Goal

Question 1

What is the goal of parallel processors?

Answer 1

Connecting multiple computers to get higher performance.

Question 2

What is a parallel processing program?

Answer 2

Single program runs in multiple computers.

Question 3

What is multicore microprocessors?

Answer 3

Chips with multiple processors.

Question 4

2 type of hardware. Name them:

Answer 4

Serial and parallel

Question 5

Two tyoes of software. Name them:

Answer 5

Sequential and concurrent

Question 6

Sequential runs on 1 whereas concurrent on 2

Answer 6

1 serial hardware
2 parallel

Question 7

SISD stands for:

Answer 7

Single instruction stream single data stream uniprocessor

Question 8

MIMD stands for:

Answer 8

Multiple instruction streams multiple data streamsmultiprocessor

Question 9

SPMD stands for:

Answer 9

Single program multiple data streams a single program runs accross multiple processors

Question 10

SIMD stands for:

Answer 10

Single instruction stream multiple data streams. The same instruction is applied to many data streams.

Question 11

Load/store in vector instructions:

Answer 11

lv/sv

Question 12

Add vectors of double:

Answer 12

addv.d

Question 13

Add scalar to each element of vector double:

Answer 13

addvs.d

Question 14

Vector processors reduce:

Answer 14

Instruction fetch bandwidth

Question 15

What are the advantages of vector architectures and compilers?

Answer 15

. Simplify data parallel programming
. Absence of loop
. Regular access patterns benefit from interleaved and burst memory
. Avoid control hazards

Question 16

Using a vector instruction indicates that the computation of each result in the vector is independent of the computation of other results.

Answer 16

True

Question 17

Vector architectures are better than MIMD multiprocessors

Answer 17

True

Question 18

In vector hardware only checks for data hazards between 2 instructions once per vector operand not once for every element

Answer 18

True

Question 19

The cost of the latency to main memory is seen only once for the entire vector

Answer 19

True

Question 20

SIMD other benefits:

Answer 20

All processors execute the same instruction at the same time, simplifies synchronization

Question 21

Difference between vector and multimedia extensions:

Answer 21

Vector have a variable vector width while multimedia have fixed width

Question 22

What are the various multithreading techniques?

Answer 22

Fine grain multithreading
Coarse grain multithreading and simultaneous multithreading

Question 23

Fine grain multithreading:

Answer 23

. Switch threads after each cycle
. Interleave instruction execution
. If one thread stalls others are executed

Question 24

Coarse grain multithreading:

Answer 24

Only switch in long stall and simplifies hardware

Question 25

Simultaneous multithreading:

Answer 25

. Schedule instructions from multiple threads
. Instructions from independent threads execute when function units are available
.Within threads dependences handled by scheduling

Question 26

SMP stands for:

Answer 26

Shared memory multiprocessor

Question 27

What does the SMP offer?

Answer 27

A single physical address space accross all processors as in multicore chips.