线程池代码

@Configuration
public class ThreadPoolConfig
{
    // 核心线程池大小
    private int corePoolSize = 24;

    // 最大可创建的线程数
    private int maxPoolSize = 25;

    // 队列最大长度
    private int queueCapacity = 100;

    // 线程池维护线程所允许的空闲时间
    private int keepAliveSeconds = 300;

    @Bean(name = "stockThreadPool")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor()
    {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(maxPoolSize);
        executor.setCorePoolSize(corePoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        executor.setThreadGroupName("JM");
        executor.setThreadNamePrefix("stock-thread-");
        // 线程池对拒绝任务(无线程可用)的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}

错误设置

压测：5000个文件同时处理，设置100个线程

压测结果：出现很多超时TIMED_WAITING

原因：如果线程数设置太多，会一直开辟新线程，如果GC自动回收来不及，会出现很超时线程，最后会引起OOM

正确设置

压测：5000个文件同时处理，设置10个线程

压测：5000个文件同时处理，设置10个线程
压测结果：线程都正常运行RUNNABLE

线程池设置多少合适

https://blog.csdn.net/weixin_44371237/article/details/132690861