This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Hyperthreading In Pentium”.
1. Which of the following is a resource sharing strategy that had been investigated by the developers?
a) partitioned resources
b) threshold sharing
c) full sharing
d) all of the mentioned
View Answer
Explanation: Several resource sharing strategies have been investigated by the developers. Some of these are
1. Partitioned resources
2. Threshold sharing
3. Full sharing.
2. The feature of hyperthreading is
a) simultaneous multithreading
b) switching is not required
c) effective use of processor resources
d) all of the mentioned
View Answer
Explanation: Hyperthreading used the concept of simultaneous multithreading, where multiple threads can be executed on a single processor without switching.
3. Each logical processor maintains a set of architecture state which consists of
a) general purpose registers
b) machine state register
c) advanced programmed interrupt controller
d) all of the mentioned
View Answer
Explanation: Each logical processor maintains a set of architecture state which consists of
1. Registers including the general purpose registers
2. The control register
3. Advanced programmed interrupt controller
4. Machine state register.
4. A logical processor may be temporarily stalled for
a) including servicing cache misses
b) handling branch mispredictions
c) waiting for results of previous instructions
d) all of the mentioned
View Answer
Explanation: A logical processor may be temporarily stalled for a variety of reasons like including servicing cache misses, handling branch mispredictions and waiting for results of previous instructions.
5. The hyperthreading technology automatically involves the
a) decrease of die area
b) increase of die area
c) decrease of die area to half
d) none
View Answer
Explanation: The hyperthreading technology automatically involves the increase of die area.
6. The instruction that is used when either of the logical processors is idle is
a) HOLD
b) HLDA
c) HALT
d) NONE
View Answer
Explanation: An optimization may require the use of HALT instruction, when either of the two logical processors is idle.
7. The mode that is available when there is only one software thread to execute is
a) single task mode
b) multi task mode
c) single task and multi task mode
d) dual task mode
View Answer
Explanation: When there is only one software thread to execute, there are two modes namely single task mode and multi task mode.
8. The HALT instruction is a privileged instruction that can be only used by
a) execution unit
b) operating system
c) control unit
d) memory unit
View Answer
Explanation: The HALT instruction is a privileged instruction that can be only used by operating system.
9. When the operating system uses HALT instruction on a processor which supports multithreading, the operation moves from
a) Single task to multi task mode
b) ST1 to ST0
c) Multi task to single task mode
d) None
View Answer
Explanation: When the operating system uses HALT instruction on a processor which supports multithreading, the operation moves from multi tasking mode to single tasking mode.
10. The Xeon TM processor on which hyperthreading technology was first implemented consists of
a) one logical processor per physical processor
b) two logical processor per physical processor
c) three logical processor per physical processor
d) zero logical processor per physical processor
View Answer
Explanation: The Xeon TM processor on which hyperthreading technology was first implemented consists of two logical processor per physical processor.
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