摘要：
Segmentation 1. Segmentation: Generalized Base/Bounds 我们可以看一下（Figure 16.1），尽管每个CPU都有一对硬件寄存器（base register和bounds register），但是还是不可避免的会产生内存浪费（阴影部分表示未被使用 阅读全文
posted @ 2022-10-14 19:04
astralcon
阅读(187)
评论(0)
推荐(0)
摘要：
Mechanism: Address Translation In developing the virtualization of the CPU, we focused on a general mechanism known as limited direct execution (or LD 阅读全文
posted @ 2022-10-14 19:03
astralcon
阅读(174)
评论(0)
推荐(0)
摘要：
Interlude: Memory API 1. Types of Memory 对于一个即将运行的C程序，有两种分配内存的方式。 第一种为stack memory，也叫做automatic memory。 当你调用 func()， 编译器做剩下的工作，确保在stack上给变量x分配内存地址。 vo 阅读全文
posted @ 2022-10-14 19:03
astralcon
阅读(47)
评论(0)
推荐(0)
摘要：
The Abstraction: Address Spaces 1. Early Systems 在早期系统时代，操作系统和程序都存储在实际的物理地址中。 2. Multiprogramming and Time Sharing 为了提高efficiency，人们尝试用一台机器处理多个程序，进而引入 阅读全文
posted @ 2022-10-14 19:02
astralcon
阅读(35)
评论(0)
推荐(0)
摘要：
Homework (Simulation) In this homework, we’ll use multi.py to simulate a multi-processor CPU scheduler, and learn about some of its details. Read the 阅读全文
posted @ 2022-10-14 19:02
astralcon
阅读(102)
评论(0)
推荐(0)
摘要：
Lottery Scheduling 0. Basic Concept A : 75 tickets (0~74) B：25 tickets (75~99) A1 + A2：1000 tickets B1：10 tickets 注意：要区分一个进程和一个线程的tickets。 如下所示，A和B分别有 阅读全文
posted @ 2022-10-14 19:00
astralcon
阅读(82)
评论(0)
推荐(0)
摘要：
0. 文件地址 Homework 1. MLFQ: Basic Rules 2. Attempt #1: How To Change Priority 2.1 Example 1: A Single Long-Running Job 2.2 Example 2: Along Came A Short 阅读全文
posted @ 2022-10-14 19:00
astralcon
阅读(58)
评论(0)
推荐(0)
摘要：
0. 文件地址 Homework 1. Workload Assumptions 2. Scheduling Metrics 3. First In, First Out (FIFO) 4. Shortest Job First (SJF) 5. Shortest Time-to-Completio 阅读全文
posted @ 2022-10-14 18:59
astralcon
阅读(97)
评论(0)
推荐(0)
摘要：
Homework (Simulation) This program, process-run.py, allows you to see how process states change as programs run and either use the CPU (e.g., perform 阅读全文
posted @ 2022-10-14 18:58
astralcon
阅读(267)
评论(0)
推荐(0)
摘要：
0. installing and using of Cygmin Since Cygwin was installed at the request of the teacher when taking the basic computer class, I will not introduce 阅读全文
posted @ 2022-10-14 18:58
astralcon
阅读(92)
评论(0)
推荐(0)
浙公网安备 33010602011771号