title: Communicate between separate MPI-Programs
body: <p>I have the following problem:</p>
  
  <p>Program 1 has a huge amount of data, say 10GB. The data in question consists of large integer- and double-arrays. 
  Program 2 has 1..n MPI processes that use tiles of this data to compute results.</p>
  
  <p>How can I send the data from program 1 to the MPI Processes?</p>
  
  <p>Using File I/O is out of question. The compute node has sufficient RAM.</p>