Load Test: Lucene 2.4 VS Lucene 2.9

public class ContrivedFCTest extends TestCase {
public void testLoadTime() throws Exception {
Directory dir = FSDirectory.getDirectory(System.getProperty("java.io.tmpdir") + File.separator + "test");
IndexWriter writer = new IndexWriter (dir, new SimpleAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
writer.setMergeFactor(37);
writer.setUseCompoundFile(false);
for(int i = 0; i < 5000000; i++) {
Document doc = new Document();
doc.add (new Field ("field", "String" + i, Field.Store.NO, Field.Index.NOT_ANALYZED));
writer.addDocument(doc);
}
writer.close();

IndexReader reader = IndexReader.open(dir);
long start = System.currentTimeMillis();
FieldCache.DEFAULT.getStrings(reader, "field");
long end = System.currentTimeMillis();
System.out.println("load time:" + (end - start)/1000.0f + "s");
}
}