这个操作系统是对硬件进行了抽象的应用程序执行环境。
An operating system is application execution environment that abstracts away the hardware.
还是在本地环境，在多个执行器机器上用大量的任务测试应用程序。
Test the application with a larger number of tasks using multiple worker machines, still local.
还是在本地环境，在多个执行器机器上用大量的任务测试应用程序。
Test the application with a larger number of tasks using multiple worker machines, still local.
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