jpountz edited a comment on pull request #184:
URL: https://github.com/apache/lucene/pull/184#issuecomment-861287012
On this simple test, memory usage for a single doc in the DWPT goes from
9.6MB to 1.4MB.
```java
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.IntPoint;
import org.apache.lucene.document.SortedNumericDocValuesField;
import org.apache.lucene.document.SortedSetDocValuesField;
import org.apache.lucene.document.StoredField;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.util.BytesRef;
public class IWBuffer {
public static void main(String[] args) throws Exception {
try (ByteBuffersDirectory dir = new ByteBuffersDirectory();
IndexWriter w = new IndexWriter(dir, new
IndexWriterConfig().setRAMBufferSizeMB(1000))) {
Document doc = new Document();
for (int i = 0; i < 100; ++i) {
String keywordFieldName = "keyword" + i;
doc.add(new StringField(keywordFieldName, "Lucene", Store.YES));
doc.add(new SortedSetDocValuesField(keywordFieldName, new
BytesRef("Lucene")));
String numericFieldName = "numeric" + i;
doc.add(new IntPoint(numericFieldName, 4));
doc.add(new SortedNumericDocValuesField(numericFieldName, 4));
doc.add(new StoredField(numericFieldName, 4));
}
w.addDocument(doc);
System.out.println(w.ramBytesUsed() / 1024. / 1024.);
}
}
}
```
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