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What do you understand by CPU-IO burst?
Waiting of IO burst called cpu burst
How do you xxplain how DMA offers an improvement over CPU programmed IO?
It offloads actual IO processing from CPU to the device hardware. This frequently allows the IO device to perform its operations on cycles that the CPU could not have made use of anyway, resulting in a double benefit.
Determining the length of next CPU Burst?
Taun+1 is the predicted value for the next cpu burst tn is the actual measured CPU BURST <= 0 Alfa => 1 then Taun+1= Alfa*tn + (1-Alfa)*tn
What are the advantages of memory mapped IO?
Memory mapped IO uses a portion of RAM to handle IO requests. In this manner, instructions the CPU uses for reading and writing memory can also be used for IO, reducing the circuitry needed. This makes the CPU simpler, cheaper and more effecient.
How does a device initiate communication with the CPU?
io/mem wire?
Difference between programmed IO and interrupt IO?
1.Programmed IO is the process of IO instruction written in computer program , where Interrupt Initiated IO is done by using interrupt and some special command. 2.The advantage of Interrupt Initiated IO is ,it is a time consuming process than Programmed IO. 3.In Programmed IO technique to transfer data,required constant motoring on peripheral by CPU,once data transfer is initiated, CPU have to wait for next transfer. In Interrupt Initiated IO once data transfer initiated ,CPU execute next program without wasting time and the interface keep monitoring the device. When the interface determines that the device is ready to transfer data, it generate an interrupt request,CPU stop the current task,execute the transferring process,and then return to the previous on-processing task.
What are the causes of bottleneck in your computer system?
The fundamentals of computer performance in terms of program execution always has three factors that influence performance 1. CPU 2. Memory and 3. IO (Input/Output) Any performance bottleneck will be related to one of these. To overcome the bottleneck you may need to increase the CPU capability if it is CPU bound, increase the memory if it is memory bound and remove the IO blocks if it is IO bound
Difference between io bound and CPU bound?
I/O-bound programs have the property of performing only a small amount of computation before performing IO. Such programs typically do not use up their entire CPU quantum. CPU-bound programs, on the other hand, use their entire quantum without performing any blocking IO operations. Consequently, one could make better use of the computer's resources by giving higher priority to I/O-bound programs and allow them to execute ahead of the CPU-bound programs.
What allows the processor to communicate with peripherals?
The key for any hardware piece to work with others is the SOFTWARE. That is why anything you buy for your computer (graphics cards, hard drives, etc.) it comes with software (or the driver) to help the computer recognize it and use it for the function its meant to be used for. I hope this is what you were looking for.
What is the function of a redirector?
To determine whether a request is meant for the client CPU or the server.To determine whether a request is meant for the client CPU or the server
What is Control Processing Unit burst and Input and Output burst?
The process of selecting the next job that will run on the CPU belongs to the short-term or CPU scheduler. The CPU scheduler can only pick from the jobs that are already in memory and ready to go. The scheduler works in cooperation with the interrupt system. • The scheduler assigns the CPU to perform computation on behalf of a particular process or thread within a process. • CPU can be "borrowed" from its current process by an interrupt. It is under the control of external devices not scheduler. Interrupts can be disabled for a short time. • When a process or thread requests an I/O transfer, it normally becomes ineligible to use the CPU until the transfer is complete. This means that the scheduler will have to choose a new process or a new thread within the same process to use the CPU. • The process or thread that requested the I/O again becomes eligible to use the CPU when the I/O transfer is complete. CPU I/O Burst Cycle The execution of a process consists of an alternation of CPU bursts and I/O bursts. A process begins and ends with a CPU burst. In between, CPU activity is suspended whenever an I/O operation is needed. • If the CPU bursts are relatively short compared to the I/O bursts, then the process is said to be I/O bound. For example, a typical data processing task involves reading a record, some minimal computation and writing a record. • If CPU bursts are relatively long compared to I/O bursts, a process is said to be CPU bound. A number crunching task involves an I/O burst to read parameters. A very long CPU burst and another I/O burst is required to write results
What is burst time?
In an operating system, burst time refers to the time that it takes to complete execution of a particular task or process. It is used in CPU scheduling.
