Hello, I am wondering whether light oversubscription could lead to a clobbered program. The particular case is a fortran 77 (for the most part) code I am working with that can only run on powers of 2 processes (starting with power 1). When I run the program on my single-processor laptop, it shows some erratic behavior, namely the fortran system calls that create directories and rename files, etc. do not work after some point in the program. I only use -np 2 and the hostfile is
'hostname' slots=1 max_slots=1 Changing the dimension of some larger arrays in the program do affect the point where the system calls do not work. The status of the mpi calls is normal; no errors reported. I am using gfortran 4.3.2 and ompi-1.3.2 The program runs normally on my workstation with 4 processors with the same compiler/ompi versions. Thanks for any inputs. -- Valmor
