Platform LSF Reference Version 6.2

Host Section
Platform LSF Reference
354
Host Section
Description
Optional. Defines the hosts, host types, and host models used as server hosts, and
contains per-host configuration information. If this section is not configured, LSF uses
all hosts in the cluster (the hosts listed in
lsf.cluster.cluster_name) as server hosts.
Each host, host model or host type can be configured to:
◆ Limit the maximum number of jobs run in total
◆ Limit the maximum number of jobs run by each user
◆ Run jobs only under specific load conditions
◆ Run jobs only under specific time windows
The entries in a line for a host override the entries in a line for its model or type.
When you modify the cluster by adding or removing hosts, no changes are made to
lsb.hosts. This does not affect the default configuration, but if hosts, host models,
or host types are specified in this file, you should check this file whenever you make
changes to the cluster and update it manually if necessary.
Host Section Structure
The first line consists of keywords identifying the load indices that you wish to configure
on a per-host basis. The keyword HOST_NAME must be used; the others are optional.
Load indices not listed on the keyword line do not affect scheduling decisions.
Each subsequent line describes the configuration information for one host, host model
or host type. Each line must contain one entry for each keyword. Use empty parentheses
( ) or a dash (-) to specify the default value for an entry.
HOST_NAME
Required. Specify the name, model, or type of a host, or the keyword default.
host name
The name of a host defined in lsf.cluster.cluster_name. The official host name
returned by
gethostbyname(3).
host model
A host model defined in lsf.shared.
host type
A host type defined in lsf.shared.
default
The reserved host name default indicates all hosts in the cluster not otherwise
referenced in the section (by name or by listing its model or type).
CHKPNT
Description
If C, checkpoint copy is enabled. With checkpoint copy, all opened files are automatically
copied to the checkpoint directory by the operating system when a process is
checkpointed.
Example HOST_NAME CHKPNT
hostA C
Compatibility
Checkpoint copy is only supported on Cray systems.
Default
No checkpoint copy.