how to increase the number of workers to 32 for parfor loop

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I am trying to increase the number of workers (cores) for parfor loop in Matalb, but after running the code the number of cores was limited to 12
parfor (i=1:size(data,2),32)
filename=[surfacename,num2str(sub),var,num2str(file_no(i)),'.raw'];
fullname=fullfile(Dir,filename);
fid = fopen(fullname,'rb'); % rb = read binary
NN=N*10;
data2 = fread(fid,NN,'single');
fclose(fid);
start=8;
data2=data2(start:length(data2));
len=length(data2)/no_variables;
if opt==1 ||opt==6;
data(:,i)=data2(1:len);
elseif opt==2;
data(:,i)=data2(len+1:2*len);
elseif opt==3;
data(:,i)=data2(2*len+1:3*len);
elseif opt==4;
data(:,i)=data2(3*len+1:4*len);
elseif opt==5;
data(:,i)=data2(4*len+1:5*len);
elseif opt==7;
F = scatteredInterpolant(x,y,z,data2(1:len),'linear','linear');
data_int=F(xq,yq,zq);
data_int_2= reshape(data_int,[],1);
data(:,i)=data_int_2;
elseif opt==8;
F = scatteredInterpolant(x,y,z,data2(len+1:2*len),'linear','linear');
data_int=F(xq,yq,zq);
data_int_2= reshape(data_int,[],1);
data(:,i)=data_int_2;
elseif opt==9;
F = scatteredInterpolant(x,y,z,data2(2*len+1:3*len),'linear','linear');
data_int=F(xq,yq,zq);
data_int_2= reshape(data_int,[],1);
data(:,i)=data_int_2;
elseif opt==10;
F = scatteredInterpolant(x,y,z,data2(3*len+1:4*len),'linear','linear');
data_int=F(xq,yq,zq);
data_int_2= reshape(data_int,[],1);
data(:,i)=data_int_2;
elseif opt==11;
F = scatteredInterpolant(x,y,z,data2(4*len+1:5*len),'linear','linear');
data_int=F(xq,yq,zq);
data_int_2= reshape(data_int,[],1);
data(:,i)=data_int_2;
end
if mod(i,500) == 0
fprintf('flie read %d...\n',i);
tt=toc/60
end
name=[name,i];
end
The output showed that the number of workers are only 12.Is there any method to increase them?

Answers (1)

Raymond Norris
Raymond Norris on 10 Apr 2022
Are you explicitly calling parpool?
parpool(32);
Alternatively, you can change the default by going to the Parallel preferences and changing Preferred number of workers in a parallel pool

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R2020b

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