Distributing Arrays with parfor

Hi, I would like to know if it's possible to use Distributing Arrays with parfor loops.

Thanks in advance!

Here the code:

for n=1:1:fbdAct 
 indice=find(bdAnt(:,columnaID)==bdAct(n,columnaID)); 
 if(~isempty(indice)) 
  if((bdAnt(indice,columnaInc)>0) && (bdAct(n,columnaInc)==0)) 
   if(~isempty(acelerados)) 
    indiceAcel=find(acelerados(:,colAcID)==bdAct(n,columnaID)); 
    if(isempty(indiceAcel)) 
     newAcelerado=[bdAct(n,columnaID) tEspera]; 
     acelerados=vertcat(acelerados,newAcelerado); 
    end 
   else 
    acelerados=[bdAct(n,columnaID) tEspera]; 
   end 
   bDAcelerados=acelerados; 
 end 
end 
end

[Jan]

Please explain any details. Currently the best answer is: "It depends".

Answer 1

[Edric Ellis]

Distributed arrays are designed to be used with SPMD blocks, not PARFOR loops. In general, it is a mistake to use a distributed array within the body of a PARFOR loop. What are you trying to do?

[Javier]

Hi! First of all thanks for replying.

My aim is to parallelize a for loop. I have been traying it with parfor statement, but the issue is that in the for loop I have a matrix(this matrix is defined out the parfor loop) in which it might be added a row or not depend on a coditions, and with parfor loop I'm not able to do it due to the fact I always get a nondeterministic or temporary error , so having found out the distributed array I was wondering if I could use it.

Regards,Javier.

[Konrad Malkowski]

Javier,

Could you post a copy of your sequential code (for loop)? This would help in determining if there is a way to parallelize that loop using parfor.

[Javier]

It is,bdAnt and bdAct are both matrix of nx8, and acelerados is nx2

for n=1:1:fbdAct

indice=find(bdAnt(:,columnaID)==bdAct(n,columnaID));

if(~isempty(indice))

if((bdAnt(indice,columnaInc)>0) && (bdAct(n,columnaInc)==0))

if(~isempty(acelerados))

indiceAcel=find(acelerados(:,colAcID)==bdAct(n,columnaID));

if(isempty(indiceAcel))

newAcelerado=[bdAct(n,columnaID) tEspera];

acelerados=vertcat(acelerados,newAcelerado);

end

else

acelerados=[bdAct(n,columnaID) tEspera];

end

bDAcelerados=acelerados;

end

end

end

thanks