71 lines
1.6 KiB
Java
71 lines
1.6 KiB
Java
|
// understandingcollections/jmh/Deques.java
|
||
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
||
|
|
// We make no guarantees that this code is fit for any purpose.
|
||
|
|
// Visit http://OnJava8.com for more book information.
|
||
|
|
// Performance differences between Deques
|
||
|
|
package understandingcollections.jmh;
|
||
|
|
import org.openjdk.jmh.annotations.*;
|
||
|
|
import org.openjdk.jmh.infra.Blackhole;
|
||
|
|
import java.util.concurrent.TimeUnit;
|
||
|
|
import java.util.*;
|
||
|
|
|
||
|
|
@State(Scope.Thread)
|
||
|
|
@OutputTimeUnit(TimeUnit.MICROSECONDS)
|
||
|
|
@Warmup(iterations = 5, batchSize = 5000)
|
||
|
|
@Measurement(iterations = 5, batchSize = 5000)
|
||
|
|
@BenchmarkMode(Mode.SingleShotTime)
|
||
|
|
@Fork(1)
|
||
|
|
public class Deques {
|
||
|
|
private Deque<String> deque;
|
||
|
|
|
||
|
|
@Param({
|
||
|
|
"java.util.LinkedList",
|
||
|
|
"java.util.ArrayDeque",
|
||
|
|
"java.util.concurrent.ConcurrentLinkedDeque",
|
||
|
|
"java.util.concurrent.LinkedBlockingDeque",
|
||
|
|
})
|
||
|
|
private String type;
|
||
|
|
|
||
|
|
@Param({
|
||
|
|
"1",
|
||
|
|
"10",
|
||
|
|
"100",
|
||
|
|
"1000",
|
||
|
|
"10000",
|
||
|
|
"100000"
|
||
|
|
})
|
||
|
|
private int size;
|
||
|
|
|
||
|
|
@Setup
|
||
|
|
public void setup() {
|
||
|
|
try {
|
||
|
|
deque = (Deque<String>)
|
||
|
|
Class.forName(type).newInstance();
|
||
|
|
} catch(Exception e) {
|
||
|
|
System.err.println(
|
||
|
|
"-> Cannot create: " + type);
|
||
|
|
System.exit(99);
|
||
|
|
}
|
||
|
|
for(int i = 0; i < size; i++)
|
||
|
|
deque.add(Integer.toString(i));
|
||
|
|
}
|
||
|
|
@Benchmark
|
||
|
|
public Deque<String> addFirst() {
|
||
|
|
deque.addFirst("test");
|
||
|
|
return deque;
|
||
|
|
}
|
||
|
|
@Benchmark
|
||
|
|
public Deque<String> addLast() {
|
||
|
|
deque.addLast("test");
|
||
|
|
return deque;
|
||
|
|
}
|
||
|
|
@Benchmark
|
||
|
|
public void pollFirst(Blackhole bh) {
|
||
|
|
bh.consume(deque.pollFirst());
|
||
|
|
}
|
||
|
|
@Benchmark
|
||
|
|
public void pollLast(Blackhole bh) {
|
||
|
|
bh.consume(deque.pollLast());
|
||
|
|
}
|
||
|
|
}
|