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)