Linux Kernel - Teacher Pages
... Using clone gives an application fine-grained control over exactly what is shared between two threads In fact, fork is a special case of clone. ...
... Using clone gives an application fine-grained control over exactly what is shared between two threads In fact, fork is a special case of clone. ...
PPT - LSU CCT - Louisiana State University
... Multiprogramming needed for efficiency – Single user cannot keep CPU and I/O devices busy at all times – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has t ...
... Multiprogramming needed for efficiency – Single user cannot keep CPU and I/O devices busy at all times – Multiprogramming organizes jobs (code and data) so CPU always has one to execute – A subset of total jobs in system is kept in memory – One job selected and run via job scheduling – When it has t ...
lec4
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
... • If there are n processes in the ready queue and the time quantum is q, then each process gets 1/n of the CPU time in chunks of at most q time units at once. No process waits more than (n-1)q time units. ...
Mutual Exclusion and Synchronization
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
... Enforce Single Access • If we enforce a rule that only one process may enter the function at a time then: • P1 & P2 run on separate processors • P1 enters echo first, – P2 tries to enter but is blocked – P2 suspends ...
Chapter 5 Concurrency: Mutual Exclusion and Synchronization
... int testval, int newval) { /* checks a memory location (*word) against a test value (testval) */ int oldval; oldval = *word; if (oldval == testval) *word = newval; return oldval; ...
... int testval, int newval) { /* checks a memory location (*word) against a test value (testval) */ int oldval; oldval = *word; if (oldval == testval) *word = newval; return oldval; ...
1 Interprocess Communication Cooperating Processes The
... defined parts called "threads". Threads allow virtually parallel execution of different sections of a program. A thread is the smallest unit of executable code. A process can consist of several threads. ...
... defined parts called "threads". Threads allow virtually parallel execution of different sections of a program. A thread is the smallest unit of executable code. A process can consist of several threads. ...
Towards High-Performance Application-Level Storage
... Figure 1: Overhead in µs of various Linux filesystem implementations, when conducting small, persistent writes. Our approach instead is to associate each application with the directories and files it manages, as if they were dynamically mounted network file systems. This way, an application is free ...
... Figure 1: Overhead in µs of various Linux filesystem implementations, when conducting small, persistent writes. Our approach instead is to associate each application with the directories and files it manages, as if they were dynamically mounted network file systems. This way, an application is free ...
Exam Review Andy Wang Operating Systems COP 4610 / CGS 5765
... assignments 1-4, and project 1 8 points based on your ability to apply various principles learned in the class ...
... assignments 1-4, and project 1 8 points based on your ability to apply various principles learned in the class ...
CS533 Concepts of Operating Systems
... The “Fault” operation is an example of extensibility – measures the time to resolve a page fault by a user-defined pager in a separate address space. “Trap” – Latency between a write operation to a protected page, and the invocation of related exception handler. “Appel1” – Time to access a random pr ...
... The “Fault” operation is an example of extensibility – measures the time to resolve a page fault by a user-defined pager in a separate address space. “Trap” – Latency between a write operation to a protected page, and the invocation of related exception handler. “Appel1” – Time to access a random pr ...
lec03-concurrency
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
... – Internally concurrent because have to deal with concurrent requests by multiple users – But no protection needed within kernel ...
Chapter_05
... • Parallelism: quality of occurring at the same time – Two tasks are parallel if they are performed at the same time – Obtained by using multiple CPUs • As in a multiprocessor system ...
... • Parallelism: quality of occurring at the same time – Two tasks are parallel if they are performed at the same time – Obtained by using multiple CPUs • As in a multiprocessor system ...
Lecture 6 File Systems
... • the number of blocks in the partition • the size of the blocks • a free-block count • free-block pointers ...
... • the number of blocks in the partition • the size of the blocks • a free-block count • free-block pointers ...
COS 318: Operating Systems Virtual Machine Monitors Jaswinder Pal Singh
... ESX Server – Memory Virtualization Maintains shadow page tables with virtual to machine address mappings. u Shadow page tables are used by the physical processor u ESX maintains the pmap data structure for each VM with “physical” to machine address mappings u ESX can easily remap a machine pa ...
... ESX Server – Memory Virtualization Maintains shadow page tables with virtual to machine address mappings. u Shadow page tables are used by the physical processor u ESX maintains the pmap data structure for each VM with “physical” to machine address mappings u ESX can easily remap a machine pa ...
Device controllers
... ■ System must handle error gracefully (if can) ■ Good OSs will provide enough information to debug and ...
... ■ System must handle error gracefully (if can) ■ Good OSs will provide enough information to debug and ...
ppt
... Copy of the parent’s open file descriptors Parent and child share access to open files ...
... Copy of the parent’s open file descriptors Parent and child share access to open files ...
2. OS Structures - FSU Computer Science
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing ...
... Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing ...
PPT - CS
... to improve performance. • But it can cause reliability issues: – It delays the writeback to disk – Therefore if we are unlucky the data may be lost. ...
... to improve performance. • But it can cause reliability issues: – It delays the writeback to disk – Therefore if we are unlucky the data may be lost. ...
Accelerating Virtual Machine Storage I/O for Multicore Systems
... and VMM on a single CPU. While VMM deals with an exit, all processor in the guest OS become completely stopped. It introduces the third type of cost, synchronous cost. Landau et al. [4] showed that the direct cost on its own is high and the indirect and synchronous cost can be even an order of magni ...
... and VMM on a single CPU. While VMM deals with an exit, all processor in the guest OS become completely stopped. It introduces the third type of cost, synchronous cost. Landau et al. [4] showed that the direct cost on its own is high and the indirect and synchronous cost can be even an order of magni ...
sending alerts when things change. Change management is critical.
... exposure—dominated the conference, with a total of 11 papers presented either by NetBSD developers or on NetBSD-related topics. The first talk I attended was Antti Kantee’s presentation on “Using Application-Driven Checkpointing for Hot Spare High Availability,” in which he discussed a kernel interf ...
... exposure—dominated the conference, with a total of 11 papers presented either by NetBSD developers or on NetBSD-related topics. The first talk I attended was Antti Kantee’s presentation on “Using Application-Driven Checkpointing for Hot Spare High Availability,” in which he discussed a kernel interf ...
CS350-03-concurrency
... unit of execution within a process (like a lightweight process – an "lwp") also called a "task" Share address space, data and devices with other threads within the process Private stack, status (IC, state, etc) ...
... unit of execution within a process (like a lightweight process – an "lwp") also called a "task" Share address space, data and devices with other threads within the process Private stack, status (IC, state, etc) ...
Typical Multiprocessing Configurations
... • Designed to be modular so several programmers can work on sections of a large project independently of one another. Specification part, which has all information that must be visible to other units (argument list) Body part made up of implementation details that don’t need to be visible to oth ...
... • Designed to be modular so several programmers can work on sections of a large project independently of one another. Specification part, which has all information that must be visible to other units (argument list) Body part made up of implementation details that don’t need to be visible to oth ...
File
... that is considered abnormal; for example, a user program that attempts to divide by zero. It may also be generated by a running process that issues a service request from the operating system; for example, a program that attempts to access protected memory or execute a privileged instruction. A trap ...
... that is considered abnormal; for example, a user program that attempts to divide by zero. It may also be generated by a running process that issues a service request from the operating system; for example, a program that attempts to access protected memory or execute a privileged instruction. A trap ...
IV. Parallel Operating Systems
... We address the major architectural issues in these operating systems, with a greater emphasis on the basic mechanisms that constitute their core: process management, le system, memory management and communications. For each component of the operating system, the presentation covers its architecture ...
... We address the major architectural issues in these operating systems, with a greater emphasis on the basic mechanisms that constitute their core: process management, le system, memory management and communications. For each component of the operating system, the presentation covers its architecture ...
... Of course, not all applications need customized resource management. Instead of communicating with the exokernel directly, we expect most programs to be linked with libraries that hide lowlevel resources behind traditional operating system abstractions. However, unlike traditional implementations of ...