divendres, 18 de desembre del 2015

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
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Test Your Performance Skills (Responses)

A single-threaded compute-intensive program elapses 100 s when running in a system with one processor. What would the new elapsed time be if we upgrade the system with a processor twice as fast?
  • 100 s
  • 200 s
  • 50 s
A single-threaded compute-intensive program elapses 100 s when running in a system with one processor. What would the new elapsed time be if we upgrade the system with a second twin processor?
  • 100 s
  • 200 s
  • 50 s
IOPS (Input/Output Operations Per Second), is a performance measurement of
  • Response Time
  • Velocity
  • Throughput
  • Usage
The SAP Application Performance Standard, known as SAPS,  is a performance measurement of
  • Response Time
  • Velocity
  • Throughput
  • Usage
The storage subsystem XYZ delivers 10000 IOPS with an IO average response time of less than 5 ms. This implies that allowing a 10 ms response time per IO, it would deliver 20000 IOPS.
  • True
  • False
In a typical OLTP scenario doubling the workload, in the sense of doubling the number of users, implies doubling the response time.
  • True
  • False
In a typical OLTP scenario doubling the workload, in the sense of twice heavier requests, implies doubling the response time.
  • True
  • False
Doubling the processing capacity, in the sense of doubling the number of processors, implies halving the response time.
  • True
  • False
Doubling the processing capacity, in the sense of upgrading to a twice faster processor, implies halving the response time.
  • True
  • False
In a typical OLTP scenario an usage greater than 65% necessarily means bad response time.

  • True
  • False
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Test Your Performance Skills

A single-threaded compute-intensive program elapses 100 s when running in a system with one processor. What would the new elapsed time be if we upgrade the system with a processor twice as fast?
  • 100 s
  • 200 s
  • 50 s
A single-threaded compute-intensive program elapses 100 s when running in a system with one processor. What would the new elapsed time be if we upgrade the system with a second twin processor?
  • 100 s
  • 200 s
  • 50 s
IOPS (Input/Output Operations Per Second), is a performance measurement of
  • Response Time
  • Velocity
  • Throughput
  • Usage
The SAP Application Performance Standard, known as SAPS,  is a performance measurement of
  • Response Time
  • Velocity
  • Throughput
  • Usage
The storage subsystem XYZ delivers 10000 IOPS with an IO average response time of less than 5 ms. This implies that allowing a 10 ms response time per IO, it would deliver 20000 IOPS.
  • True
  • False
In a typical OLTP scenario doubling the workload, in the sense of doubling the number of users, implies doubling the response time.
  • True
  • False
In a typical OLTP scenario doubling the workload, in the sense of twice heavier requests, implies doubling the response time.
  • True
  • False
Doubling the processing capacity, in the sense of doubling the number of processors, implies halving the response time.
  • True
  • False
Doubling the processing capacity, in the sense of upgrading to a twice faster processor, implies halving the response time.
  • True
  • False
In a typical OLTP scenario an usage greater than 65% necessarily means bad response time.

  • True
  • False
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