If set, LSF binds a job that is not explicitly associated with an HP-UX pset to the default pset 0. If LSB_PSET_BIND_DEFAULT is not set, LSF must still attach the job to a pset, and so binds the job to the same pset used by the LSF HPC daemons.
Use LSB_PSET_BIND_DEFAULT to improve LSF daemon performance by automatically unbinding a job with no pset options from the pset used by the LSF daemons, and binding it to the default pset.