Batch sounds slower than interactive parallel jobs
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Hi !
I use Matlab 7.10.0 and Parallel Toolbox on a 8 cores blade.
Issuing that command :
tic;job=batch('birthdayscript','matlabpool',4);wait(job);ovrHead=toc;
I obtain ovrHead = 10.42 seconds
Issuing that command :
matlabpool open 4;tic;p = prunbirthday(2e4, 30), ovrHead=toc;matlabpool close
I obtain ovrHead = 1.39 seconds
May I ask you why batch method is so ineffective ?
Sylvain
PS : here the code of birthdayscript :
numtrials = 2e4;
groupsize = 30;
% Preallocate some memory for the matches
matches = zeros(1, numtrials);
parfor trial = 1:numtrials
% Run a simulation for a group
matches(trial) = birthday(groupsize);
end
% Probability is the sum of matches divided by number of trials
prob = sum(matches)/numtrials;
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Sean de Wolski
2013년 7월 9일
편집: Sean de Wolski
2013년 7월 9일
batch is opening its own MATLAB pool of four workers so this is included in the timing of the first snippet and not the second.
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