（Re）的裝載R樹與spatialindex庫

我與spatialindex bulkloading的R樹（http://libspatialindex.github.com/）庫：（Re）的裝載R樹與spatialindex庫

string baseName = "streets"; 
size_t capacity = 10 * 1024 * 1024; 
bool bWriteThrough = false; 
indexIdentifier = 0; 

IStorageManager *disk = StorageManager::createNewDiskStorageManager(baseName, 512); 
fileInMem = StorageManager 
    ::createNewRandomEvictionsBuffer(*disk, capacity, bWriteThrough); 

// bulkLoads my tree 
bulkLoadRTree(); 

cout << "tree info:" << endl; 
cout << *tree << endl; 

delete disk;

以下是關於信息輸出內置樹：

Dimension: 2 
    Fill factor: 0.7 
    Index capacity: 100 
    Leaf capacity: 100 
    Tight MBRs: enabled 
    Near minimum overlap factor: 32 
    Reinsert factor: 0.3 
    Split distribution factor: 0.4 
    Utilization: 69% 
    Reads: 1 
    Writes: 35980 
    Hits: 0 
    Misses: 0 
    Tree height: 4 
    Number of data: 2482376 
    Number of nodes: 35979 
    Level 0 pages: 35463 
    Level 1 pages: 507 
    Level 2 pages: 8 
    Level 3 pages: 1 
    Splits: 0 
    Adjustments: 0 
    Query results: 0

現在我試圖加載我已經保存在磁盤：

IStorageManager *ldisk = StorageManager::loadDiskStorageManager(baseName); 
SpatialIndex::StorageManager::IBuffer* fileLoadBuffer = StorageManager 
    ::createNewRandomEvictionsBuffer(*ldisk, capacity, bWriteThrough); 

id_type id = 1; 
tree = RTree::loadRTree(*fileLoadBuffer, id); 
cout << *tree << endl;

和樹有隻有一個節點（樹的輸出是:)

Dimension: 2 
    Fill factor: 0.7 
    Index capacity: 100 
    Leaf capacity: 100 
    Tight MBRs: enabled 
    Near minimum overlap factor: 32 
    Reinsert factor: 0.3 
    Split distribution factor: 0.4 
    Utilization: 0% 
    Reads: 0 
    Writes: 0 
    Hits: 0 
    Misses: 0 
    Tree height: 1 
    Number of data: 0 
    Number of nodes: 1 
    Level 0 pages: 1 
    Splits: 0 
    Adjustments: 0 
    Query results: 0

我該怎麼做？爲什麼我不從磁盤加載整棵樹？

來源

2012-11-06 arthur

難道你也許不是同步更改到光盤？

另外，通常會執行樹上的磁盤，並且而不是在第一次訪問時完全讀取它。所以在這一點上，它不能報告準確的統計數據。

或者，也許你的bulkLoadRTree不使用fileInMem。

來源

2012-11-08 20:04:43

必須刪除對象才能將更改同步到光盤。 – arthur

一個人必須刪除fileInMem使頁面被進一步送回盤，並進一步送回刪除*磁盤。在刪除磁盤之前需要添加此行：

delete fileInMem

來源

2012-11-22 08:25:44 arthur

（Re）的裝載R樹與spatialindex庫

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