public class TestBlockingThread {
private static final Logger LOGGER = LoggerFactory.getLogger(TestBlockingThread.class);
public static final void main(String[] args) throws InterruptedException {
Runnable task = () -> {
int i = 0;
while (true) {
i++;
if (i != 0) {
boolean b = 1 % i == 0;
}
}
};
new Thread(new LogTimer()).start();
Thread.sleep(2000);
new Thread(task).start();
}
public static class LogTimer implements Runnable {
@Override
public void run() {
while (true) {
long start = System.currentTimeMillis();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// do nothing
}
LOGGER.info("timeElapsed={}", System.currentTimeMillis() - start);
}
}
}
}
这将得到以下结果:
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1004
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1003
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=13331
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1006
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1003
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1004
[Thread-0] INFO c.m.c.concurrent.TestBlockingThread - timeElapsed=1004
我不明白为什么这个无限任务会阻塞其他线程长达13.3秒。我尝试过改变线程优先级和其他设置,但都没有效果。
如果您有任何建议来解决这个问题(包括调整操作系统上下文切换设置),请告诉我。
-XX:+PrintCompilation
运行后,当延迟结束时,我获得了以下输出:TestBlockingThread::lambda$0 @ 2 (24字节) 编译已跳过:平凡的无限循环(在不同层重新尝试)。 - Andreas