GNU xargs has also an option (-P) to run several processes in parallel. Something like... 
find /starting/dir -type f -print0 | xargs -P 4 -0 /.../perlscriptcall
+ingfortran.pl

[download]
... should work for the OP.

In reply to Re^2: Parallelization of heterogenous (runs itself Fortran executables) code by salva
in thread Parallelization of heterogenous (runs itself Fortran executables) code by Jochen

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