fork() on mosix cluster

[willie]

Hi there,

I want to evaluate a function f(X) for different inputs Xi in parallel,
i.e. find Yi=f(Xi) for all the Xi that I am interested in. I have access
to a mosix cluster, and want to use the fork() function to start the
different processes, but sometimes (not always) I get "panic:
Segmentation fault -- stopping myself..."

The simple code that I used to test the process is included. Can anyone
please tell me where is the problem in my code? The cluster has GNU
Octave, version 2.1.36 (i686-pc-linux-gnu) installed.

Thank you
Willie Smit

CODE:
w=rand(10,10);

for i=1:2
 [file_ids,err,msg]=pipe();
 [pid, msg]=fork()

 pread(i)=nth(file_ids(1),1);
 pwrite(i)=nth(file_ids(2),1);

 if(pid>0)
  pidc(i)=pid
  'parent'
 elseif(pid==0)
  'child'
  for m=1:size(w,1)
   for n=1:size(w,2)
    if(w(m,n)>0.95)
     st=strcat(num2str(m),' ',num2str(n),'\n');
     fputs(pwrite(i),st);
    end
   end
  end
  fputs(pwrite(i),'eof\n');
  'child done'
  exit
 end
end

for i=1:2
 data=fgets(pread(i))
 while(strcmp(data,'eof\n')==0)
  data=fgets(pread(i))
 end
 fclose(pwrite(i))
 fclose(pread(i))
end






-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------