This is a utility that makes it easy for existing Lucene code to
use a RAM or memory index instead of a disk-based one.
This utility converts a
Directory
to a
RAMDirectory.
The use case would be:
- Your index fits into RAM
- You are performing expensive searches
Before
String indexName = ...;
searcher = new IndexSearcher( indexName);
After
import com.tropo.lucene.*;
String indexName = ...;
searcher = new IndexSearcher( Rammer.convert( indexName));
Download
Rammer.java
Performance
In some testing of a 2000 document, 4MB index the time
to convert the index to a RAMDirectory was essentially
the same as not converting it (both variations approx 70 ms).
In some experimental code that looks at the frequencies of all
pairs of terms and thus uses an O(N^2) algorithm, run times
were:
- App 1: From 45 to 35 secs using Rammer.convert()
- App 2: From 22 to 18 secs using Rammer.convert()
Thus it reduces time approx 20%.
