Test the performance of SynchronousQueue, LinkedBlockingQueue, and ArrayBlockingQueue.

I heard that JDK6 has optimized the performance of SynchronousQueue to avoid locking competitive resources. So I want to try whether to choose SynchronousQueue or other BlockingQueue at ordinary times.

For the comparison of the container class in the concurrent environment, the first is whether the thread is secure, and the second is how the concurrency performance is. The implementation of BlockingQueue is thread-safe, so it can only compare with their concurrency performance. In different application scenarios, the usage of containers is different. Some read operations have fewer modification and write operations, while others have more modification and write operations, which may affect the performance of containers. However, for the use of Queue, I personally think it is relatively consistent. The simple point is put and get, and the content of an element will not be modified and then read, and few read operations are performed, is there any best practice?

The code is long. I will put it later and draw a conclusion first. Unexpectedly, the performance of javasblockingqueue is far higher than that of ArrayBlcokingQueue, regardless of the number of threads or the length of the Queue, which is better than that of ArrayBlockingQueue. SynchronousQueue is stable, and SynchronousQueue has the best performance regardless of the length of the Queue in 20 threads. In fact, SynchronousQueue has nothing to do with the length of the Queue. If the capacity of the Queue is only 1, so there is no doubt that SynchronousQueue is selected. This is also the purpose of designing SynchronousQueue. However, we can also see that when there are more than 1000 threads, The SynchronousQueue performance will go down, only about half of the peak, and when the Queue is greater than 30, the LinkedBlockingQueue performance will exceed SynchronousQueue.

Conclusion:

• More threads> 20), length of the Queue> 30), use the LinkedBlockingQueue

• Less threads (<20), shorter Queue length (<30), use SynchronousQueue

Of course, when using SynchronousQueue, do not forget the application extension. If you need to extend it in the future, choose LinkedBlockingQueue. Try to restrict SynchronousQueue to special scenarios.

• Using ArrayBlcokingQueue less does not seem to find its advantages. Give suggestions to experts!

Finally, let's take a look at the test code and results: Win7 64bit + JDK7 + CPU4 + 4 GB)

import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.BlockingQueue;import java.util.concurrent.Callable;import java.util.concurrent.CompletionService;import java.util.concurrent.ExecutorCompletionService;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.LinkedBlockingQueue;import java.util.concurrent.SynchronousQueue;public class TestSynchronousQueue {    private static int THREAD_NUM;    private static int N = 1000000;    private static ExecutorService executor;    public static void main(String[] args) throws Exception {                            System.out.println("Producer\tConsumer\tcapacity \t LinkedBlockingQueue \t ArrayBlockingQueue \t SynchronousQueue");                                   for(int j = 0; j<10; j++){            THREAD_NUM = (int) Math.pow(2, j);            executor = Executors.newFixedThreadPool(THREAD_NUM * 2);                                           for (int i = 0; i < 10; i++) {                int length = (i == 0) ? 1 : i * 10;                System.out.print(THREAD_NUM + "\t\t");                System.out.print(THREAD_NUM + "\t\t");                System.out.print(length + "\t\t");                System.out.print(doTest2(new LinkedBlockingQueue<Integer>(length), N) + "/s\t\t\t");                System.out.print(doTest2(new ArrayBlockingQueue<Integer>(length), N) + "/s\t\t\t");                System.out.print(doTest2(new SynchronousQueue<Integer>(), N) + "/s");                System.out.println();            }                                           executor.shutdown();        }    }                           private static class Producer implements Runnable{        int n;        BlockingQueue<Integer> q;                                   public Producer(int initN, BlockingQueue<Integer> initQ){            n = initN;            q = initQ;        }                                   public void run() {            for (int i = 0; i < n; i++)                try {                    q.put(i);                } catch (InterruptedException ex) {                }        }    }                           private static class Consumer implements Callable<Long>{        int n;        BlockingQueue<Integer> q;                                   public Consumer(int initN, BlockingQueue<Integer> initQ){            n = initN;            q = initQ;        }                                   public Long call() {            long sum = 0;            for (int i = 0; i < n; i++)                try {                    sum += q.take();                } catch (InterruptedException ex) {                }            return sum;        }    }                           private static long doTest2(final BlockingQueue<Integer> q, final int n)            throws Exception {        CompletionService<Long> completionServ = new ExecutorCompletionService<Long>(executor);                                   long t = System.nanoTime();        for(int i=0; i<THREAD_NUM; i++){            executor.submit(new Producer(n/THREAD_NUM, q));        }            for(int i=0; i<THREAD_NUM; i++){            completionServ.submit(new Consumer(n/THREAD_NUM, q));        }                                   for(int i=0; i<THREAD_NUM; i++){            completionServ.take().get();        }                                       t = System.nanoTime() - t;        return (long) (1000000000.0 * N / t); // Throughput, items/sec    }}

Program running result:

Producer    Consumer    capacity     LinkedBlockingQueue     ArrayBlockingQueue      SynchronousQueue1       1       1       154567/s            154100/s            3655071/s1       1       10      1833165/s           1967491/s           3622405/s1       1       20      3011779/s           2558451/s           3744037/s1       1       30      3145926/s           2632099/s           3354525/s1       1       40      3289673/s           2879696/s           3581858/s1       1       50      3201828/s           3008838/s           3600100/s1       1       60      3171374/s           2541672/s           3922617/s1       1       70      3159786/s           2844493/s           3423066/s1       1       80      3042835/s           2536290/s           3443517/s1       1       90      3025808/s           3026241/s           3307096/s2       2       1       141555/s            135653/s            2897927/s2       2       10      1627066/s           785082/s            2908671/s2       2       20      2199668/s           1604847/s           2937085/s2       2       30      2309495/s           2115986/s           2922671/s2       2       40      2335737/s           2424491/s           2942621/s2       2       50      2394045/s           2405210/s           2918222/s2       2       60      2499445/s           2471052/s           2881591/s2       2       70      2368143/s           2454153/s           2914038/s2       2       80      2381024/s           2457910/s           2937337/s2       2       90      2509167/s           2461035/s           2789278/s4       4       1       138177/s            138101/s            2736238/s4       4       10      1654165/s           478171/s            2693045/s4       4       20      2443373/s           779452/s            2728493/s4       4       30      2646300/s           1169313/s           2787315/s4       4       40      2755774/s           1487883/s           2874789/s4       4       50      2774736/s           1579152/s           2804046/s4       4       60      2804725/s           1998602/s           2803680/s4       4       70      2797524/s           2388276/s           2936613/s4       4       80      2887786/s           2557358/s           2899823/s4       4       90      2878895/s           2539458/s           2839990/s8       8       1       140745/s            135621/s            2711703/s8       8       10      1650143/s           526018/s            2730710/s8       8       20      2477902/s           798799/s            2696374/s8       8       30      2658511/s           983456/s            2783054/s8       8       40      2694167/s           1185732/s           2677500/s8       8       50      2758267/s           1110716/s           2766695/s8       8       60      2831922/s           1003692/s           2762232/s8       8       70      2763751/s           1409142/s           2791901/s8       8       80      2771897/s           1654843/s           2838479/s8       8       90      2740467/s           1718642/s           2806164/s16      16      1       131843/s            137943/s            2694036/s16      16      10      1637213/s           491171/s            2725893/s16      16      20      2523193/s           660559/s            2709892/s16      16      30      2601176/s           899163/s            2689270/s16      16      40      2794088/s           1054763/s           2759321/s16      16      50      2777807/s           1111479/s           2663346/s16      16      60      2893566/s           931713/s            2778294/s16      16      70      2822779/s           1286067/s           2704785/s16      16      80      2828238/s           1430581/s           2724927/s16      16      90      2860943/s           1249650/s           2791520/s32      32      1       132098/s            130805/s            2676121/s32      32      10      1586372/s           402270/s            2674953/s32      32      20      2467754/s           886059/s            2580989/s32      32      30      2569709/s           772173/s            2599466/s32      32      40      2659883/s           963633/s            2677042/s32      32      50      2721213/s           910607/s            2677578/s32      32      60      2779272/s           861786/s            2676874/s32      32      70      2757921/s           1111937/s           2696416/s32      32      80      2915294/s           1323776/s           2655641/s32      32      90      2798313/s           1193225/s           2630231/s64      64      1       126035/s            123764/s            2526632/s64      64      10      1539034/s           394597/s            2582590/s64      64      20      2449850/s           703790/s            2598631/s64      64      30      2672792/s           758256/s            2529693/s64      64      40      2797081/s           661028/s            2573380/s64      64      50      2789848/s           1162143/s           2659469/s64      64      60      2726806/s           1145495/s           2567020/s64      64      70      2731554/s           1359939/s           2607615/s64      64      80      2871116/s           1305428/s           2494839/s64      64      90      2774416/s           1339611/s           2560153/s128     128     1       223305/s            112828/s            2390234/s128     128     10      1419592/s           404611/s            2401086/s128     128     20      2365301/s           793815/s            2516045/s128     128     30      2647136/s           915702/s            2463175/s128     128     40      2721664/s           1081728/s           2400299/s128     128     50      2688304/s           1149251/s           2489667/s128     128     60      2774212/s           1145298/s           2453444/s128     128     70      2782905/s           1165408/s           2403510/s128     128     80      2818388/s           1392486/s           2389275/s128     128     90      2738468/s           1546247/s           2425994/s256     256     1       160146/s            80530/s         2369297/s256     256     10      1214041/s           364460/s            2142039/s256     256     20      1915432/s           901668/s            2156774/s256     256     30      2371862/s           1124997/s           2237464/s256     256     40      2630812/s           1123016/s           2216475/s256     256     50      2666827/s           1239640/s           2267322/s256     256     60      2635269/s           1276851/s           2318122/s256     256     70      2663477/s           1333002/s           2188256/s256     256     80      2672080/s           1659850/s           2315438/s256     256     90      2804828/s           1497635/s           2194905/s512     512     1       123294/s            68426/s         1892168/s512     512     10      1028250/s           296454/s            1728199/s512     512     20      1545215/s           604512/s            1963526/s512     512     30      1968728/s           762240/s            2000386/s512     512     40      2273678/s           854483/s            1948188/s512     512     50      2295335/s           939350/s            1858429/s512     512     60      2419257/s           1056918/s           1884224/s512     512     70      2346088/s           980795/s            1852387/s512     512     80      2341964/s           928496/s            1867498/s512     512     90      2375789/s           1290064/s           1923461/s

This article is from "the power comes from the sincere love !" Blog, please be sure to keep this source http://stevex.blog.51cto.com/4300375/1287085