Memory needs for --with-mpi-pr jobs

[liz.deco...@gmail.com]

Quick and easy, I promise!

If I'm using molpro with GA compiled with `--with-mpi-pr`, how much memory should I leave free for the helper process? 300 MW is what I know is suggested per-process for molpro standard, plus however much memory the job needs per-process, but does the helper process also need that same footprint?

[qia...@theochem.uni-stuttgart.de]

There is no explicit memory allocation from the Molpro side with this process. We expect that the (local) memory usage of this process negligible compared to the memory used by Molpro on the worker processes in typical calculations. That said, the GA library is probably using this process to allocate the GAs (in the form of POSIX shared memory).

[liz.deco...@gmail.com]

Yes, yes, so I should probably leave space on the machine for the GA alloc, but I don't need to leave a ton of space for the helper process *itself* inherently.

Thank you very much!