package com.bigdata.btree;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import com.bigdata.btree.IndexSegment.ImmutableLeafCursor;
import com.bigdata.btree.IndexSegment.ImmutableNodeFactory.ImmutableLeaf;
public class IndexSegmentDumpUtil {
/**
* @param args
*/
public static void main(String[] args) {
try {
if (args.length != 1) {
printUsage();
return;
}
File file = new File(args[0]);
// File file = new File("D:\\temp\\segs\\U100000_spo_SPO_part00139_51095.seg");
IndexSegmentStore store = new IndexSegmentStore(file);
System.err.println("checkpoint: "+store.getCheckpoint());
IndexSegment ndxSegment = store.loadIndexSegment();
// wait for enter
long before = Runtime.getRuntime().freeMemory();
System.err.println("free memory before loading first leaf: " + before);
System.err.println("take your memory dump and then press enter to load the first leaf");
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String input = reader.readLine();
ImmutableLeafCursor cursor = ndxSegment.newLeafCursor(SeekEnum.First);
ImmutableLeaf leaf = cursor.first();
long after = Runtime.getRuntime().freeMemory();
long used = before - after;
System.err.println("free memory after loading first leaf: " + after);
System.err.println("free memory used loading first leaf: " + used);
// byte counts on disk
System.err.println("bytes on disk for root: " + store.getByteCount(store.getCheckpoint().addrRoot));
System.err.println("bytes on disk for first leaf: " + store.getByteCount(store.getCheckpoint().addrFirstLeaf));
System.err.println("take your memory dump and then press enter to end the program");
input = reader.readLine();
// hit enter
// compare free memory before and after loading leaf
// measuer of inflation in memory
// exclude weak references, leaves and nodes have weak refs to segment
// total retained memory for node and leaf
} catch (Exception ex) {
ex.printStackTrace();
}
}
private static void printUsage() {
System.err.println("You must specify an index segment store file");
}
}