Contrived FieldCache Load Test: Lucene 2.4 VS Lucene 2.9

最新推荐文章于 2025-11-23 22:15:59 发布

原创最新推荐文章于 2025-11-23 22:15:59 发布 · 168 阅读

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#lucene #Java #Blog

本文通过一个构造的FieldCache负载测试对比了Lucene 2.4与Lucene 2.9的加载性能。测试中创建了一个包含五百万条文档的索引，并测量了获取字段缓存的时间。

转载：http://www.lucidimagination.com/blog/2009/09/22/contrived-fieldcache-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");
  }
}