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static int threadNum = 100;

只有5个线程活跃，其他线程OOM后退出

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另一种情况：其他线程短暂休眠（0.5s左右）之后退出只有5个线程活跃，其他线程休眠，未爆OOM

原因解释：申请内存失败时会短暂等待，等待的最长时间是0.5s左右

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5、线程池，从文件随机读取一段

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