(data.arrIdx, data.partnerOrBossID, data.senderID);
}
else {
this->find_boss2(data.arrIdx, data.partnerOrBossID, data.senderID);
}
#endif
}
void UnionFindLib::
insertDataNeedBoss(const uint64_t & data) {
int arrIdx = (int)(data >> 32);
long int fromID = (long int)(data & 0xffffffff);
this->need_boss(arrIdx, fromID);
}
#ifdef ANCHOR_ALGO
void UnionFindLib::
insertDataAnchor(const anchorData & data) {
anchor(data.arrIdx, data.v, -1);
}
#endif
void UnionFindLib::
need_boss(int arrIdx, long int fromID) {
// one of children of this node needs boss, handle by either replying immediately
// or queueing the request
if (myVertices[arrIdx].componentNumber != -1) {
// component already set, reply back
std::pair<int, int> requestor_loc = getLocationFromID(fromID);
if (requestor_loc.first == thisIndex)
set_component(requestor_loc.second, myVertices[arrIdx].componentNumber);
else
this->thisProxy[requestor_loc.first].set_component(requestor_loc.second, myVertices[arrIdx].componentNumber);
}
else {
// boss still not found, queue the request
myVertices[arrIdx].need_boss_requests.push_back(fromID);
}
}
void UnionFindLib::
set_component(int arrIdx, long int compNum) {
myVertices[arrIdx].componentNumber = compNum;
// since component number is set, respond to your requestors
std::vector<long int>::iterator req_iter = myVertices[arrIdx].need_boss_requests.begin();
while (req_iter != myVertices[arrIdx].need_boss_requests.end()) {
long int requestorID = *req_iter;
std::pair<int, int> requestor_loc = getLocationFromID(requestorID);
if (requestor_loc.first == thisIndex)
set_component(requestor_loc.second, compNum);
else
this->thisProxy[requestor_loc.first].set_component(requestor_loc.second, compNum);
// done with current requestor, delete from request queue
req_iter = myVertices[arrIdx].need_boss_requests.erase(req_iter);
}
}
void UnionFindLib::
prune_components(int threshold, CkCallback appReturnCb) {
componentPruneThreshold = threshold;
//int *localCounts = new int[totalNumBosses]();
std::vector<int> localCounts(totalNumBosses, 0);
//if (localCounts == NULL) {
// CkAbort("We are out of memory!");
//}
for (int i = 0; i < numMyVertices; i++) {
long int bossID = myVertices[i].componentNumber;
CkAssert(bossID >= 0 && bossID < totalNumBosses);
localCounts[bossID]++;
}
//CkPrintf("[TP %d] localCounts constructed\n", thisIndex);
// bcast totalCounts to all group chares
CProxy_UnionFindLibGroup libGroupProxy(libGroupID);
CkCallback cb(CkReductionTarget(UnionFindLibGroup, build_component_count_array), libGroupProxy);
//contribute(sizeof(int)*totalNumBosses, localCounts, CkReduction::sum_int, cb);
contribute(localCounts, CkReduction::sum_int, cb);
//delete[] localCounts;
// start QD to return back to application
if (thisIndex == 0) {
CkStartQD(appReturnCb);
}
}
// reductiontarget from group => all component count arrays are ready
void UnionFindLib::
perform_pruning() {
CProxy_UnionFindLibGroup libGroup(libGroupID);
for (int i = 0; i < numMyVertices; i++) {
int myComponentCount = libGroup.ckLocalBranch()->get_component_count(myVertices[i].componentNumber);
if (myComponentCount <= componentPruneThreshold) {
myVertices[i].componentNumber = -1;
}
#ifdef PROFILING
//CkPrintf("Vertex ID : %d, count : %ld\n", myVertices[i].vertexID, myVertices[i].findOrAnchorCount);
#endif
}
if (thisIndex == 0) {
CkPrintf("Number of components found: %d\n", totalNumBosses);
int numPrunedComponents = 0;
for (int i = 0; i < totalNumBosses; i++) {
int compCount = libGroup.ckLocalBranch()->get_component_count(i);
if (compCount <= componentPruneThreshold) {
numPrunedComponents++;
}
}
//CkPrintf("Number of components after pruning: %d\n", totalNumBosses-numPrunedComponents);
}
#ifdef PROFILING
long int maxCount = -1;
for (int i = 0; i < numMyVertices; i++) {
if (myVertices[i].findOrAnchorCount > maxCount)
maxCount = myVertices[i].findOrAnchorCount;
}
CkCallback cb(CkReductionTarget(UnionFindLib, profiling_count_max), thisProxy[0]);
contribute(sizeof(long int), &maxCount, CkReduction::max_long, cb);
#endif
}
#ifdef PROFILING
void UnionFindLib::
profiling_count_max(long int maxCount) {
CkAssert(thisIndex == 0);
CkPrintf("Max number of find/anchor messages per vertex: %ld\n", maxCount);
}
#endif
// library group chare class definitions
void UnionFindLibGroup::
build_component_count_array(int *totalCounts, int numElems) {
//CkPrintf("[PE %d] Count array size: %d\n", thisIndex, numElems);
component_count_array = new int[numElems];
memcpy(component_count_array, totalCounts, sizeof(int)*numElems);
contribute(CkCallback(CkReductionTarget(UnionFindLib, perform_pruning), _UfLibProxy));
}
int UnionFindLibGroup::
get_component_count(long int component_id) {
return component_count_array[component_id];
}
void UnionFindLibGroup::
increase_message_count() {
thisPeMessages++;
}
void UnionFindLibGroup::
contribute_count() {
CkCallback cb(CkReductionTarget(UnionFindLibGroup, done_profiling), thisProxy);
contribute(sizeof(int), &thisPeMessages, CkReduction::sum_int, cb);
}
void UnionFindLibGroup::
done_profiling(int total_count) {
if (CkMyPe() == 0) {
CkPrintf("Phase 1 profiling done. Total number of messages is : %d\n", total_count);
CkExit();
}
}
// library initialization function
CProxy_UnionFindLib UnionFindLib::
unionFindInit(CkArrayID clientArray, int n) {
CkArrayOptions opts(n);
opts.bindTo(clientArray);
_UfLibProxy = CProxy_UnionFindLib::ckNew(opts, NULL);
// create prefix library array here, prefix library is used in Phase 1B
// Binding order: prefix -> unionFind -> app array
CkArrayOptions prefix_opts(n);
prefix_opts.bindTo(_UfLibProxy);
prefixLibArray = CProxy_Prefix::ckNew(n, prefix_opts);
libGroupID = CProxy_UnionFindLibGroup::ckNew();
return _UfLibProxy;
}
#include "unionFindLib.def.h"
/*------------------- Old Code: Reduction using custom structs & maps -----------------*/
#if 0
void UnionFindLib::
merge_count_results(int* totalCounts, int numElems) {
CkAssert(numElems == totalNumBosses);
for (int i = 0; i < numMyVertices; i++) {
int myComponentCount = totalCounts[myVertices[i].componentNumber];
if (myComponentCount <= componentPruneThreshold) {
myVertices[i].componentNumber = -1;
}
}
if (thisIndex == 0) {
CkPrintf("Number of components found: %d\n", numElems);
int numPrunedComponents = 0;
for (int i = 0; i < numElems; i++) {
if (totalCounts[i] <= componentPruneThreshold) {
numPrunedComponents++;
}
}
CkPrintf("Number of components after pruning: %d\n", numElems-numPrunedComponents);
}
}
void UnionFindLib::
prune_components(int threshold, CkCallback appReturnCb) {
//create a count map
// key: componentNumber
// value: local count of vertices belonging to component
componentPruneThreshold = threshold;
std::unordered_map<long int, int> temp_count;
// populate local count map
for (int i = 0; i < numMyVertices; i++) {
temp_count[myVertices[i].componentNumber]++;
}
// Sanity check
/*std::map<long int,int>::iterator it = temp_count.begin();
while (it != temp_count.end()) {
CkPrintf("[%d] %ld -> %d\n", this->thisIndex, it->first, it->second);
it++;
}*/
// convert STL map to custom map (array of structures)
// for contributing to reduction
componentCountMap *local_map = new componentCountMap[temp_count.size()];
std::unordered_map<long int,int>::iterator iter = temp_count.begin();
for (int j = 0; j < temp_count.size(); j++) {
if (iter == temp_count.end())
CkAbort("Something corrupted in map memory!\n");
componentCountMap entry;
entry.compNum = iter->first;
entry.count = iter->second;
local_map[j] = entry;
iter++;
}
CkCallback cb(CkIndex_UnionFindLib::merge_count_results(NULL), this->thisProxy);
int contributeSize = sizeof(componentCountMap) * temp_count.size();
this->contribute(contributeSize, local_map, mergeCountMapsReductionType, cb);
// start QD to return back to application
if (this->thisIndex == 0) {
CkStartQD(appReturnCb);
}
}
void UnionFindLib::
merge_count_results(CkReductionMsg *msg) {
//ask lib group to build map
CProxy_UnionFindLibGroup libGroup(libGroupID);
libGroup.ckLocalBranch()->build_component_count_map(msg, totalNumBosses);
for (int i = 0; i < numMyVertices; i++) {
// query the group chare to get component count
int myComponentCount = libGroup.ckLocalBranch()->get_component_count(myVertices[i].componentNumber);
CkAssert(myVertices[i].componentNumber < totalNumBosses);
if (myComponentCount <= componentPruneThreshold) {
// vertex belongs to a minor component, ignore by setting to -1
myVertices[i].componentNumber = -1;
}
}
}
// library group chare class definitions
void UnionFindLibGroup::
build_component_count_map(CkReductionMsg *msg, int numCompsOriginal) {
if (!map_built) {
componentCountMap *final_map = (componentCountMap*)msg->getData();
int numComps = msg->getSize();
numComps /= sizeof(componentCountMap);
if (CkMyPe() == 0) {
CkPrintf("Number of components found: %d\n", numComps);
CkPrintf("Number of components before pruning: %d\n", numCompsOriginal);
}
// convert custom map back to STL for quick lookup
for (int i = 0; i < numComps; i++) {
component_count_map[final_map[i].compNum] = final_map[i].count;
if (CkMyPe() == 0) {
CkPrintf("Component %d has %d vertices\n", final_map[i].compNum, final_map[i].count);
}
}
// map is built now on each PE, share among local chares
map_built = true;
}
}
#endif