Introduction Introduction to OpenMP (Originally for CS 838, Wisconsin-Madison) Shuaiwen Leon Song Slides are derived from online references of National Laboratory, National Energy Research Scientific Computing Center, University of Minnesota, OpenMP.org * (C) 2006 * Introduction to OpenMP What is OpenMP? Open specification for Multi-Processing “Standard” API for defining multi-threaded shared-memory programs openmp.org – Talks, […]
7/21/21 What is an abstraction? A Physical Machine 0000 0000 0001 0000 0010 0000 Machine Instructions (defun fun (L) (mapcar #’1+ L)) A Programming Language An abstraction A Physical Machine 1 0000 0000 0001 0000 0010 0000 A Physical Machine Machine Instructions LISP car cdr defun map What is an abstraction? 12 34 A Physical
Operating Systems – CSCI 402 Simple I/O Architecture Bus Controller Controller Controller Controller Memory memory-mapped I/O Disk all controllers listen on the bus to determine if a request is for itself or not memory controller behaves differently from other controllers, i.e., it passes the bus request to primary memory others “process” the bus request and
IT代写 Operating Systems – CSCI 402 Read More »
a file object represents an opened file a file descriptor is simply an index to this array Whenever a process requests a new file descriptor, the lowest numbered file descriptor not already associated with an open file is selected; thus #include #include … close(0); fd = open(“file”, O_RDONLY); the above will always associate “file” with
IT代写 a file object represents an opened file Read More »
for kernel assignments “timely” means within 8 hours or the original post No individual extra credit try your best from the beginning! 321 0 Operating Systems – CSCI 402 Projects Midterm Final Grading 45% 2 warm-ups (individual), 3 group projects 25% during class time, Wed, 10/27/2021 (firm) 30% (DEN section) 8am-10am, Mon, 12/13/2021 (firm) (PM
CS代考 for kernel assignments Read More »
Operating Systems – CSCI 402 5.1.1.3 Scheduler Activations Model 40 321 0 Copyright ý . Systems – CSCI 402 Problems With Two-level Model Two-level model does not solve the I/O blocking problem if there are N kernel threads and if N user threads are blocked in I/O no other user threads can make progress Solaris
CS代考 Operating Systems – CSCI 402 Read More »
More Concurrency Exercises and OpenMP Shuaiwen Concurrency and Synchronization Exercise 2 How many lines of output will it produce? Answer: 7 Q1(fork) 3 Q2 (sempahores) Consider the following program using semaphores . Which of the following execution order of sem_wait and sem_post are possible (W represent sem_wait, P represent sem_post)? (A) WPWWWP (B) WWPPWW (C)
CS代考 More Concurrency Exercises and OpenMP Read More »
Operating Systems – CSCI 402 Signals and Blocking System Calls What if a signal is generated while a process is blocked in a system call? 1) deal with it when the system call completes 2) interrupt the system call, deal with signal, resume system call 3) interrupt system call, deal with signal, return from system
程序代写 Operating Systems – CSCI 402 Read More »
C Crash Course (I): C Basics for System Programming Presented by Dr. Shuaiwen Leon Song USYD Future System Architecture Lab (FSA) https://shuaiwen-leon-song.github.io/ COMMONWEALTH OF AUSTRALIA Copyright Regulations 1969 WARNING This material has been reproduced and communicated to you by or on behalf of the University of Sydney pursuant to Part VB of the Copyright Act
CS代考 C Crash Course (I): C Basics for System Programming Read More »
8/25/21 Key topics discussed so far Lecture 1: General ideas about PLs Abstraction: Examples? Empowerment: Examples? PLs need to be compiled: Why? There are many PLs: Why? Lecture 2: Computability – TM and l-calculus We are not interested in what are computable functions and what are not. Instead, we ask: Can we guarantee that all