--> FOAM FATAL IO ERROR: 
file "system/decomposeParDict" does not exist

file: system/decomposeParDict at line 1.

    From function Foam::IFstream& Foam::IFstream::operator()() const
    in file db/IOstreams/Fstreams/IFstream.C at line 176.           

FOAM exiting

@andy This is problem when case doesn't have default decomposeParDict The usage of -np xxx and -decomposeParDict yyy leads to success in running the job. However call to this function leads to failure. e.g. ``` --> FOAM FATAL IO ERROR: file "system/decomposeParDict" does not exist file: system/decomposeParDict at line 1. From function Foam::IFstream& Foam::IFstream::operator()() const in file db/IOstreams/Fstreams/IFstream.C at line 176. FOAM exiting ```

You'll have to adapt the Allrun script accordingly. The code cannot predict what the name of the decomposeParDict is. Fancy adding an optional -decomposeParDict argument to getNumberOfProcessors()?