[Users] Patch: Use only one thread if OMP_NUM_THREADS is not set

[Erik Schnetter]

Carpet: Use only one thread if OMP_NUM_THREADS is not set

Introduce a new value for the parameter Carpet::num_threads: when set to -2, and when the environment variable OMP_NUM_THREADS is not set, then only 1 thread is used instead of a system default.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>   http://www.cct.lsu.edu/~eschnett/


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