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linux进程优先级分为两类:
静态优先级: 存于task_struct->static_prio即nice,默认为0,一旦被指定除非renice手工修改,否则不会自行调整;其决定了进程时间片的大小;
动态优先级: task_struct->prio,由调度程序使用,其以nice值为基础,进行(-5,+5)浮动; 调度程序通过进程休眠时间(task_struct->sleep_avg)判断其交互性,若大部分时间都在休眠则为IO消耗型,否则为CPU消耗型;
注:这是参照Robert Love所著的linux kernel整理的笔记
In linux , total 140 priorities are available. In which , 0 - 99 are real time priorities and 100 to 139 are regular priorities. So it means for user only 100 to 139 are available but user can change this to real time priorities by using this command
对此一直有几个疑问
1 top命令显示的pr = 静态优先级 + 动态优先级么?
2 top命令显示普通进程的pr为何都是小于100?
3 top和ps显示的pri是采用相同方式计算的吗? |
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