MatLab maxes out exactly one of my cores.
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I am doing a lot of lsqcurvefits (order of 10^9 datapoints about 20 per fit so thats 10^8 fits) and all data is loaded in memory. Matlab maxes out exactly one of my cores on every system I try this on (dual core at work, quadcore at home). Even if I use parfor in my loops. Everywhere on this forum people tell eachother that there must be some other bottleneck, but I just dont buy it. Especially after trying it out at home with really fast RAM. Why does MatLab exactly max out one core if CPU is not the bottleneck?
My code goes something like this:
%size(data)==[15000 20];
times = [1:20];
startvals = [1,1];
pre_al = zeros(15000, 1);
amps = pre_al;
exps = pre_al;
expdecayfun = @([amplitude, exponent], time) amplitude*exp(-time/exponent)
parfor i=1:15000
x = lsqcurvefit(expdecayfun, startvals, times, data(i,:));
amps(i) = x(1);
exps(i) = x(2);
end
4 Comments
Accepted Answer
Jan
on 26 Sep 2013
Without seeing any line of the code, guessing the reason cannot be reliable. Perhaps you start Matlab with a flag to run on one core only? Or your PARFOR loops run one instance only? Could you provide more details?
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