Execute functions and read input simultaneously in Matlab
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I have an mp3 file which needs to go through different functions (blocks) in series. The input of each block is taken from the output of the previous block. Block C needs the longest time to process (eg. 10s). The problem is, instead of waiting the 10s, I wish to read another frame of mp3 while waiting the block C to finish its process. Any idea on the solution?
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Answers (2)
Walter Roberson
on 3 Nov 2018
Edited: Walter Roberson
on 25 Nov 2018
If you have the parallel computing toolbox then you can use spmd.
framesize = 4096;
P = parpool(4);
spmd
if labindex == 1
end
end
spmd
if labindex == 1
afr = dsp.AudioFileReader(Filename, 'SamplesPerFrame', framesize);
while ~isDone(afr)
frame = step(afr);
labSend(frame, 2);
end
labSend([], 2)
release(afr)
elseif labindex == 2
while true
frame = labReceive(1);
if isempty(frame)
labSend([], 3)
break
end
Bres = BlockB(frame);
labSend(Bres, 3);
end
elseif labindex == 3
while true
Bres = labReceive(2);
if isempty(Bres)
labSend([], 4)
break
end
Cres = BlockC(Bres) ;
labSend(Cres, 4)
end
else
while true
Cres = labReceive(3);
if isempty(Cres)
break
end
Dres = BlockD(Cres) ;
end
end
11 Comments
Walter Roberson
on 21 Feb 2019
No. Job scheduler is only needed if you are using the Distributed Computing Toolbox, which would be for running computing on a cluster. Job schedulers are not required for running only on the resources of the local computer.
Star Rats
on 10 Apr 2019
Hi Walter, is your answer above considered as Task parallel (Embarrassingly Parallel) or Data parallel (Fine Grained Parallel) ?
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