% Plot performances for MPI Heat3D %

% Loading input file
x=load('performances.txt');
% Get runtimes and number of processes
for i=1:3
   runTime(1:7,i)=(x((i-1)*7+1:i*7,3));
end 
% Sequential time for each size
timeSeq(1:3)=runTime(1,1:3);
% Compute speedup values
for i=1:3
   speedUp(1:6,i)=timeSeq(i)./runTime(2:7,i);
end
% Define histogram parameters
y=[2 4 8 16 32 64];
figure(1);
h=bar(log2(y),speedUp(1:6,1:3),'b'); % get histogram
set(gca,'Xlim',[0 7]);
set(gca,'YLimMode','Auto');
set(gca,'xticklabel',{'2','4','8','16','32','64'});
set(h(1),'facecolor','b'); % use color name
set(h(2),'facecolor','r'); % or use RGB triple
set(h(3),'facecolor','g'); % or use a color defined in the help for plot
hPatch=findobj(h,'Type','patch');
set(hPatch,'facealpha',0.4);
% Define legend and labels
h=legend('N=64^3','N=128^3','N=256^3');
rect=[0.75,0.77,0.11,0.11];
set(h,'Position',rect,'color','none');
hPatch=findobj(h,'Type','patch');
set(hPatch,'facealpha',0.4);
xlabel('Number of Processes');
ylabel('SpeedUp');
title('Benchmark : SpeedUp vs Number of Processes');