how to run two matlab scripts in parallel?

I need to run two scripts in parallel and simultaneously, run the first script and the second script at the same time.

[Hema sai sree]

funcs1 = {@fun1, @fun2} ;   % let fun1, fun2 be two functions 
arguments = {inp1,inp2 ;inp1,inp2} ;   % write the inputs of each function 
solutions = cell(1,2);                 % initialize the solution 
% use of parfor 
parfor ii = 1:2
    solutions1{ii}=funcs1{ii}(arguments1{ii,:});
end
M = solutions1{1} ; N = solutions1{2} ;   % assign the results

Answer 1

[KSSV]

You can use parfor to run two functions simultaneously. Eg:

funcs1 = {@fun1, @fun2} ;   % let fun1, fun2 be two functions 
arguments = {inp1,inp2 ;inp1,inp2} ;   % write the inputs of each function 
solutions = cell(1,2);                 % initialize the solution 
% use of parfor 
parfor ii = 1:2
      solutions1{ii}=funcs1{ii}(arguments1{ii,:});
end
M = solutions1{1} ; N = solutions1{2} ;   % assign the results

Answer 2

[José-Luis]

You could use parpool(). More flexible than parfor() but you'd need the parallel computing toolbox.

Another alternative is to start two sessions of Matlab and run the different scripts there.

[Walter Roberson]

parpool initializes conditions for running simultaneous workers, but does not in itself send any computation to the workers. parfor() and spmd() and parfeval() are some of the methods of submitting tasks to a parallel pool created with parpool.

[Hamza Ashraf]

hi am working on a project that requires running two tasks simultaneosuly.

task 1. %infinite while loop which constantly records audio data and detects for ambulance and stores result in a variable

task 2. % again infinite loop which is processing some images and gives output to arduino and switch traffic signals according to results

task 1 is independent. But task 2 requires data form task 1 so that it can gives output to arduino if an ambulance is detected and perform assigned action according to ambulance detection

can you help me how to do it

[Walter Roberson]

SPMD with labSend() and labReceive() is natural for that kind of work.

[Hamza Ashraf]

Can you explain it with code i dont know how to use spmd with labsend and lab receive

Answer 3

[Austin Bond]

should the 'arguments' and 'solutions' variables really be 'arguments1' and 'solutions1'?

[Walter Roberson]

Yes, KSSV made some typing mistakes.

Answer 4

[Sean de Wolski]

Just call batch directly or right-click on the script in the current folder browser and select "Run as batch job"

Answer 5

[MathWorks Support Team]

You can use Parallel Computing Toolbox to run two MATLAB functions simultaneously. (If you have scripts, then first wrap them up as functions as described here in the doc Create Functions in Files). The parfeval function allows you to run two functions simultaneously on a parallel pool. Each call to parfeval causes the specified function to be invoked on a worker with the provided inputs. You also need to specify up front how many outputs you want. Your code might end up like this:

numOut = 1; % Both functions here have only a single output

f1 = parfeval(@myFirstFunction, numOut, in1, in2); % request myFirstFunction(in1,in2)

f2 = parfeval(@mySecondFunction, numOut, in3); % request mySecondFunction(in3)

out1 = fetchOutputs(f1); % this waits for myFirstFunction to complete and then gets the result

out2 = fetchOutputs(f2);

If you need to process the results as soon as either function completes, you could use fetchNext instead of fetchOutputs.

[Walter Roberson]

These days, you can also use parfeval() and background threads without needing the Parallel Computing Toolbox; see backgroundPool