Advanced computer Architecture

timer Asked: Apr 13th, 2016

Question description


Problem 1: Loop Optimization (3*10=30) For the following code fragments; rst list all the data dependencies (5) and then rearrange the code to reduce the dependencies and identify regions of parallelism (5).

for i=1:n for j=1:m

A(i,j)=A(j-1,i+1)+S end


for i=1:n for j=1:m

A(i+1,j+1)=A(i,j)+A(i+1,j) end


for i=1:n for j=1:m

A(i,j)=A(i-1,j)+A(i+1,j)+A(i,j+1)+A(i,j-1) end


Problem 2: Branch Prediction (20)

          I am attaching the Diagram below             

The Figure represents a 2-bit predictor, that predicts whether a branch will be taken or not depending on the state. A (m; n) predictor is one where we consider the outcome of the last m branches to on an n-bit predictor to predict the next branch. Assume we are using a (1,2) predictor. We have two 2-bit predictors. Predictor 1 is used when the previous branch was executed and Predictor 2 is used when the previous branch is not executed. Based on this; what will be the accuracy of prediction for the following codes. Assume in the rst step we start from state "predict taken". Show all steps (2*10).



for i=1:5

if(a==T) fa=T;g


if(a==b) fa=F; b=T;g 




 for i=1:5

if(a==T) fa=F;g 

if(b==T)fb=F;g  if(a==b) 

fa=T; b=F;g 


Problem 3: Parallel Algorithm Design (50 points) Design and implement a parallel algorithm for nding the (i) maximum, (ii) standard deviation and (iii) mode of a given set of positive numbers. Submit the code and a table/graph listing the running time changes for 2,4,8,16,32 processors for set size 5K 10K and 20K. (3*13=39)

Show the steps for applying the parallel algorithms on this sequence: 8,24,4,32,128,64,12, 56, 48, 4 (11)

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