New answers tagged hpc
1
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 ...
1
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
...
1
I think the main use of it is abstraction and the advantages that come with it:
Applying a function to each element of an array comes up in many situations. Wrapping this pattern into a function raises the level of abstraction: you do not need to think in loops, your intent is probably clearer. If you are familiar with Python, comprehensions do this, as ...
1
Ed Bueler just wrote the perfect book for you: "PETSc for Partial Differential Equations: Numerical Solutions in C and Python"
https://epubs.siam.org/isbn/978-1-61197-630-4
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