private static final String TMP = System.getProperty("java.io.tmpdir");
public static void main(String[] args) throws IOException {
String basePath = TMP + "/DataStorePerfTest";
ChronicleTools.deleteOnExit(basePath);
IndexedChronicle chronicle = new IndexedChronicle(basePath);
chronicle.useUnsafe(true);
DataStore dataStore = new DataStore(chronicle, ModelMode.MASTER);
MapWrapper<String, byte[]> map = new MapWrapper<String, byte[]>(dataStore, "map",
String.class, byte[].class, new LinkedHashMap<String, byte[]>(), 160);
dataStore.add("map", map);
dataStore.start();
// generate keys and values
int keyCount = 100000;
String[] keys = new String[keyCount];
byte[][] bytes = new byte[keyCount][];
Random rand = new Random();
for (int i = 0; i < keyCount; i++) {
StringBuilder key = new StringBuilder();
do {
key.append(Integer.toString(rand.nextInt() & Integer.MAX_VALUE, 36));
} while (key.length() < 16);
key.setLength(16);
keys[i] = key.toString();
bytes[i] = new byte[100];
}
Collections.sort(Arrays.asList(keys));
for (int t = 0; t < 10; t++) {
map.clear();
long time0 = System.nanoTime();
// Start with sequential writes
for (int i = 0; i < keyCount; i++) {
map.put(keys[i], bytes[i]);
}
long time1 = System.nanoTime();
// Sequential reads
for (int i = 0; i < keyCount; i++) {
byte[] bytes0 = map.get(keys[i]);
}
long time2 = System.nanoTime();
String[] keys2 = keys.clone();
Collections.shuffle(Arrays.asList(keys2));
long time3 = System.nanoTime();
// random writes
for (int i = 0; i < keyCount; i++) {
map.put(keys[i], bytes[i]);
}
long time4 = System.nanoTime();
// random reads
for (int i = 0; i < keyCount; i++) {
byte[] bytes0 = map.get(keys[i]);
}
long time5 = System.nanoTime();
System.out.printf("Seq write: %,d K/s, Seq read: %,d K/s, Rnd write: %,d K/s, Rnd read: %,d K/s%n",
keyCount * 1000000L / (time1 - time0),
keyCount * 1000000L / (time2 - time1),
keyCount * 1000000L / (time4 - time3),
keyCount * 1000000L / (time5 - time4)
);
}
chronicle.close();
}