A simple test of performance for ConcurrentHashMap.
The insert is only a little slower, but the retrieval is 3x slower in this quick and dirty single-threaded test.
TimeUtil timer = new TimeUtil();
timer.start();
HashMap map = new HashMap();
for (int i = 0; i < 1000000; i++) {
map.put(i, i);
}
timer.printCurrent();
timer.start();
ConcurrentHashMap cmap = new ConcurrentHashMap();
for (int i = 0; i < 1000000; i++) {
cmap.put(i, i);
}
timer.printCurrent();
timer = new TimeUtil();
timer.start();
map = new HashMap();
for (int i = 0; i < 1000000; i++) {
map.get(i);
}
timer.printCurrent();
timer.start();
cmap = new ConcurrentHashMap();
for (int i = 0; i < 1000000; i++) {
cmap.get(i);
}
timer.printCurrent();
Action completed in: 458 ms 0.458 seconds
Action completed in: 574 ms 0.574 seconds
Action completed in: 30 ms 0.03 seconds
Action completed in: 113 ms 0.113 seconds
Filed under: Code, Performance
