ISE 218 Units 5-9

Calculate the overall speedup of a system that spends 90% of its time in calculations with a processor upgrade that provides for 200% greater throughput.

150%

Disk and tape are forms of _______ storage.

durable

MTTF means:

mean time to failure

I/O channels are driven by small CPUs called I/O processors. (T or F)

True

Which of the following I/O control architectures uses polling?

programmed I/O

A simpler and more elegant approach is memory-mapped I/O because I/O devices and main memory share the:

same address space

A disadvantage of RAID-1 is that it is costly and requires large memory space. (T or F)

True

________ law states that the interrelationship of all components with the overall efficiency of a computer system with a simple formula.

Amdahl’s

Access time is:

the sum of the rotational delay and the seek time.

Solid-state drives consist of a microcontroller and flash memory. (T or F)

True

RAID systems use either mirroring or striping (or a combination of both). (T or F)

True

Electrical signal loss over time or distance during data transfer is called:

attenuation.

________ is the oldest and most cost-effective of all mass-storage devices.

Magnetic tape

RAID-10 combines the striping of RAID-0 with the mirroring of RAID-1. (T or F)

True

Which one of the following is characteristic of RAID 0?

low reliability

Disk cache memory is usually associative memory type; they are usually smaller because lookup performance is better. (T or F)

True

A ________ is moving the disk arm from the innermost track to the outermost, or vice versa.

full-stroke seek

SPEC’s main objective is to establish equitable and realistic methods for computer performance measurement. (T or F)

True

Real-time systems are used for process control in manufacturing plants, assembly lines, robotics, and complex physical systems. (T or F)

True

________ occurs when data is prefetched and cache is filled with data that no process needs, leaving less space for useful data.

Cache pollution

The output from the Java compiler is a binary class file that is executed by a:

Java Virtual Machine

Simulation is very useful for estimating the performance of systems or system configurations that do not yet exist. (T or F)

True

(A) ________ is a precursor to modern operating systems that allowed programs to be processed without human interaction.

resident monitor

A computer user is typically most concerned with:

response time

Clock speed, MIPS, and FLOPS are the metrics in comparing relative performance across a line of similar computers offered by the same vendor. (T or F)

True

One of the major challenges of system simulation lies in determining the characteristics of the workload. (T or F)

True

MIPS, in the context of computer performance, stands for:

millions of instructions per second.

Operating system user interfaces are divided into two general categories: command-line interfaces and graphical user interfaces. (T or F)

True

A timesharing system doesn’t permit the systems to be accessed by multiple concurrent users. (T or F)

False

Which computer language is famous for the mantra “write once, run anywhere?”

Java

Java programs are stored in an intermediate code called bytecode. (T or F)

True

A ________ is the smallest schedulable unit in a modern operating system. (T or F)

thread

________ schedules the processor in the order in which they are requested.

First-come, first-served scheduling

________ gather(s) detailed behavior using hardware or software probes into the activity of the component of interest.

System traces

The final output of assemblers is a stream of ________.

machine code instructions

________ share a single centralized memory.

Tightly coupled multiprocessors

Disk scheduling algorithms are necessary because we want to minimize the movement of the disk arm motion. (T or F)

True