LSF Version 7.3 - Administering Platform LSF

Administering Platform LSF 283
Specifying Resource Requirements
About Resource Requirement Strings
Most LSF commands accept a -R res_req argument to specify resource
requirements. The exact behaviour depends on the command. For example,
specifying a resource requirement for the
lsload command displays the load levels
for all hosts that have the requested resources.
Specifying resource requirements for the
lsrun command causes LSF to select the
best host out of the set of hosts that have the requested resources.
A resource requirement string describes the resources a job needs. LSF uses
resource requirements to select hosts for remote execution and job execution.
Resource requirement string sections
◆ A selection section (select). The selection section specifies the criteria for
selecting hosts from the system.
◆ An ordering section (order). The ordering section indicates how the hosts that
meet the selection criteria should be sorted.
◆ A resource usage section (rusage). The resource usage section specifies the
expected resource consumption of the task.
◆ A job spanning section (span). The job spanning section indicates if a parallel
batch job should span across multiple hosts.
◆ A same resource section (same). The same section indicates that all processes
of a parallel job must run on the same type of host.
Which sections
apply
Depending on the command, one or more of these sections may apply. For example:
◆ bsub uses all sections
◆ lshosts only selects hosts, but does not order them
◆ lsload selects and orders hosts
◆ lsplace uses the information in select, order, and rusage sections to select
an appropriate host for a task
◆ lsloadadj uses the rusage section to determine how the load information
should be adjusted on a host
Syntax select[selection_string] order[order_string] rusage[usage_string
[, usage_string][|| usage_string] ...] span[span_string]
same[same_string]
With the bsub and bmod commands, and only with these commands, you can
specify multiple
-R order, same, rusage, and select sections. The bmod command
does not support the use of the
|| operator.
The square brackets must be typed as shown.
The section names are s
elect, order, rusage, span, and same. Sections that do not
apply for a command are ignored.
If no section name is given, then the entire string is treated as a selection string. The
select keyword may be omitted if the selection string is the first string in the
resource requirement.
Each section has a different syntax.