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One sided communication is certainly one route. Another mechanism you could use to tackle this is use non-blocking two-sided communication, things like MPI_ISend and MPI_IRecv. If you fix some MPI process, you could set it up to have two main tasks: Process requests from other processes asking for array data local to this process When this process gets a ...

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The basic model of MPI is "two-sided communication": you have a sender who knows where to send, and a receiver who knows from where to expect something. In your description that is not the case: the sender sends to a randomly generated receiver. You could do this with one-sided communication in MPI which will be a bit of a learning curve. There the ...

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MPI is designed so that the same executable is started on a number of machines, none of which may be the one on which the mpirun program is called. Furthermore, MPI jobs are typically put into a queue, and the actual job may run hours or days later. As a consequence, MPI jobs are not meant to be used in an interactive mode, but all input should be provided ...

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Input from the console may work on process zero, if that runs locally, but will certainly not work on other ranks. However, I wouldn't even do interactive input on process zero. #!/bin/bash if [ $PMI_RANK -eq 0 ] ; then ( echo 5 ; echo 1 ; echo foo ) |$* else exec \$* fi Put that in a script and start that with mpirun: mpirun myscript.sh myprogram ...

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