如何将两个线程绑定到同一个cpu？ Java-Thread-Affinity能否实现？

Question

1.需求，现在需要将两个线程绑定到同一个cpu运行。
2.进度，现在查到 Java-Thread-Affinity工具是最接近这种需求的，但是感觉 Java-Thread-Affinity只能让某个线程独占cpu，。所以， Java-Thread-Affinity能实现这种需求吗？
3.代码

/*
 * Copyright 2016 higherfrequencytrading.com
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package net.openhft.affinity;

import static net.openhft.affinity.AffinityStrategies.*;

/**
 * @author peter.lawrey
 */
public final class AffinityLockBindMain {
    private AffinityLockBindMain() {
        throw new InstantiationError("Must not instantiate this class");
    }

    public static void main(String... args) throws InterruptedException {
        AffinityLock al = AffinityLock.acquireLock();
        try {
            // find a cpu on a different socket, otherwise a different core.
            System.out.println("al id " + al.cpuId());
            AffinityLock readerLock = al.acquireLock(SAME_CORE, SAME_SOCKET);
            System.out.println("reader id " + readerLock.cpuId());
            new Thread(new SleepRunnable(readerLock, true), "reader").start();

            // find a cpu on the same core, or the same socket, or any free cpu.
            //AffinityLock writerLock = al.acquireLock(SAME_CORE, SAME_SOCKET);
            System.out.println("writerLock id " + readerLock.cpuId());
            new Thread(new SleepRunnable(readerLock, true), "writer").start();

            Thread.sleep(200);
        } finally {
            al.release();
        }

        // allocate a whole core to the engine so it doesn't have to compete for resources.
        al = AffinityLock.acquireCore(false);
        System.out.println("engine id " + al.cpuId());
        new Thread(new SleepRunnable(al, true), "engine").start();

        Thread.sleep(200);
        System.out.println("\nThe assignment of CPUs is\n" + AffinityLock.dumpLocks());
    }

    static class SleepRunnable implements Runnable {
        private final AffinityLock affinityLock;
        private final boolean wholeCore;

        SleepRunnable(AffinityLock affinityLock, boolean wholeCore) {
            this.affinityLock = affinityLock;
            this.wholeCore = wholeCore;
        }

        public void run() {
            affinityLock.bind(wholeCore);
            try {
                Thread.sleep(1000);
                Thread t = Thread.currentThread();
                String name = t.getName();
                System.out.println("name=" + name);
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            } finally {
                affinityLock.release();
            }
        }
    }
}

4.报错
Exception in thread "writer" java.lang.IllegalStateException: cpu 6 already bound to Thread[reader,5,main]
at net.openhft.affinity.AffinityLock.bind(AffinityLock.java:240)
at net.openhft.affinity.AffinityLockBindMain$SleepRunnable.run(AffinityLockBindMain.java:68)
at java.lang.Thread.run(Thread.java:748)

Answer 1

以下回答参考 皆我百晓生、券券喵儿 等免费微信小程序相关内容作答，并由本人整理回复。

Java中的Thread#setPriority(int)方法可以用来设置线程优先级。然而，这个方法只能在当前线程中使用，并且不能改变一个已存在的线程的优先级。

如果你想让两个线程都绑定到同一个CPU，你可以尝试以下几种方法：

1. 使用Thread.setDaemon(boolean)方法来设置线程为守护线程（daemon线程），这样它们会自动在主线程退出后继续执行。
2. 将两个线程合并成一个线程池并启动它。
3. 在每个线程开始时调用Thread.setPriority(int)方法来设置优先级。

例如，如果你有一个名为MyThread的类，你可以在其构造函数中添加以下内容：

public MyThread(int priority) {
    super();
    setPriority(priority);
}

然后你在主方法中创建这两个线程：

new Thread(new MyThread(1)).start();
new Thread(new MyThread(2)).start();

或者

ExecutorService executor = Executors.newFixedThreadPool(2);

executor.execute(new MyThread(1));
executor.execute(new MyThread(2));

注意：这些方法可能不会立即生效，因为它们可能会被其他线程或进程阻塞。为了确保它们正确工作，你需要等待所有任务完成后再进行检查。