Dear all, I was fairly running quantum espresso on the ubuntu 18.04 with the command
mpiexec -n 4 ./pw.x < scf.in > out.out on my 4 core pc. Now when I have upgrade my pc to ubuntu 20.04, and when I run the quantum espresso with the same command, it gives me error. haider@HAIDER:~/qe-6.5/bin$ mpiexec -n 4 ./pw.x <scf.in> out.out & [1] 32761 haider@HAIDER:~/qe-6.5/bin$ -------------------------------------------------------------------------- There are not enough slots available in the system to satisfy the 4 slots that were requested by the application: ./pw.x Either request fewer slots for your application, or make more slots available for use. A "slot" is the Open MPI term for an allocatable unit where we can launch a process. The number of slots available are defined by the environment in which Open MPI processes are run: 1. Hostfile, via "slots=N" clauses (N defaults to number of processor cores if not provided) 2. The --host command line parameter, via a ":N" suffix on the hostname (N defaults to 1 if not provided) 3. Resource manager (e.g., SLURM, PBS/Torque, LSF, etc.) 4. If none of a hostfile, the --host command line parameter, or an RM is present, Open MPI defaults to the number of processor cores In all the above cases, if you want Open MPI to default to the number of hardware threads instead of the number of processor cores, use the --use-hwthread-cpus option. Alternatively, you can use the --oversubscribe option to ignore the number of available slots when deciding the number of processes to launch. -------------------------------------------------------------------------- [1]+ Exit 1 mpiexec -n 4 ./pw.x < scf.in > out.out I have reinstall quantum espresso, but received the same error. I sought your help. with regards Haider Abbas
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