[gomp] omp performance question

[François-Xavier Coudert]

> single threaded ( FCFLAGS=-O1) timings on x64_64, dual CPU (dual core
> each), gave:
> real    64m36.502s
> user    64m36.886s
> sys     0m0.040s
>
> same machine, OMP enabled  (FCFLAGS="-O1 -fopenmp"):
> real    67m16.611s
> user    112m22.885s
> sys     25m44.641s

What is OMP_NUM_THREADS set to?

FX