PPT - Course Website Directory
... User app main program; calls kernel for services OS main program; calls user programs as subroutines ...
... User app main program; calls kernel for services OS main program; calls user programs as subroutines ...
Slides
... bytes/records read in any order essential for data base systems read can be … move file marker (seek), then read or … read and then move file marker ...
... bytes/records read in any order essential for data base systems read can be … move file marker (seek), then read or … read and then move file marker ...
HDD for Operating System Concepts
... Education and Research Department, Infosys Technologies Limited. This document is not for general distribution and is meant for use only for the person they are specifically issued to. This document shall not be loaned to anyone, within or outside Infosys, including its customers. Copying or unautho ...
... Education and Research Department, Infosys Technologies Limited. This document is not for general distribution and is meant for use only for the person they are specifically issued to. This document shall not be loaned to anyone, within or outside Infosys, including its customers. Copying or unautho ...
The Sprite Network Operating System
... Almost all modern network file systems, including Sprite’s, have the same ultimate goal: network transparency. Network transparency means that users should be able to manipulate files in the same ways they did under time-sharing on a single machine; the distridbuted nature of the file system and the ...
... Almost all modern network file systems, including Sprite’s, have the same ultimate goal: network transparency. Network transparency means that users should be able to manipulate files in the same ways they did under time-sharing on a single machine; the distridbuted nature of the file system and the ...
Syllabus - Regis University: Academic Web Server for Faculty
... An operating system (OS) is a set of programs on a computer that provide services to the user and to user processes, and acts as the interface between the hardware and the user. CS431 examines how operating systems work in general, rather than concentrating on a specific operating system or coding a ...
... An operating system (OS) is a set of programs on a computer that provide services to the user and to user processes, and acts as the interface between the hardware and the user. CS431 examines how operating systems work in general, rather than concentrating on a specific operating system or coding a ...
Processes
... New: The process is begin created Running: Instructions are being executed Waiting: The process is waiting for some event to occur (such as an I/O completion or reception of a ...
... New: The process is begin created Running: Instructions are being executed Waiting: The process is waiting for some event to occur (such as an I/O completion or reception of a ...
ppt
... clone() creates a new task with its own identity, but that is allowed to share the data structures of its parent ...
... clone() creates a new task with its own identity, but that is allowed to share the data structures of its parent ...
P 1
... I/O-bound & CPU-bound How does the OS know whether a process is I/O-bound or CPU-bound? - can monitor the behavior of a process & save the info in the PCB - example: how much CPU time did the process use in its recent time quanta? (a small fraction => I/O intensive; all of the quantum => CPU intens ...
... I/O-bound & CPU-bound How does the OS know whether a process is I/O-bound or CPU-bound? - can monitor the behavior of a process & save the info in the PCB - example: how much CPU time did the process use in its recent time quanta? (a small fraction => I/O intensive; all of the quantum => CPU intens ...
Multiple Processor Systems
... • Multicore simply means ‘‘more than one core,’’ but when the number of cores grows well beyond the reach of finger counting, we use another name. Manycore chips are multicores that contain tens, hundreds, or even thousands of cores. • Thousands of cores are not even that special any more. The most ...
... • Multicore simply means ‘‘more than one core,’’ but when the number of cores grows well beyond the reach of finger counting, we use another name. Manycore chips are multicores that contain tens, hundreds, or even thousands of cores. • Thousands of cores are not even that special any more. The most ...
PPTX - Duke Computer Science
... Pre-allocating endpoint queues and passing pointers to exchange heap memory naturally allow zero copy implementations of multi-SIP subsystems, such as the I/O stack. For example, disk buffers and network packets can be transferred across multiple channels, through a protocol stack and into an applic ...
... Pre-allocating endpoint queues and passing pointers to exchange heap memory naturally allow zero copy implementations of multi-SIP subsystems, such as the I/O stack. For example, disk buffers and network packets can be transferred across multiple channels, through a protocol stack and into an applic ...
Concurrency (January 10)
... program into a text segment, and setting up a stack for temporary data. Switching the CPU between two processes may be relatively expensive as well, since the CPU context (which consists of register values, program counter, stack counter, etc) must be saved. Context switching also requires inval ...
... program into a text segment, and setting up a stack for temporary data. Switching the CPU between two processes may be relatively expensive as well, since the CPU context (which consists of register values, program counter, stack counter, etc) must be saved. Context switching also requires inval ...
QNX Corporate Sales Presentation
... Performance Implications Snoop traffic expected on SMP Cache hits generally cause no bus transaction Multiple processors writing to same location degrades performance (ping-pong effect) Performance degrades when large amount of data modified on one processor and read on the other Sometime ...
... Performance Implications Snoop traffic expected on SMP Cache hits generally cause no bus transaction Multiple processors writing to same location degrades performance (ping-pong effect) Performance degrades when large amount of data modified on one processor and read on the other Sometime ...
The Java Virtual Shell and Kernel
... operating systems that supports Java Runtime Environment. The shell and kernel would be designed in such a way that the beneath platform (operating system and hardware) should not impact on the syntax and output. Also there should be a unique set of commands that we are going to develop, which will ...
... operating systems that supports Java Runtime Environment. The shell and kernel would be designed in such a way that the beneath platform (operating system and hardware) should not impact on the syntax and output. Also there should be a unique set of commands that we are going to develop, which will ...
Mr. Cathcart`s Presentation - Silicon Valley World Internet Center
... Resources expressed as OGSA Services: The next level of virtualization OGSA Common Resource Model Architecture Abstract representation of “logical” IT resource (node, process, disk, file system, IP address, XML database, Security service, Commerce Server) described as a web services interface (WSDL ...
... Resources expressed as OGSA Services: The next level of virtualization OGSA Common Resource Model Architecture Abstract representation of “logical” IT resource (node, process, disk, file system, IP address, XML database, Security service, Commerce Server) described as a web services interface (WSDL ...
presentation source
... the queue. Problem now becomes one of much busy waiting as the receiver polls multiple queues in a loop (Figure 8.11 (b)). – Can create children to handle each queue you want to receive on using traditional blocking (Figure 8.11 (a)). – Can create a new system call that permits a process to block wa ...
... the queue. Problem now becomes one of much busy waiting as the receiver polls multiple queues in a loop (Figure 8.11 (b)). – Can create children to handle each queue you want to receive on using traditional blocking (Figure 8.11 (a)). – Can create a new system call that permits a process to block wa ...
Chapter 9 Uniprocessor Scheduling
... – FCFS performs better for long processes than short ones – I/O processes have to wait until CPU-bound process completes – Convoy effect: All other processes wait for the big process to finish ...
... – FCFS performs better for long processes than short ones – I/O processes have to wait until CPU-bound process completes – Convoy effect: All other processes wait for the big process to finish ...
Implementing Processes, Threads, and Resources
... Operating Systems: A Modern Perspective, Chapter 3 ...
... Operating Systems: A Modern Perspective, Chapter 3 ...
Processes and OS Basics
... • What happens if the running processes use more virtual memory than the amount of available physical memory? • What is a page hit? a page fault? • Why should the OS try to minimise the number of page faults? • Can you think of other strategies for swapping out memory pages than the LRU (Least Recen ...
... • What happens if the running processes use more virtual memory than the amount of available physical memory? • What is a page hit? a page fault? • Why should the OS try to minimise the number of page faults? • Can you think of other strategies for swapping out memory pages than the LRU (Least Recen ...
CS540_Ch19
... ◦ Time required to translate logical address to physical address especially in case of Translation Look aside Buffer(TLB) miss – may be prohibited in hard real time systems. ...
... ◦ Time required to translate logical address to physical address especially in case of Translation Look aside Buffer(TLB) miss – may be prohibited in hard real time systems. ...
Chapter 19 Real
... ◦ Time required to translate logical address to physical address especially in case of Translation Look aside Buffer(TLB) miss – may be prohibited in hard real time systems. ...
... ◦ Time required to translate logical address to physical address especially in case of Translation Look aside Buffer(TLB) miss – may be prohibited in hard real time systems. ...
Computer Network and Infrastructure
... Monitors Software that controls the running programs Batch jobs together Program branches back to monitor when finished Resident monitor is in main memory and available for execution It used a programming language called Job Control Language Provides instruction to the monitor what c ...
... Monitors Software that controls the running programs Batch jobs together Program branches back to monitor when finished Resident monitor is in main memory and available for execution It used a programming language called Job Control Language Provides instruction to the monitor what c ...
CS 519 -- Operating Systems -
... SJN, SRT, and HRRN alleviate the problem with FIFO, but require information on the length of each process. This information is not always available (although it can sometimes be approximated based on past history or user input) Feedback is a way of alleviating the problem with FIFO without infor ...
... SJN, SRT, and HRRN alleviate the problem with FIFO, but require information on the length of each process. This information is not always available (although it can sometimes be approximated based on past history or user input) Feedback is a way of alleviating the problem with FIFO without infor ...
10CSE
... Priorities Implemented by having multiple ready queues to represent each level of priority Scheduler the process of a higher priority over one of lower priority Lower-priority may suffer starvation To alleviate starvation allow dynamic priorities ...
... Priorities Implemented by having multiple ready queues to represent each level of priority Scheduler the process of a higher priority over one of lower priority Lower-priority may suffer starvation To alleviate starvation allow dynamic priorities ...
Chapter Four : Processor Management
... Transition Among Process States HOLD to READY : Job Scheduler using a predefined policy. READY to RUNNING : Process Scheduler using some predefined algorithm RUNNING back to READY : Process Scheduler according to some predefined time limit or other criterion. RUNNING to WAITING : Process Sc ...
... Transition Among Process States HOLD to READY : Job Scheduler using a predefined policy. READY to RUNNING : Process Scheduler using some predefined algorithm RUNNING back to READY : Process Scheduler according to some predefined time limit or other criterion. RUNNING to WAITING : Process Sc ...
Operating Systems
... Each device controller is in charge of a particular device type. Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by ...
... Each device controller is in charge of a particular device type. Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by ...