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/* |
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====================================================================== |
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Header for N-way out-of-core merge sort for records with 3D keys. |
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|
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Lucerne University of Applied Sciences and Arts, |
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supported by the Swiss National Science Foundation (SNSF, #147053) |
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====================================================================== |
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|
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$Id: oocsort.h,v 1.16 2015/09/15 13:33:22 taschreg Exp taschreg $ |
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*/ |
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|
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#ifndef OOC_SORT_H |
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#define OOC_SORT_H |
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|
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#include "fvect.h" |
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#include <stdio.h> |
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|
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|
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/* Sort records in inFile and append to outFile by subdividing inFile |
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* into small blocks, sorting these in-core, and merging them out-of-core |
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* via a priority queue. |
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* |
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* This is implemented as a recursive (numBlk)-way sort; the input is |
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* successively split into numBlk smaller blocks until these are of size |
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* <= blkSize, i.e. small enough for in-core sorting, then merging the |
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* sorted blocks as the stack unwinds. The in-core sort is parallelised |
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* over numProc processes. |
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* |
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* Parameters are as follows: |
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* inFile Opened input file containing unsorted records |
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* outFile Opened output file containing sorted records |
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* numBlk Number of blocks to divide into / merge from |
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* blkSize Max block size and size of in-core sort buffer, in bytes |
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* numProc Number of parallel processes for in-core sort |
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* recSize Size of input records in bytes |
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* bbOrg Origin of bounding box containing record keys for Morton code |
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* bbSize Extent of bounding box containing record keys for Morton code |
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* key Callback to access 3D coords from records for Morton code |
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*/ |
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int OOC_Sort (FILE *inFile, FILE *outFile, unsigned numBlk, |
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unsigned long blkSize, unsigned numProc, unsigned recSize, |
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FVECT bbOrg, RREAL bbSize, RREAL *(*key)(const void*)); |
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#endif |
