Engineering High School

Suppose we have four jobs in a computer system, in the order JOB1, JOB2, JOB3 and JOB4. JOB1 requires 8 s of CPU time and 8 s of I/O time; JOB2 requires 4 s of CPU time and 14 s of disk time; JOB3 requires 6 s of CPU time; and, JOB4 requires 4 s of CPU time and 16 s of printer time. Define the following quantities for system utilization: • Turnaround time = actual time to complete a job • Throughput = average number of jobs completed per time period T • Processor utilization = percentage of time that the processor is active (not waiting) Compute these quantities (with illustrations if needed) in each of the following systems: a. A uniprogramming system, whereby each job executes to completion before the next job can start its execution. b. A multiprogramming system that follows a simple round-robin scheduling. Each process gets 2 s of CPU time turn-wise in a circular manner.

Answers

Answer 1

Answer:

Explanation:

a. Uniprogramming System:

Turnaround Time: For JOB1, the turnaround time is 16 s (8 s CPU time + 8 s I/O time). For JOB2, the turnaround time is 18 s (4 s CPU time + 14 s disk time). For JOB3, the turnaround time is 6 s (6 s CPU time). For JOB4, the turnaround time is 20 s (4 s CPU time + 16 s printer time).

Throughput: In a uniprogramming system, the throughput is equal to 1 job per time period, as only one job can be processed at a time.

Processor Utilization: For JOB1, the processor utilization is 8/16 = 50%. For JOB2, the processor utilization is 4/18 = 22.2%. For JOB3, the processor utilization is 6/6 = 100%. For JOB4, the processor utilization is 4/20 = 20%.

b. Multiprogramming System:

Turnaround Time: For JOB1, the turnaround time is 24 s (8 s CPU time + 8 s I/O time + 8 s waiting). For JOB2, the turnaround time is 24 s (4 s CPU time + 14 s disk time + 6 s waiting). For JOB3, the turnaround time is 16 s (6 s CPU time + 10 s waiting). For JOB4, the turnaround time is 32 s (4 s CPU time + 16 s printer time + 12 s waiting).

Throughput: In a multiprogramming system, the throughput is equal to 4 jobs per time period, as all four jobs can be processed concurrently.

Processor Utilization: For JOB1, the processor utilization is 8/24 = 33.3%. For JOB2, the processor utilization is 4/24 = 16.7%. For JOB3, the processor utilization is 6/16 = 37.5%. For JOB4, the processor utilization is 4/32 = 12.5%.

Answer 2

Here are the turnaround time, throughput, and processor utilization for the four jobs in a uniprogramming and round-robin system:

Uniprogramming

Turnaround time:

JOB1: 16 s

JOB2: 22 s

JOB3: 12 s

JOB4: 20 s

Throughput: 1 job/16 s

Processor utilization: 50%

Round-Robin

Turnaround time:

JOB1: 18 s

JOB2: 14 s

JOB3: 10 s

JOB4: 18 s

Throughput: 2 jobs/16 s

Processor utilization: 62.5%

The difference in turnaround time between the two systems is due to the fact that in a uniprogramming system, the CPU is idle while a job is waiting for I/O. In a round-robin system, the CPU is always running, even if it is only running a short burst of code for another job.

The difference in throughput between the two systems is also due to the fact that in a round-robin system, the CPU is always running, so more jobs can be completed in a given amount of time.

The processor utilization is higher in a round-robin system because the CPU is not idle as often. However, the turnaround time is also higher because the jobs have to share the CPU.

Read more about throughput here:

https://brainly.com/question/28390124

#SPJ2

Related Questions

Can someone convert this code into python? Please I need this code immediately.
int main(void)
{
double a[5],b[5],c=0;
int i;
for(i=0;i<5;i++)//입력
{
scanf("%lf %lf",&a[i],&b[i]);
}
for(i=0;i<5;i++)
{
c+=(b[i]-a[i]-1.0>0) ? ((b[i]-a[i]-1.0>4) ? 4.0 : b[i]-a[i]-1.0): 0;
}
c/=0.5;
c*=5000;
if(c>=150000)
c*=0.95;
else if(c<=50000)
c*=1.05;

printf("%.0f",c);
}

Answers

Here's the Python equivalent of the given code:

```
def main():
a = [0] * 5
b = [0] * 5
c = 0

for i in range(5): # Input
a[i], b[i] = map(float, input().split())

for i in range(5):
c += ((b[i] - a[i] - 1.0) > 0) * (4.0 if (b[i] - a[i] - 1.0) > 4 else (b[i] - a[i] - 1.0))

c /= 0.5
c *= 5000

if c >= 150000:
c *= 0.95
elif c <= 50000:
c *= 1.05

print("{:.0f}".format(c))

main()
```

Note that the `scanf` function has been replaced with Python's `input` function, and the `printf` function has been replaced with Python's `print` function with formatted output.

Can somebody help me with these. with solution

1 Two balls are drawn in succession without replacement from a box containing 4 red balls and 3 black balls. Let Y be the random variable, where Y is the number of the red balls. What is the expected value of this random event?

2. Two balls are drawn in succession from a box without repetition containing 3 red 3 blue and four yellow marbles. What is the probability that they are of the same color?

Answers

Answer:

See below, please.

Explanation:

Part 1.

Let Y be the random variable representing the number of red balls drawn in succession. The possible outcomes are (R, R), (R, B), (B, R), and (B, B). We can calculate the probability of each outcome as follows

P(Y=0) = P(B, B) = (3/7) * (2/6) = 1/7

P(Y=1) = P(R, B) + P(B, R) = (4/7) * (3/6) + (3/7) * (4/6) = 12/42 + 12/42 = 24/42

P(Y=2) = P(R, R) = (4/7) * (3/6) = 2/7

The expected value of Y is given by:

E(Y) = Σ yi * P(Y=y)

= 0 * (1/7) + 1 * (24/42) + 2 * (2/7)

= 0 + 8/14 + 4/7

= 16/14

= 1.14

Therefore, the expected value of Y is 1.14.

Part 2.

The total number of ways to draw two marbles from the box is 10C2 = 45. The number of ways to draw two marbles of the same color is 3C2 + 4C2 = 3 + 6 = 9. Therefore, the probability of drawing two marbles of the same color is

P(same color) = 9/45 = 1/5

Therefore, the probability that the two balls are of the same color is 1/5.

Construct a triangle , having its perimeter = 55 mm and the ratio of its angles 2:1:3 . I want the steps along with the drawing . this is ENGINEERING GRAPHICS grade 11 question .​

Answers

Answer:

  see attached

Explanation:

You want to construct a triangle with a perimeter of 55 mm and angles in the ratio 2:1:3.

Angles

The 2+1+3 = 6 ratio units represent 180°, the sum of angles in a triangle. Hence each unit in the ratio is 180°/6 = 30°.

The angles are 60° : 30° : 90°.

Perimeter

From your knowledge of "special triangles," you know the side lengths in a 30°-60°-90° triangle have the ratios 1 : √3 : 2.

That is, the perimeter of the triangle is (1+√3 +2) = 3+√3 times the length of the shortest side.

Side lengths

The shortest side of the triangle will have the length ...

  [tex]\dfrac{55\text{ mm}}{3+\sqrt{3}}=\dfrac{(3-\sqrt{3})(55\text{ mm})}{(3-\sqrt{3})(3+\sqrt{3})}= \dfrac{(165-55\sqrt{3})\text{ mm}}{3^2-(\sqrt{3})^2}\\\\\\=(27.5-\dfrac{55}{6}\sqrt{3})\text{ mm}\approx 11.6229\text{ mm}[/tex]

The longest side will be double this length, about 23.2457 mm. The side of intermediate length will be (55√3 -55)/2 ≈ 20.1314 mm.

Construction

If you're doing the drawing using only a compass and straightedge, you will start by constructing perpendicular lines (the right angle). Mark off 1 and two lengths of the shortest side on one of these perpendicular segments. Then draw the hypotenuse as 2 times the short length from the end of the short length. It will intersect the perpendicular segment at √3 times the short length.

The tricky part here is constructing a line segment of the desired irrational length. One way to do this is to construct a 30-60-90 triangle with a unit-length short side, then "unfold" it to a line segment with parts that are 1, √3, and 2 units long. A "proportioning" construction can divide the 55 mm length of the perimeter into these proportions, (10 mm might be a good "unit length" for this.)

__

Additional comment

The desired dimensions are sufficiently small that an accurate compass/straightedge construction will be difficult. It is unlikely your pencil line width is much less than about 0.2 mm, so already the error is about 2% in any length.

The attached drawing was made by telling the software what lengths we wanted in "exact" terms. Its calculation is generally good to 10 sf or better. To scale the drawing properly, you'd have to make the longest side about 23.25 mm, or 0.9152 inches.

Other Questions
Various states are trying to reduce the time and cost of settling vehicle injury cases. One of those alternatives isSelect one:a. Omitting uninsured motorist's protectionb. Requiring the driver to pay all medical expenses c. Using the no-fault systemd. Requiring emergency road service coveragee. Having the state pay for driver's insurance an example of which nontraditional work schedule allows an employee to choose to work a 7:00 a.m. to 3:00 p.m. shift rather than the more traditional 9:00 a.m. to 5:00 p.m. workday? guys pls help and do it like 1a: _________ for all the questions thanks what is the role of nadp in photosynthesis? group of answer choices pick up and drop off electrons absorb sunlight energy convert carbon dioxide to rubisco phosphorylate adp to atp when a united states corporation provides financial incentives to officials in foreign countries in order to avoid local taxes, that corporation has: blank . multiple choice question. which of the following is not an operating activity? which of the following is not an operating activity? cash receipts for interest earned. cash collections from credit customers. cash payments for operating expenses. cash payments for dividends to stockholders. true/false. The tradeoff between inflation and unemployment does not exist in the long run because people will adjust their expectations so that expected inflation equals the inflation rate. determine the length of the third side of a triangle from the choices provided if the first two sides measure 10 and 12.(1 point) responses What law said that anyone suspected as an enemy of the revolution could be arrested?answer choicesLaw of the EnemyLaw of the RevolutionLaw of LoyaltyLaw of RobespierreLaw of Suspects Dr. Neuman is a marketing professor and uses her students in research studies because they are convenient and readily accessible. She is using a _____ sample. true or false: requiring employees to take a two week vacation is an effective internal control procedure because it is more difficult to hide fraud or deceptive activities if an employee is absent from work for an extended period of time. A 5 kg particle moves along an x axis, being propelled by a variable force directed along that axis. Its position is given by x = 3 m + (5 m/s)t + ct2 - (4 m/s3)t3 with x in meters and t in seconds.The factor c is a constant. At t = 3 s the force on the particle has a magnitude of 33 N and is in the negative direction of the axis. What is c? Two trapezoids have areas of 432cm^2 and 48cm^2. Find the ratio of similarity Consider the three stars with the following method of energy transfer: Convection, Convection-Radiation, Radiation-Convection. The method of energy transfer is listed in order from the center of each star outward.1.) Rank the stars in order of their mass from most massive to least massive2.) Rank the stars in order of their temperatures from coolest to hottest. the muscle name literally meaning below the tongue is blank.target 1 of 5 the muscle connecting the hyoid bone to the styloid process of the temporal bone is the blank.target 2 of 5 the shorter of the muscles over the fibula is the blank.target 3 of 5 the muscle extending from the arm to the lateral forearm is the blank.target 4 of 5 the hamstring that becomes tendinous midway along its length is the What is true about angle APD? Suppose the heights of 18-year-old men are approximately normally distributed, with mean 71 inches and standard deviation 5 inches.(a) What is the probability that an 18-year-old man selected at random is between 70 and 72 inches tall? (Round your answer to four decimal places.)(b) If a random sample of eight 18-year-old men is selected, what is the probability that the mean height x is between 70 and 72 inches? (Round your answer to four decimal places.)(c) Compare your answers to parts (a) and (b). Is the probability in part (b) much higher? Why would you expect this?The probability in part (b) is much higher because the mean is larger for the x distribution.The probability in part (b) is much higher because the standard deviation is smaller for the x distribution. The probability in part (b) is much lower because the standard deviation is smaller for the x distribution.The probability in part (b) is much higher because the mean is smaller for the x distribution.The probability in part (b) is much higher because the standard deviation is larger for the x distribution. During the day, 25 trains pulled into the subway station. Of those trains, 14 were full.Find the experimental probability that the next train that pulls into the station is full at the beginning of act iv, scene i, of the tragedy of romeo and juliet, paris reports to friar lawrence that juliet is weeping. what is the true cause of her sadness? the radius of a circle is increasing at a rate of 4 cm/s. how fast is the area of the circle increasing after 10 seconds? g