Threads
... Kernel Threads Supported by the Kernel Kernel threads is slower to create and manage than user threads If a thread performs a blocking system call, the kernel can schedule ...
... Kernel Threads Supported by the Kernel Kernel threads is slower to create and manage than user threads If a thread performs a blocking system call, the kernel can schedule ...
Chapter 13: I/O Systems Silberschatz, Galvin and Gagne ©2013! Edition!
... ■ Use smarter hardware devices" ■ Balance CPU, memory, bus, and I/O performance for highest ...
... ■ Use smarter hardware devices" ■ Balance CPU, memory, bus, and I/O performance for highest ...
Operating-System Structures Chapter 2
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles,mainmemo ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles,mainmemo ...
Notes
... • Must ensure that a user program could never gain control of the computer in monitor mode (i.e., a user program that, as part of its execution, stores a new address in the interrupt vector). • System call - A privileged instruction provides a means for the user to interact with the OS to perform ta ...
... • Must ensure that a user program could never gain control of the computer in monitor mode (i.e., a user program that, as part of its execution, stores a new address in the interrupt vector). • System call - A privileged instruction provides a means for the user to interact with the OS to perform ta ...
Lecture 4, Part 1
... What Is Scheduling? • An operating system often has choices about what to do next • In particular: – For a resource that can serve one client at a time – When there are multiple potential clients – Who gets to use the resource next? – And for how long? ...
... What Is Scheduling? • An operating system often has choices about what to do next • In particular: – For a resource that can serve one client at a time – When there are multiple potential clients – Who gets to use the resource next? – And for how long? ...
Adopting and Commenting the Old Kernel Source Code for Education
... by taking a part for the whole, its hard to understand the entire system and is difficult to understand the design and implementations of an actual system. Although one may obtain some of the operating theory through reading classical books like the “The design of Unix operating system,” [4] the com ...
... by taking a part for the whole, its hard to understand the entire system and is difficult to understand the design and implementations of an actual system. Although one may obtain some of the operating theory through reading classical books like the “The design of Unix operating system,” [4] the com ...
PPT - Bilkent University Computer Engineering Department
... Fetch, Decode, Execute cycles for each instruction. ...
... Fetch, Decode, Execute cycles for each instruction. ...
ApplicationSecurity
... new processes and end them. – Memory management: Operating Systems allocate memory and manage the memory (e.g., free memory) etc., when processes are being executed. – Process scheduling: When multiple processes are competing with each other to run on ONE CPU, an OS is responsible for scheduling whi ...
... new processes and end them. – Memory management: Operating Systems allocate memory and manage the memory (e.g., free memory) etc., when processes are being executed. – Process scheduling: When multiple processes are competing with each other to run on ONE CPU, an OS is responsible for scheduling whi ...
memory is
... Keep track of which parts of memory are currently being used and by whom. Decide which processes to load when memory space becomes available. Allocate and deallocate memory space as needed. ...
... Keep track of which parts of memory are currently being used and by whom. Decide which processes to load when memory space becomes available. Allocate and deallocate memory space as needed. ...
Are Virtual-Machine Monitors Microkernels Done Right?
... Dom0 ) to encapsulate legacy device drivers [FHN+ 04]. Hence, any I/O operation implies 3.3 Treat the OS as a component at least one round-trip communication between the guest VM and Dom0 . The authors call this Under this heading, Hand et al. argue that a benefit a “simple asynchronous unidirection ...
... Dom0 ) to encapsulate legacy device drivers [FHN+ 04]. Hence, any I/O operation implies 3.3 Treat the OS as a component at least one round-trip communication between the guest VM and Dom0 . The authors call this Under this heading, Hand et al. argue that a benefit a “simple asynchronous unidirection ...
No Slide Title
... Processor-dependent code is isolated in a dynamic link library (DLL) called the “hardware abstraction layer” (HAL) ...
... Processor-dependent code is isolated in a dynamic link library (DLL) called the “hardware abstraction layer” (HAL) ...
multi-threading
... The OS should decide the creation of a new job only if the available resources are enough for this operation. ...
... The OS should decide the creation of a new job only if the available resources are enough for this operation. ...
Micro-CernVM: Slashing the Cost of Building and
... operating system’s package manager to install the desired packages in the CernVM-FS repository area.4 New and updated packages can then be installed incrementally by the package manager on top of the existing installation. While being very fast, this results, however, in an ever-changing operating s ...
... operating system’s package manager to install the desired packages in the CernVM-FS repository area.4 New and updated packages can then be installed incrementally by the package manager on top of the existing installation. While being very fast, this results, however, in an ever-changing operating s ...
What is an Operating System?
... A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. A less common term is word, a given computer architecture’s native unit of data. a computer that has 64-bit registers and 64-bit memory addressing typically has 64-bit (8-byte) words. A kilobyte, or KB, is 1,024 ...
... A byte is 8 bits, and on most computers it is the smallest convenient chunk of storage. A less common term is word, a given computer architecture’s native unit of data. a computer that has 64-bit registers and 64-bit memory addressing typically has 64-bit (8-byte) words. A kilobyte, or KB, is 1,024 ...
CS211 Slides
... – Portable Operating System Interface for Computer Environments (1984) – Most Unix systems try to conform with POSIX to a certain extent This ...
... – Portable Operating System Interface for Computer Environments (1984) – Most Unix systems try to conform with POSIX to a certain extent This ...
CS 5204 Operating Systems Fall 2005
... • The defining tragedy of the operating systems community has been the definition of an operating system as software that both multiplexes and abstracts physical resources. The view that the OS should abstract the hardware is based on the assumption that it is possible both to define abstractions th ...
... • The defining tragedy of the operating systems community has been the definition of an operating system as software that both multiplexes and abstracts physical resources. The view that the OS should abstract the hardware is based on the assumption that it is possible both to define abstractions th ...
The Operating System
... Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by the program and popped off the stack by the operating system Block and stack methods do not lim ...
... Parameters stored in a block, or table, in memory, and address of block passed as a parameter in a register This approach taken by Linux and Solaris Parameters placed, or pushed, onto the stack by the program and popped off the stack by the operating system Block and stack methods do not lim ...
The Nizza Secure-System Architecture
... In current systems, security-sensitive and securityinsensitive code often reside in the same protection domain. The presented principles of Nizza enable the drastic reduction of TCB size by moving security-sensitive functions from the commodity software to distinct protection domains, thereby elimin ...
... In current systems, security-sensitive and securityinsensitive code often reside in the same protection domain. The presented principles of Nizza enable the drastic reduction of TCB size by moving security-sensitive functions from the commodity software to distinct protection domains, thereby elimin ...
Midterm study guide
... some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be ...
... some processes that wish to enter their critical section, then the selection of the processes that will enter the critical section next cannot be ...
6-up pdf
... Because the cluster size is smaller than for the 16-bit FAT file system, the amount of internal fragmentation is reduced ...
... Because the cluster size is smaller than for the 16-bit FAT file system, the amount of internal fragmentation is reduced ...
the thread - Bilkent University Computer Engineering Department
... – GNU Portable Threads • Thread management done at user space, by a thread library ...
... – GNU Portable Threads • Thread management done at user space, by a thread library ...
Last Class: Threads and Scheduling Today: More on Scheduling
... Instead, choose a scheduling algorithm based on its ability to satisfy a policy • Minimize average response time - provide output to the user as quickly as possible and process their input as soon as it is received. • Minimize variance of response time - in interactive systems, predictability may ...
... Instead, choose a scheduling algorithm based on its ability to satisfy a policy • Minimize average response time - provide output to the user as quickly as possible and process their input as soon as it is received. • Minimize variance of response time - in interactive systems, predictability may ...