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Hostgroups are 'named groups' of hosts configured by
the sysadmin, and can be specified in place of hostnames just about
anywhere in rush submit scripts, or on the rush command line.
Hostgroup names always start with a '+', and all hostgroup memberships
can be seen in 'rush -lah' reports. For instance,
'+any' is a hostgroup that includes ALL hosts.
Hostgroups are free-form names defined by agreement between TDs and
sysadmins. The '+any' hostgroup always represents 'all hosts'.
Hostgroups are used like hostnames, and always start with a '+' character,
as in:
cpus +soft@100
nevercpus +neverhosts
All hosts on the network should be a member of the special host
group name '+any'. So if a TD specifies '+any=10@500',
this indicates the job wants to use any 10 available cpus at a priority
of 500, taking into account limitations set by the submit script's
criteria and neverhosts commands.
For example, if the resource manager creates a hostgroup called
+badlands, adding several hosts as members of that group,
then TD's can put in their submit script:
...to inherit all hosts configured in the +badlands hostgroup
at a priority of 100.
Hostgroups can be specified in the following submit script commands:
Hostgroups can be viewed with 'rush -lah', or by
clicking the 'All Hosts' button in irush.
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