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root/OpenMD/trunk/src/brains/BlockSnapshotManager.cpp
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Comparing trunk/src/brains/BlockSnapshotManager.cpp (file contents):
Revision 347 by tim, Tue Feb 15 17:11:35 2005 UTC vs.
Revision 507 by gezelter, Fri Apr 15 22:04:00 2005 UTC

# Line 40 | Line 40
40   */
41   #include <algorithm>
42   #include "brains/BlockSnapshotManager.hpp"
43 + #include "utils/residentMem.h"
44   #include "utils/physmem.h"
45   #include "utils/Algorithm.hpp"
46   #include "brains/SimInfo.hpp"
47   #include "io/DumpReader.hpp"
48  
49   namespace oopse {
50 < BlockSnapshotManager::BlockSnapshotManager(SimInfo* info, const std::string& filename,
51 <    int storageLayout, int blockCapacity)
52 <    : SnapshotManager(storageLayout), info_(info), blockCapacity_(blockCapacity), activeBlocks_(blockCapacity_, -1) {
50 >  BlockSnapshotManager::BlockSnapshotManager(SimInfo* info, const std::string& filename,
51 >                                             int storageLayout, int blockCapacity)
52 >    : SnapshotManager(storageLayout), info_(info), blockCapacity_(blockCapacity),
53 >      activeBlocks_(blockCapacity_, -1), activeRefCount_(blockCapacity_, 0) {
54  
55 <    nAtoms_ = info->getNGlobalAtoms();
56 <    nRigidBodies_ = info->getNGlobalRigidBodies();
55 >      nAtoms_ = info->getNGlobalAtoms();
56 >      nRigidBodies_ = info->getNGlobalRigidBodies();
57  
58 <    double avalPhysMem = physmem_available();
58 >      double physMem = physmem_total();
59 >      double rssMem = residentMem();
60 >      double avaliablePhysMem = physMem - rssMem;
61      
62 <    int bytesPerStuntDouble = DataStorage::getBytesPerStuntDouble(storageLayout);
62 >      int bytesPerStuntDouble = DataStorage::getBytesPerStuntDouble(storageLayout);
63  
64 <    int bytesPerFrame = (nRigidBodies_ + nAtoms_) * bytesPerStuntDouble;
64 >      int bytesPerFrame = (nRigidBodies_ + nAtoms_) * bytesPerStuntDouble;
65  
66 <    int frameCapacity = int (avalPhysMem / bytesPerFrame);
66 >      int frameCapacity = int (avaliablePhysMem / bytesPerFrame);
67      
68 <    nSnapshotPerBlock_ = frameCapacity /blockCapacity_ ;
68 >      nSnapshotPerBlock_ = frameCapacity /blockCapacity_ ;
69 >      reader_ = new DumpReader(info, filename);
70 >      nframes_ = reader_->getNFrames();
71  
72 <    reader_ = new DumpReader(info, filename);
73 <    nframes_ = reader_->getNFrames();
68 <
69 <    int nblocks = nframes_ / nSnapshotPerBlock_;
70 <    if (nframes_ % nSnapshotPerBlock_ != 0) {
72 >      int nblocks = nframes_ / nSnapshotPerBlock_;
73 >      if (nframes_ % nSnapshotPerBlock_ != 0) {
74          ++nblocks;
75 <    }  
75 >      }  
76      
77 <    for (int i = 0; i < nblocks; ++i) {
77 >      for (int i = 0; i < nblocks; ++i) {
78          blocks_.push_back(SnapshotBlock(i*nSnapshotPerBlock_, (i+1)*nSnapshotPerBlock_));    
79 <    }
80 <    //the last block may not have nSnapshotPerBlock frames, we need to consider this special situation
81 <    blocks_.back().second = nframes_;
79 >      }
80 >      //the last block may not have nSnapshotPerBlock frames, we need to consider this special situation
81 >      blocks_.back().second = nframes_;
82  
83 <    snapshots_.insert(snapshots_.begin(), nframes_, static_cast<Snapshot*>(NULL));  
83 >      snapshots_.insert(snapshots_.begin(), nframes_, static_cast<Snapshot*>(NULL));  
84 >
85 >      std::cout << "physmem = " << int(physMem) << "\trssMem =  "<< int(rssMem) << "\t availablePhysMem = " << int(avaliablePhysMem) <<std::endl;
86 >      std::cout << "nSnapshotPerBlock = " << nSnapshotPerBlock_ << "\t total block = " << nblocks << std::endl;
87      
88 < }
88 >    }
89  
90  
91 < BlockSnapshotManager::~BlockSnapshotManager() {
91 >  BlockSnapshotManager::~BlockSnapshotManager() {
92      currentSnapshot_ = NULL;
93      previousSnapshot_ = NULL;
94      
# Line 90 | Line 96 | BlockSnapshotManager::~BlockSnapshotManager() {
96  
97      std::vector<int>::iterator i;
98      for (i = activeBlocks_.begin(); i != activeBlocks_.end(); ++i) {
99 <        if (*i != -1) {
100 <            unloadBlock(*i);
101 <        }
99 >      if (*i != -1) {
100 >        unloadBlock(*i);
101 >      }
102      }
103 < }
103 >  }
104  
105 < int BlockSnapshotManager::getNActiveBlocks() {
105 >  int BlockSnapshotManager::getNActiveBlocks() {
106   #ifdef __RWSTD  
107      int count = 0;
108      std::count_if(activeBlocks_.begin(), activeBlocks_.end(), std::bind2nd(std::not_equal_to<int>(), -1), count);
# Line 104 | Line 110 | int BlockSnapshotManager::getNActiveBlocks() {
110   #else
111      return std::count_if(activeBlocks_.begin(), activeBlocks_.end(), std::bind2nd(std::not_equal_to<int>(), -1));
112   #endif
113 < }
113 >  }
114  
109 – bool BlockSnapshotManager::isBlockActive(int block) {
110 –    return std::find(activeBlocks_.begin(), activeBlocks_.end(), block) != activeBlocks_.end() ? true : false;
111 – }
115  
116 < bool BlockSnapshotManager::loadBlock(int block) {
116 >
117 >  bool BlockSnapshotManager::loadBlock(int block) {
118 >    std::vector<int>::iterator i = findActiveBlock(block);
119      bool loadSuccess;
120 <    if (isBlockActive(block)) {
121 <        loadSuccess = true;
120 >    if (i != activeBlocks_.end()) {
121 >      //if block is already in memory, just increast the reference count
122 >      ++activeRefCount_[i - activeBlocks_.begin()];
123 >      loadSuccess = true;
124      } else if (getNActiveBlocks() < blockCapacity_){
125 <
126 <        for (int i = blocks_[block].first; i < blocks_[block].second; ++i) {
127 <            snapshots_[i] = loadFrame(i);
128 <        }
129 <        
130 <        std::vector<int>::iterator j;
131 <        j = std::find(activeBlocks_.begin(), activeBlocks_.end(), -1);
132 <        assert(j != activeBlocks_.end());
133 <        *j = block;    
134 <        loadSuccess = true;
135 <    }else {
136 <        loadSuccess = false;
125 >      //if number of active blocks is less than the block capacity, just load it
126 >      internalLoad(block);
127 >      loadSuccess = true;
128 >    } else if (hasZeroRefBlock() > 0) {
129 >      //if already reach the block capacity, need to unload a block with 0 reference
130 >      int zeroRefBlock = getFirstZeroRefBlock();
131 >      assert(zeroRefBlock != -1);
132 >      internalUnload(zeroRefBlock);
133 >      internalLoad(block);
134 >    } else {
135 >      //reach the capacity and all blocks in memory are not zero reference
136 >      loadSuccess = false;
137      }
138 <
138 >    
139      return loadSuccess;
140 < }
140 >  }
141  
142 < bool BlockSnapshotManager::unloadBlock(int block) {
142 >  bool BlockSnapshotManager::unloadBlock(int block) {
143      bool unloadSuccess;
144 <    if (!isBlockActive(block)){
145 <        unloadSuccess = false;
144 >    std::vector<int>::iterator i = findActiveBlock(block);
145 >    
146 >    if (i != activeBlocks_.end()){
147 >      --activeRefCount_[i - activeBlocks_.begin()];
148 >      if (activeRefCount_[i - activeBlocks_.begin()] < 0) {
149 >        //in case, unloadBlock called multiple times
150 >        activeRefCount_[i - activeBlocks_.begin()]  = 0;
151 >      }
152 >        
153 >      unloadSuccess = true;
154      } else {
155 <        for (int i = blocks_[block].first; i < blocks_[block].second; ++i) {
141 <            delete snapshots_[i];
142 <            snapshots_[i] = NULL;
143 <        }
144 <        std::vector<int>::iterator j;
145 <        j = std::find(activeBlocks_.begin(), activeBlocks_.end(), block);
146 <        assert(j != activeBlocks_.end());
147 <        *j = -1;
148 <        unloadSuccess = true;
155 >      unloadSuccess = false;
156      }
157  
158      return unloadSuccess;
159 < }
159 >  }
160  
161 < std::vector<int> BlockSnapshotManager::getActiveBlocks() {
161 >  void BlockSnapshotManager::internalLoad(int block) {
162 >        
163 >    for (int i = blocks_[block].first; i < blocks_[block].second; ++i) {
164 >      snapshots_[i] = loadFrame(i);
165 >    }
166 >    
167 >    std::vector<int>::iterator j;
168 >    j = std::find(activeBlocks_.begin(), activeBlocks_.end(), -1);
169 >    assert(j != activeBlocks_.end());
170 >    *j = block;    
171 >    ++activeRefCount_[j - activeBlocks_.begin()];
172 >  }
173 >
174 >  void BlockSnapshotManager::internalUnload(int block) {
175 >    for (int i = blocks_[block].first; i < blocks_[block].second; ++i) {
176 >      delete snapshots_[i];
177 >      snapshots_[i] = NULL;
178 >    }
179 >    std::vector<int>::iterator j;
180 >    j = std::find(activeBlocks_.begin(), activeBlocks_.end(), block);
181 >    assert(j != activeBlocks_.end());
182 >    *j = -1;
183 >  }
184 >
185 >  bool BlockSnapshotManager::hasZeroRefBlock(){
186 >    return std::find(activeRefCount_.begin(), activeRefCount_.end(), 0) != activeRefCount_.end() ?  true : false;
187 >  }
188 >
189 >  int BlockSnapshotManager::getFirstZeroRefBlock(){
190 >    std::vector<int>::iterator i = std::find(activeRefCount_.begin(), activeRefCount_.end(), 0);
191 >    return i != activeRefCount_.end() ? activeBlocks_[i - activeRefCount_.begin()] : -1;
192 >  }
193 >
194 >  std::vector<int> BlockSnapshotManager::getActiveBlocks() {
195      std::vector<int> result;
196      oopse::copy_if(activeBlocks_.begin(), activeBlocks_.end(), std::back_inserter(result),
197 <        std::bind2nd(std::not_equal_to<int>(), -1));
197 >                   std::bind2nd(std::not_equal_to<int>(), -1));
198      return result;    
199 < }
199 >  }
200  
201 < Snapshot* BlockSnapshotManager::loadFrame(int frame){
201 >  Snapshot* BlockSnapshotManager::loadFrame(int frame){
202      Snapshot* snapshot = new Snapshot(nAtoms_, nRigidBodies_, getStorageLayout());
203      snapshot->setID(frame);
204      
# Line 168 | Line 208 | Snapshot* BlockSnapshotManager::loadFrame(int frame){
208      reader_->readFrame(frame);
209      currentSnapshot_ = oldSnapshot;
210      return snapshot;
211 < }
211 >  }
212  
213 < int BlockSnapshotManager::getNFrames() {
213 >  int BlockSnapshotManager::getNFrames() {
214      return reader_->getNFrames();
215 < }
215 >  }
216  
217   }

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