Operating Systems – CSCI 402 Ch 1: Introduction Bill Cheng http://merlot.usc.edu/william/usc/ 1 321 0 Copyright ý . Systems – CSCI 402 What are Operating Systems? Possible definitions: the code that {Microsoft, Apple, Linus, Google} provides the code that you didn¡¯t write the code that runs in privileged mode the code that makes things work the […]
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Concurrency for Software Development Presented by Dr. Shuaiwen Leon Song USYD Future System Architecture Lab (FSA) https://shuaiwen-leon-song.github.io/ Tips for students joining online – Remember that you are still in a space with other students. – Mute your microphone when not speaking. – Use earphones or headphones – the mic is better and you’ll disturb others
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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,
SOFT3410 Tutorial 0 Exercises These are a set of problems to get started with before your first lab. Feel free to discuss these problems on Ed. Question 1: Hello From C WriteaHello, World!programinCthatoutputsthefollowing. int main() { puts(“Hello, World!”); } Question 2: Reverse Array Write a function that reverses an integer array, I would encourage you
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Operating Systems – CSCI 402 Ch 5: Processor Management http://merlot.usc.edu/william/usc/ 30 321 0 Copyright ý . Systems – CSCI 402 Processor Management Threads Implementation lock/mutex implementation on multiprocessors Interrupts Scheduling Linux/Windows Scheduler 31 321 0 Copyright ý . Simple Thread Implementation Multiple Processors Operating Systems – CSCI 402 Strategies 5.1 Threads Implementations 32 321 0
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System Calls A trap is a type of “software interrupt” interrupt handler will invoke trap handler prog( ) { … write(fd, buffer, size); … }} User Kernel intr_handler(intr_code) { … if (intr_code == SYSCALL) syscall_handler( ); … } syscall_handler(trap_code) { … if (trap_code == write_code) write_handler( ); … } trap(write_code); … User Stack Operating Systems
SOFT3410 Tutorial 5 Threads The goal of this lab is to act as an introduction to threads and encounter some parallel problems Question 1: Welcome to threads Up until now, most of your programs have involved only a single thread. Within this lab we will explore initialising threads and writing separate thread functions. Given the
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SOFT3410 Tutorial 9 OpenMP Introduction to OpenMP and how it can be used to transform the performance of our applications Question 1: Hello OpenMP Ensure that you have the OpenMP libraries installed on your system. You can check this by construct- ing the following OpenMP HelloWorld program. #include #include int main(void) { #pragma omp parallel
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SOFT3410 Tutorial 8 Synchronisation 2 We will be looking into more synchronisation primitives and patterns in this tutorial Question 1: Memory Fencing Using the following source code, observe the effects of compiling your application using -O0 and -O2. Do you observe any errors in the behaviour with the application when executing it? Attempt to send
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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
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