Test Your Performance Skills - 2nd Part

Ten haircuts per hour is a measure of...

• Response Time
• Velocity
• Throughput
• Utilization / usage.

The throughput of a service center measures...

• Units of work processed per unit of time
• The elapsed time to process one unit of work
• The elapsed time to process many units of work

The bandwidth is...

• The average response time of many requests
• The maximum achievable throughput

The response time can grow to infinity (I’ve seen graphs in which response time goes to infinity!)...

• In practical cases
• In theoretical models

• Never
• Always

Is possible to be at 100% cpu usage and, at the same time, to have an acceptable response time?

• Yes
• No

If we move a certain workload to a new server with half performance capacity of the original one, what will happen to the response time?

• Increase slightly
• Increase heavily
• Simply increase (but cannot predict how much)
• Remain stable
• Decrease

To get serviced a customer has to visit two desks, A and B in strict sequence,  The customer spends 5 min in A, and 10 min in B. Which is the total residence time?

• 5 min
• 10 min
• 15 min
• 7.5 min (the average of 5 and 10 min)

Which is the bandwidth of the previous service center?

• 9 customers per hour
• 4 customers per hour
• 12 customers per hour
• 6 customers per hour

You, as a great performance analyst, has been asked to place an additional clerk (to work in parallel) in one of the desks, A or B. Where would you place him/her?

• At the entrance (for marketing purposes)
• Desk A
• Desk B
• At the exit (for customer satisfaction feedback)

What of the above sentences truly quantify the improvement of your previous recommendation, if any.

• There is hardly a performance gain
• The new residence time is 10 min
• The new bandwidth is 12 customers per hour
• The new throughput is 12 customers per hour
• The new bandwidth is 6 customers per hour