@Test
public void testSimplePerformance() {

table memtable = new Memtable();
e file = new File("file");
pWatch stopWatch = new StopWatch();
pWatch.start();
 (int i = 0; i < 10000; ++i) {
 memtable.put(new IndexEntry(Key.of((long) i), file, i));
pWatch.stop();
tem.out.println(stopWatch);
ertTrue(stopWatch.getDuration().compareTo(Duration.ofSeconds(1, 100)) < 0);
}