71 lines
2.8 KiB
Plaintext
71 lines
2.8 KiB
Plaintext
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//========================================================================================================================================================================================================200
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// findRangeK function
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//========================================================================================================================================================================================================200
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__global__ void
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findRangeK( long height,
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knode *knodesD,
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long knodes_elem,
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long *currKnodeD,
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long *offsetD,
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long *lastKnodeD,
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long *offset_2D,
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int *startD,
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int *endD,
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int *RecstartD,
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int *ReclenD)
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{
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// private thread IDs
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int thid = threadIdx.x;
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int bid = blockIdx.x;
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// ???
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int i;
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for(i = 0; i < height; i++){
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if((knodesD[currKnodeD[bid]].keys[thid] <= startD[bid]) && (knodesD[currKnodeD[bid]].keys[thid+1] > startD[bid])){
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// this conditional statement is inserted to avoid crush due to but in original code
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// "offset[bid]" calculated below that later addresses part of knodes goes outside of its bounds cause segmentation fault
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// more specifically, values saved into knodes->indices in the main function are out of bounds of knodes that they address
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if(knodesD[currKnodeD[bid]].indices[thid] < knodes_elem){
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offsetD[bid] = knodesD[currKnodeD[bid]].indices[thid];
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}
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}
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if((knodesD[lastKnodeD[bid]].keys[thid] <= endD[bid]) && (knodesD[lastKnodeD[bid]].keys[thid+1] > endD[bid])){
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// this conditional statement is inserted to avoid crush due to but in original code
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// "offset_2[bid]" calculated below that later addresses part of knodes goes outside of its bounds cause segmentation fault
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// more specifically, values saved into knodes->indices in the main function are out of bounds of knodes that they address
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if(knodesD[lastKnodeD[bid]].indices[thid] < knodes_elem){
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offset_2D[bid] = knodesD[lastKnodeD[bid]].indices[thid];
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}
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}
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__syncthreads();
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// set for next tree level
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if(thid==0){
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currKnodeD[bid] = offsetD[bid];
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lastKnodeD[bid] = offset_2D[bid];
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}
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__syncthreads();
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}
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// Find the index of the starting record
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if(knodesD[currKnodeD[bid]].keys[thid] == startD[bid]){
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RecstartD[bid] = knodesD[currKnodeD[bid]].indices[thid];
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}
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__syncthreads();
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// Find the index of the ending record
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if(knodesD[lastKnodeD[bid]].keys[thid] == endD[bid]){
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ReclenD[bid] = knodesD[lastKnodeD[bid]].indices[thid] - RecstartD[bid]+1;
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}
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}
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//========================================================================================================================================================================================================200
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// End
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//========================================================================================================================================================================================================200
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