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Merged
iverase merged 1 commit into from
Nov 6, 2025
Merged

Improve DirectIO prefetch strategy in Lucene99 flat vector format #137670

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19 changes: 11 additions & 8 deletions .../org/elasticsearch/index/codec/vectors/es93/DirectIOCapableLucene99FlatVectorsFormat.java
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Original file line number Diff line number Diff line change
Expand Up @@ -266,22 +266,25 @@ public void nextDocsAndScores(int nextCount, Bits liveDocs, DocAndFloatFeatureBu
buffer.docs[size++] = indexIterator.index();
}
}
int loopBound = size - (size % bulkSize);
final int firstBulkSize = Math.min(bulkSize, size);
for (int j = 0; j < firstBulkSize; j++) {
final long ord = buffer.docs[j];
inputSlice.prefetch(ord * byteSize, byteSize);
}
final int loopBound = size - (size % bulkSize);
int i = 0;
for (; i < loopBound; i += bulkSize) {
for (int j = 0; j < bulkSize; j++) {
long ord = buffer.docs[i + j];
final int nextI = i + bulkSize;
final int nextBulkSize = Math.min(bulkSize, size - nextI);
for (int j = 0; j < nextBulkSize; j++) {
final long ord = buffer.docs[nextI + j];
inputSlice.prefetch(ord * byteSize, byteSize);
}
System.arraycopy(buffer.docs, i, docBuffer, 0, bulkSize);
inner.bulkScore(docBuffer, scoreBuffer, bulkSize);
System.arraycopy(scoreBuffer, 0, buffer.features, i, bulkSize);
}
int countLeft = size - i;
for (int j = i; j < size; j++) {
long ord = buffer.docs[j];
inputSlice.prefetch(ord * byteSize, byteSize);
}
final int countLeft = size - i;
System.arraycopy(buffer.docs, i, docBuffer, 0, countLeft);
inner.bulkScore(docBuffer, scoreBuffer, countLeft);
System.arraycopy(scoreBuffer, 0, buffer.features, i, countLeft);
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