"make multi" and "mpirun"?
Posted: Thu Aug 29, 2013 10:58 pm
Dear All:
Maybe it is a dumb question... But I'm eager to see the answer:
when compiling Abinit, it needs #make multi_nprocs=N,
when running Abinit, it needs mpiexec or mpirun, which needs to specify the number of cores, say M.
Does the two have to be the same value (N==M)? Or they are simply irrelevant issues?
Thank you very much for clarification!!
-L
Maybe it is a dumb question... But I'm eager to see the answer:
when compiling Abinit, it needs #make multi_nprocs=N,
when running Abinit, it needs mpiexec or mpirun, which needs to specify the number of cores, say M.
Does the two have to be the same value (N==M)? Or they are simply irrelevant issues?
Thank you very much for clarification!!
-L
No correlation between N and M ... N defines the number of parallel tasks to compile (some parts of) Abinit i.e. how many concurrent fortran/link/... are invoked, and M is the number of cores invoked at runtime. In other words Abinit executable doesn't "remember" N to manage parallelization at runtime.