Platform LSF Reference Version 6.2

HostPartition Section
Platform LSF Reference
362
HostPartition Section
Description
Optional; used with host partition user-based fairshare scheduling. Defines a host
partition, which defines a user-based fairshare policy at the host level.
Configure multiple sections to define multiple partitions.
The members of a host partition form a host group with the same name as the host
partition.
Limitations on Queue Configuration
◆ If you configure a host partition, you cannot configure fairshare at the queue level.
◆ If a queue uses a host that belongs to a host partition, it should not use any hosts
that don’t belong to that partition. All the hosts in the queue should belong to the
same partition. Otherwise, you might notice unpredictable scheduling behavior:
❖ Jobs in the queue sometimes may be dispatched to the host partition even
though hosts not belonging to any host partition have a lighter load.
❖ If some hosts belong to one host partition and some hosts belong to another,
only the priorities of one host partition are used when dispatching a parallel job
to hosts from more than one host partition.
Shared Resources and Host Partitions
◆ If a resource is shared among hosts included in host partitions and hosts that are
not included in any host partition, jobs in queues that use the host partitions will
always get the shared resource first, regardless of queue priority.
◆ If a resource is shared among host partitions, jobs in queues that use the host
partitions listed first in the
HostPartition section of lsb.hosts will always
have priority to get the shared resource first. To allocate shared resources among
host partitions, LSF considers host partitions in the order they are listed in
lsb.hosts.
Structure
Each host partition always consists of 3 lines, defining the name of the partition, the
hosts included in the partition, and the user share assignments.
HPART_NAME
Syntax
HPART_NAME=
partition_name
Description
Specifies the name of the partition.
HOSTS
Syntax
HOSTS=
[[~]host_name | [~]host_group | all]...
Description
Specifies the hosts in the partition, in a space-separated list.
A host cannot belong to multiple partitions.
A host group cannot be empty.