By default, newly created processes only belong to the primary
group for the user ID as defined on the spawning node.
To add a process to all groups a user belongs to on the
current node, enable this flag using the
supplementaryGroups directive or set the
configuration flag supplGrps in
parastation.conf to true.
Enabling this behavior may trigger extensive network traffic, depending on how the user authentication is configured on the nodes. E.g., using LDAP will open a connection to the LDAP server.
See also parastation.conf(5) and psiadmin(1) for more information.