What scheduling algorithm assigns the CPU

to the process with the highest priority?

Which Scheduling algorithm allocates the

CPU first to the process that requests CPU first?

The interval from the line of submission of a process to the time of completion is termed as ____

The processes that are residing in main memory and are ready and waiting to execute are kept on a list called:

In priority scheduling algorithm:

CPU scheduling is the basis of ___________

Scheduling is done so as to ____________

What is Turnaround time?

What is Waiting time?

What is Scheduling?

In multilevel feedback scheduling algorithm ____________

Which one of the following can not be scheduled by the kernel?

Process are classified into different groups in ____________

In priority scheduling algorithm, when a process arrives at the ready queue, its priority is compared with the priority of ____________

Provide an environment for execution of programs and services to programs and users

Almost all operating systems have a user interface (UI).

3 Types of User Interface

The system must be able to load a program into memory and to run that program, end execution, either normally or abnormally (indicating error).

A running program may require I/O, which may involve a file or an I/O device.

The file system is of particular interest.

Programs need to read and write files and directories, create and delete them, search them, list file Information, permission management.

Processes may exchange information, on the same computer or between computers over a network.

Communications may be via _____________ or through message passing (packets moved by the OS)

OS needs to be constantly aware of possible errors.

For each type of error, OS should take the appropriate action to ensure correct and consistent computing.

When multiple users or multiple jobs running concurrently, resources must be allocated to each of them.

To keep track of which users use how much and what kinds of computer resources.

The owners of information stored in a multiuser or networked computer system may want to control use of that information, concurrent processes should not interfere with each other.

Involves ensuring that all access to system resources is controlled.

Requires user authentication, extends to defending external I/O devices from invalid access attempts.

Allows direct command entry.

Sometimes multiple flavors implemented (called shells).

User-friendly desktop metaphor interface..

Represent files, programs, actions, etc.

Touchscreen devices does not require new interfaces.

Choose which of these are touchscreen devices new interfaces:

Programming interface to the services provided by the OS.

Typically written in a high-level language (C or C++).

System calls are mostly accessed by programs via a high-level _____________________ rather than direct system call use.

System call implementation has a number associated with each call.

This maintains a table indexed according to these numbers.

For determining bugs, single step execution.

For managing access to shared data between processes.

Some ask the system for info - date, time, amount of available memory, disk space, number of users

Typically, these programs format and print the output to the terminal or other output devices.

Used to store and retrieve configuration information.

Provide the mechanism for creating virtual connections among processes, users, and computer systems.

Launch at boot time.

Known as services, subsystems, daemons.

Operating system should be convenient to use, easy to learn, reliable, safe, and fast.

Operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient.

"What will be done?"

"How to do it?"

Objective-C API for developing apps.

iOS Layer for graphics, audio, video.

Provides cloud computing, databases.

Structured on Mac OS X, added functionality.

 Does not run OS X applications natively.

Developed by Open Handset Alliance (mostly Google).

Based on Linux kernel but modified.

Runtime environment includes core set of libraries and Dalvik virtual machine.

Debugging is finding and fixing errors, or ______.

OS generate log files containing error information.

Failure of an application can generate ___________ file capturing memory of the process

Operating system failure can generate _________ file containing kernel memory.

Is a performance analysis tool in Solaris, FreeBSD, Mac OS X allows live instrumentation on production systems.

Program obtains information concerning the specific configuration of the hardware system.

Small piece of code, stored in ROM or EFROM, that locates the kernel, loads it into memory, and starts it.

Allows selection of kernel from multiple disks, versions, kernel options.

Multiple flavors implemented in CLI are called:

6 Types of System Calls:

1. Process Control

2 - 6. ???????????????????????

Absolute loaders, relocatable loaders, linkage editors, and overlay-loaders, debugging systems for higher-level and machine language.

The separation of policy from mechanism is a very important principle, it allows maximum flexibility if policy decisions are to be changed later (example – timer).

Written to provide the most functionality in the least space.

Which of these doesn't SYSGEN ask?