Add Tao command to set number of OpenMP threads

[ken-lauer]

Background / Changes

Supersedes #1356

On-the-fly configuration of OpenMP's number of threads can be helpful, without having to resort to environment variable changes.

• Moves s%com%omp_n_threads to s%global%n_threads and updates references (only one which was commented out)
  • s%com isn't something users typically modify with set or view with show, so I think this move is justified
  • (Do we need backward-compatibility for this?)
• Adds show global and pipe global support to show n_threads

Usage

So with the typical set syntax:

Tao> set global n_threads = 3
[MESSAGE | 2025-JAN-09 18:06:15] tao_set_openmp_n_threads:
    OpenMP active with number of threads: 3

[DavidSagan]

@ken-lauer This looks generally good. One thing that got overlooked is the case when the User sets n_threads in an init file. You need to modify the routine tao_init_global which is in tao_init_mod.f90 for this.

[ken-lauer]

@ken-lauer This looks generally good. One thing that got overlooked is the case when the User sets n_threads in an init file. You need to modify the routine tao_init_global which is in tao_init_mod.f90 for this.

Thanks - that led me to reinit tao which also resets globals. Fixed in f054de7.

There are some code paths where it may get set multiple times in a row. I switched the message to then instead only show when n_threads was changed.