Multithreading with N thread
9 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
How I can create N threads that run specific function parallely? I don't matter if it's slower than single thread and I don't matter if I'm adding a lot overhead, but I need that N instaces of function will be runned "potentially parallely". For exemple if I have 8 thread I would that all 8 functions associated to thread will be execute concurrently and I could have that first thread is at 20% of progress and the second thread at 17% of progress and so on for all threads that i want to create! I report this simple test code that I'm trying to execute:
n = 8;
input = cell(1,n);
for i = 1:n
input{i} = {i};
end
cluster = parcluster;
cluster.NumThreads = n;
j = createJob(parcluster);
tasks = createTask(j, @run, 0, input);
submit(j)
wait(j)
function seed = run(seed)
disp('prova')
for index = 1:100
dlmwrite(sprintf('/tmp/Seed_%d_progress.txt', seed), index);
pause(0.4);
end
end
I hope I was clear in my spiegation
3 comentarios
Respuestas (1)
OCDER
el 23 de Jun. de 2018
Editada: OCDER
el 26 de Jun. de 2018
NEW ANSWER
Matlab has it own scheduler called Matlab job scheduler (MJS). This will handle all your job scheduling. If you want a custom job scheduler, you'll have to use a third party job scheduler. Read:
OLD ANSWER
parfor will execute each iteration in parallel depending on how many cores you haves. If you have a quad-core processor, you can only do 4 at a time.
parfor j = 1:8 %treat each "iteration" as each worker
Out{j} = runFun(Input{j}); %slice your inputs and outputs so each worker are independent of eachother
end
%NOTE! Do NOT label your function "run" as that is a built-in matlab function.
Now, if you want the progress bar for each worker though, that's a little bit tricky. There are workarounds to that as seen in the Mathwork File Exchange site.
13 comentarios
OCDER
el 26 de Jun. de 2018
Yup, that solution is correct. Create a job with N independent tasks to be run by W workers.
Ver también
Categorías
Más información sobre Startup and Shutdown en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!