Operating System
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操作系统并发
Terms Critical section: piece of code that accesses a shared resource. Race condition: 多个线…
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CPU Scheduling Policies 调度算法
本文只写给自己,所以比较粗糙。 调度衡量指标 Turnaround time Turnaround time = 任务完成时间-任务到达时间$$T_{turnaround} = T…
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Log-Structured File System
Introduction Log-Structured File System (LFS)发明的背景就是建立在 CPU 高速发展,磁盘读取写入速度极速发展,单位内存越来越便宜,而磁…
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Fast File System
Fast File System(FFS)一个具有里程碑意义的文件系统。它没有修改上层调用的 API,例如( open(), read(), write() 等等),而修改了内部实…